WO2012089013A1

WO2012089013A1 - Domain name system caching method, authorized domain name server and caching domain name server

Info

Publication number: WO2012089013A1
Application number: PCT/CN2011/083913
Authority: WO
Inventors: 张德文
Original assignee: 华为技术有限公司
Priority date: 2010-12-29
Filing date: 2011-12-14
Publication date: 2012-07-05
Also published as: CN102137174B; CN102137174A

Abstract

Disclosed is a method for updating domain name system cache, the method comprises: obtaining a second parsing result of a domain name requesting parsing when detecting the content server corresponding to a first domain name parsing result in the cache has encountered a fault or the load of the server has exceeded a threshold, the domain name requesting parsing corresponds to the first parsing result of the domain name, the content server corresponding to the second parsing result of the domain name operates normally; and sending a domain name parsing update message to the caching domain name server corresponding to the domain name requesting parsing, wherein the domain name parsing update message carries the domain name requesting parsing, and the domain name parsing update message is used for instructing the caching domain name server to update the cached first parsing result of the domain name to the second parsing result of the domain name. The embodiments of the present invention allows the caching domain name server to return the correct domain name parsing result to a terminal, and the terminal requests contents from a content server operating normally according to the domain name parsing result.

Description

The domain name system cache method, the authorized domain name server, and the cached domain name server. The application is submitted to the Chinese Patent Office on December 29, 2010, and the application number is 201010612278.6. The invention name is "domain name system cache method, authorized domain name server, cache domain name server". The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of information technology, and in particular, to a method for updating a domain name system cache, an authorized domain name server, and a cached domain name server.

Background technique

The Domain Name System (DNS) is a distributed host information database that uses a client/server model, which mainly includes a cached domain name server and an authorized domain name server. The authorized domain name server stores the correspondence between the domain name and the Internet Protocol (IP) address in the network. The authorized domain name server can resolve the domain name to the corresponding IP address.

In the existing domain name resolution process, the terminal sends a domain name resolution request to the cached domain name server, where the domain name resolution request carries the domain name that the terminal requests to resolve. The cached domain name server sends a domain name resolution request to the authorized domain name server. The domain name resolution server performs domain name resolution according to the domain name resolution request, obtains the domain name resolution result, and sends a domain name resolution response to the cache domain name server. The domain name resolution response includes the domain name resolution result, and the domain name resolution result includes the IP address of the content server and the analysis result. Time To Live (TTL). The cached domain name server sends the domain name resolution result to the terminal.

After receiving the domain name resolution response, the cached domain name server caches the domain name resolution result according to the time-to-live. After receiving the domain name resolution request for parsing the same domain name, the cached domain name server directly sends the cached domain name resolution result to the terminal. . After the TTL expires, the cached domain name server deletes the domain name resolution result from the cache.

If the content server corresponding to the domain name fails in the domain name resolution result, the cached domain name server still returns the address of the failed content server based on the domain name resolution request, so that the terminal requests the content from the faulty content server according to the domain name resolution result. When the content request fails. Summary of the invention

The embodiment of the present invention provides a method for updating a domain name system cache, and an authorized domain name server and a cached domain name server, so as to delete the domain name resolution result on the cached domain name server in time after the content server is faulty, to prevent the terminal from sending a request to the faulty content server. .

In order to solve the above technical problem, the embodiment of the present invention is implemented by the following technical solutions: The method for updating the domain name system cache provided by the embodiment of the present invention includes:

If the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, the second domain name resolution result of the domain name that is requested to be resolved is obtained, and the domain name and the first domain name that are requested to be resolved are obtained. Corresponding to the analysis result, the working state of the content server corresponding to the second domain name resolution result is normal;

Sending a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be parsed, where the domain name resolution update message carries the domain name of the request resolution, and the domain name resolution update message is used to indicate that the cached domain name server is to be cached. The first domain name resolution result is updated to the second domain name resolution result.

The embodiment of the invention further provides a method for updating a domain name system cache, including:

When the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, the domain name resolution result deletion message is generated, and the domain name resolution result deletion message is used to delete the first in the cache domain name server. The domain name resolution result, the domain name resolution result deletion message carries the domain name requested for resolution, and the domain name of the request resolution corresponds to the first domain name resolution result;

Sending the domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, and the cached domain name server corresponds to the domain name of the request resolution.

Receiving a domain name resolution update message sent by the authorized domain name server, where the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, where the domain name resolution update message carries the request Resolved domain name;

And updating the first domain name resolution result in the cache to the second domain name resolution result, where the first domain name resolution result corresponds to the domain name of the request resolution.

The embodiment of the invention further provides a method for updating a domain name system cache, including: And receiving the domain name resolution result deletion message sent by the authorized domain name server, where the domain name resolution result deletion message carries the domain name of the request resolution, and the domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cache domain name server, The first domain name resolution result corresponds to the domain name of the request resolution;

The first domain name resolution result corresponding to the domain name that is requested to be resolved in the cache is deleted. An embodiment of the present invention further provides an authorized domain name server, including:

The parsing result obtaining unit is configured to obtain a second domain name parsing result of the domain name requested to be parsed when the content server corresponding to the first domain name parsing result in the self cache is faulty or the load exceeds a threshold, and the request is parsed The domain name is corresponding to the first domain name resolution result, and the working state of the content server corresponding to the second domain name resolution result is normal;

An update message sending unit, configured to send a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be parsed, where the domain name resolution update message carries the domain name that is requested to be parsed, and the domain name resolution update message is used to indicate The cached domain name server updates the cached first domain name resolution result to the second domain name resolution result.

An embodiment of the present invention further provides an authorized domain name server, including

And a message generating unit, configured to: when detecting that the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds a threshold, generating a domain name resolution result deletion message, where the domain name resolution result deletion message is used for deleting The first domain name resolution result carried in the cached domain name server, where the domain name resolution result deletion message carries the domain name requested for resolution, and the domain name to be resolved corresponds to the first domain name resolution result;

a message sending unit, configured to send the domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes a first domain name resolution result in the cache, the cached domain name server, and the request resolution The domain name corresponds.

The embodiment of the invention further provides a cached domain name server, including:

An update message receiving unit, configured to receive a domain name resolution update message sent by the authorized domain name server, where the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, The domain name resolution update message carries the domain name requested for resolution;

The second update unit is configured to update the first domain name resolution result in the cache to the second domain name resolution result, where the first domain name resolution result corresponds to the domain name requested to be resolved.

The embodiment of the invention further provides a cached domain name server, including: The deletion message receiving unit is configured to receive a domain name resolution result deletion message sent by the authorized domain name server, where the domain name resolution result deletion message carries the domain name requested to be resolved, and the domain name resolution result deletion message is used to delete the number carried in the cache domain name server. a domain name resolution result, where the first domain name resolution result corresponds to the domain name of the request resolution;

The deletion execution unit is configured to delete the first domain name resolution result corresponding to the domain name of the request resolution in the cache.

The method for updating the domain name system cache provided in the embodiment of the present invention may be applied to a scenario in which the content server corresponding to the first domain name resolution result is faulty or the load exceeds a threshold, and the embodiment of the present invention sends the domain name resolution update to the cached domain name server. The message causes the cached domain name server to delete the first domain name resolution result of the cache to be the second domain name resolution result or delete the cached first domain name resolution result, so as to avoid returning the wrong first domain name resolution result to the terminal. The embodiment of the present invention may enable the cached domain name server to return the second domain name resolution result to the terminal after receiving the domain name resolution request of the terminal, and the content server corresponding to the second domain name resolution result is working normally, and the terminal may be in a normal working state. The content server requests content.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a flowchart of a method for updating a domain name system cache according to a first embodiment of the present invention; FIG. 2 is a flowchart of a method for a domain name server to send a domain name resolution update message to a cached domain name server corresponding to a domain name requested to be resolved by the domain name server according to the first embodiment of the present invention; Figure

3 is a flowchart of a method for updating a cache of a domain name system according to Embodiment 2 of the present invention; FIG. 4 is a flowchart of a method for updating a cache of a domain name system according to Embodiment 3 of the present invention; FIG. 5 is an authorization of Embodiment 3 of the present invention; A flowchart of a method for the domain name server to perform a domain name resolution result deletion message to the cache name server;

6 is a flowchart of a method for updating a domain name system cache according to Embodiment 4 of the present invention; FIG. 7 is a flowchart of a method for updating a domain name system cache according to Embodiment 5 of the present invention; FIG. 8 is a cache domain name according to Embodiment 5 of the present invention; The server updates the first domain name resolution result in the cache to a flowchart of the second domain name resolution result; 9 is a flowchart of a method for updating a domain name system cache provided by Embodiment 6 of the present invention; FIG. 10 is a flowchart of a first domain name resolution result corresponding to a domain name requested to be resolved by a cached domain name server in a cache of a sixth embodiment of the present invention; flow chart;

11 is an application scenario diagram of a method for updating a domain name system cache provided by Embodiment 7 of the present invention;

FIG. 12 is a schematic structural diagram of an authorized domain name server according to Embodiment 8 of the present invention; FIG. 13 is a schematic structural diagram of an authorized domain name server according to Embodiment 9 of the present invention; FIG. 14 is an update message in an authorized domain name server according to Embodiment 9 of the present invention; Schematic diagram of the sending unit;

15 is a schematic structural diagram of an authorized domain name server according to Embodiment 10 of the present invention; FIG. 16 is a schematic structural diagram of a deletion message sending unit in an authorized domain name server according to Embodiment 10 of the present invention;

FIG. 17 is a schematic structural diagram of an authorized domain name server according to Embodiment 11 of the present invention; FIG. 18 is a schematic structural diagram of a cached domain name server according to Embodiment 12 of the present invention; FIG. 19 is a cached domain name server according to Embodiment 12 of the present invention; A schematic diagram of the structure of the second update unit;

FIG. 20 is a schematic structural diagram of a cached domain name server according to Embodiment 13 of the present invention; FIG. 21 is a schematic diagram of a structure of a delete execution unit in a cached domain name server according to Embodiment 13 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The present invention provides a method for updating a domain name system cache, an authorized domain name server, and a cached domain name server. In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, FIG. 1 is a flowchart of a method for updating a domain name system cache according to Embodiment 1 of the present invention. The method for updating the domain name system cache provided by the first embodiment of the present invention includes:

If the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, the second domain name resolution result of the domain name that is requested to be resolved is obtained, and the domain name and the first domain name resolution of the request are resolved. Correspondingly, the working state of the content server corresponding to the second domain name resolution result is normal.

Specifically, the first domain name resolution result is cached in the authorized domain name server, and the authorized domain name server obtains the second domain name of the domain name that is requested to be resolved when detecting that the content server corresponding to the first domain name resolution result is faulty or the load exceeds the threshold. Analyze the results.

The domain name to be parsed corresponds to the first domain name resolution result, and the content server corresponding to the second domain name resolution result is normal. The normal working status of the content server can be understood as that the content server does not currently fail, and the content service can be normally provided for the user terminal. In addition, the threshold of the load of the content server can be flexibly determined according to actual conditions.

A2. The domain name resolution update message is sent to the cached domain name server corresponding to the domain name that is requested to be parsed. The domain name resolution update message carries the domain name of the request resolution, and the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result. Parse the result for the second domain name.

Specifically, after obtaining the second domain name resolution result, the authorized domain name server sends a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be resolved.

The authorized domain name server can obtain the address of the corresponding cached domain name server according to the correspondence between the domain name that is requested to be resolved and the cached domain name server. The cache corresponding to the domain name requested for resolution The domain name server has sent a domain name resolution request to the authorized domain name server for the domain name.

It should be noted that the domain name requested to be parsed may correspond to multiple cached domain name servers, that is, multiple cached domain name servers corresponding to the domain name resolved by the same request may receive the domain name resolution update message.

The cached domain name server updates the first domain name resolution result in the cache to the second domain name resolution result, and after receiving the domain name resolution request, the cached second domain name resolution result is sent to the terminal, so that the terminal sends the second domain name to the second domain name. The content server requesting the inner valley corresponding to the parsing result.

The method for updating the domain name system cache provided in the embodiment of the present invention may be applied to a scenario in which the content server corresponding to the first domain name resolution result is faulty or the load exceeds a threshold, and the embodiment of the present invention sends the domain name resolution update to the cached domain name server. Message, making the cached domain name service The result of deleting the first domain name resolution of the cache is the second domain name resolution result, and avoids returning the wrong first domain name resolution result to the terminal. After receiving the domain name resolution request of the terminal, the cached domain name server returns the second domain name resolution result to the terminal, and the content server corresponding to the second domain name resolution result is in a normal working state, and the terminal may request content from the content server with normal working status.

Referring to FIG. 2, the step of the domain name server in the first embodiment of the present invention for the domain name server to perform the domain name resolution update message corresponding to the domain name server corresponding to the domain name that is requested to be resolved may include:

Bl. Find the address of the cached domain name server corresponding to the domain name requested to be resolved in the cache according to the pre-saved correspondence.

Specifically, the authorized domain name server searches for the address of the cached domain name server corresponding to the domain name requested to be resolved according to the pre-stored correspondence, that is, the correspondence between the domain name to be parsed and the cached domain name server, and obtains the cached domain name. The IP address of the server.

B2. Send a domain name resolution update message to the cached domain name server that is found.

Specifically, the authorized domain name server sends a domain name resolution update message to the cached domain name server according to the IP address of the cached domain name server, so that the cached domain name server that receives the update message deletes the cached domain name resolution result.

Further, the domain name resolution update message provided by the embodiment of the present invention further includes cache update indication information and a second domain name resolution result. The cache update indication information is used to instruct the cached domain name server to update the cached first domain name resolution result to the second domain name resolution result. After receiving the domain name resolution update message, the cached domain name server deletes the first domain name resolution result cached by itself according to the update indication information. Referring to FIG. 3, FIG. 3 is a flow chart of a method for updating a domain name system cache according to Embodiment 2 of the present invention.

In the embodiment of the present invention, the terminal sends a domain name resolution request to the cached domain name server, where the domain name resolution request carries the domain name that the terminal requests to resolve. The cached domain name server sends a domain name resolution request to the authorized domain name server.

The method for updating the domain name system cache provided by the second embodiment of the present invention may include:

Cl, receiving a domain name resolution request sent by the cache name server, and the domain name resolution request includes a domain name requested to be resolved.

Specifically, the authorized domain name server receives the domain name resolution request sent by the cached domain name server, and the domain name resolution request includes the domain name requested for resolution. C2. Parse the domain name that is requested to be parsed according to the received domain name resolution request, and obtain the first domain name resolution result.

Specifically, the authorized domain name server parses the domain name of the request for parsing according to the received domain name resolution request, and obtains the first domain name resolution result. The first domain name resolution result includes the address of the content server corresponding to the domain name and the lifetime of the first domain name resolution result. In the embodiment of the present invention, the lifetime of the first domain name resolution result is referred to as a first lifetime.

C3. Cache a correspondence between the first domain name resolution result and the domain name requested to be resolved, and a correspondence between the domain name requested to be resolved and the cache domain name server, and send a domain name resolution response to the cache domain name server, where the domain name resolution response includes The first domain name resolution result and the domain name requested to be resolved.

Specifically, the authorized domain name server caches the correspondence between the first domain name resolution result and the domain name requested to be resolved, the domain name requested to be resolved, and the cache domain name server. The time for authorizing the domain name server to cache the corresponding relationship may be flexibly determined according to requirements, for example, in seconds or hours.

The authorized domain name server also sends a domain name resolution response to the cached domain name server according to the domain name resolution request. The domain name resolution response includes the first domain name resolution result and the domain name requested to be resolved.

After receiving the domain name resolution response, the cached domain name server sends the first domain name resolution result to the corresponding terminal, so that the terminal can access the corresponding content server according to the first domain name resolution result.

C4. After detecting that the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, obtaining the second domain name resolution result of the domain name requested for resolution, the domain name and the first domain name resolution result of the request resolution Correspondingly, the working state of the content server corresponding to the second domain name resolution result is normal.

In the embodiment of the present invention, after the domain name resolution response is sent to the corresponding cached domain name server, if the content server corresponding to the first domain name resolution result is subsequently detected to be faulty or the load exceeds the threshold, the authorized domain name server authenticates the domain name server. The domain name that is requested to be parsed is again subjected to domain name resolution, and the second domain name resolution result of the domain name requested for resolution is obtained, and the current working state of the content server corresponding to the second domain name resolution result is normal.

C5. Send a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be parsed. The domain name resolution update message carries the domain name of the request resolution, and the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result. Analyze the second domain name fruit.

The authorized domain name server can obtain the address of the corresponding cached domain name server according to the correspondence between the domain name that is requested to be resolved and the cached domain name server. The cache corresponding to the domain name requested for resolution The domain name server has sent a domain name resolution request to the authorized domain name server for the domain name. It should be noted that the domain name for requesting resolution may correspond to multiple cached domain name servers, that is, multiple cached domain name servers corresponding to the domain name resolved by the same request may receive the domain name resolution update message.

In the embodiment of the present invention, the domain name resolution update message sent by the authorized domain name server carries the domain name for request resolution, and the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result.

Further, in the second embodiment of the present invention, after the first lifetime of the first domain name resolution timeout expires, the first domain name resolution result in the cache and the address of the cache domain name server are automatically deleted, which not only saves the cache space, but also can save the cache space. Improve the performance of authorized domain name servers.

The method for updating the domain name system cache provided by the second embodiment of the present invention may further perform the following steps:

C6. Update the first domain name resolution result in the cache to the second domain name resolution result. Specifically, the authorized domain name server may further update the first domain name resolution result in the cache to the second domain name resolution result after obtaining the second domain name resolution result corresponding to the domain name requested to be resolved.

It should be noted that the order of execution between the foregoing steps C5 and C6 is slot-independent, and the sequential execution order does not limit the embodiment of the present invention.

In the method for updating the domain name system cache provided by the first and second embodiments of the present invention, the authorized domain name server detects that the content server corresponding to the domain name resolution result is faulty, and may adopt the following manner:

1) Upon receiving the fault report message sent by the content server corresponding to the domain name resolution result, it is determined that the content server is faulty.

Specifically, the authorized domain name server receives the content service corresponding to the first domain name resolution result. If the fault report message is sent by the device, it is determined that the content server is faulty.

2) The status message sent by the content server corresponding to the domain name resolution result is not received within the preset time, and the content server is determined to be faulty.

Specifically, if the authorized domain name server does not receive the status report message sent by the content server corresponding to the first domain name resolution result within the preset time, it is determined that the content server is faulty. The preset time can be determined according to a specific content server.

It should be pointed out that only two possible state acquisition methods are given above, and the authorization domain name server can learn whether the content server is faulty or not. Referring to FIG. 4, FIG. 4 is a flow chart of a method for updating a domain name system cache according to Embodiment 3 of the present invention.

The method for updating the domain name system cache provided by the third embodiment of the present invention mainly includes:

If the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, the domain name resolution result deletion message is generated, and the domain name resolution result deletion message is used to delete the cached cached domain name server. As a result of the first domain name resolution, the domain name resolution result deletion message carries the domain name requested for resolution, and the first domain name resolution result corresponds to the domain name requested to be resolved.

Specifically, the authorized domain name server caches the first domain name resolution result, and the authorized domain name server generates a domain name resolution result deletion message when the content server corresponding to the first domain name resolution result is faulty or the load exceeds the threshold, and the domain name resolution result is generated. The delete message is used to delete the first domain name resolution result cached in the cached domain name server. The domain name resolution result deletion message carries the domain name requested for resolution, and the cached first domain name resolution result and the domain name requested to be resolved have a corresponding relationship.

D2: Send a domain name resolution result deletion message to the cache domain name server, so that the cache domain name server deletes the first domain name resolution result in the cache, and the cache domain name server corresponds to the domain name requested to be parsed.

Specifically, after the domain name resolution result deletion message is generated, the authorized domain name server sends the message to the cached domain name server corresponding to the domain name that is requested to be analyzed. It should be noted that the domain name requested for resolution can correspond to multiple cached domain name servers.

After receiving the domain name resolution result deletion message, the cached domain name server deletes the first domain name resolution result corresponding to the domain name requested for resolution in the cache. Cache domain name server is deleting After the first domain name resolution result is obtained in the cache, the domain name resolution result can be requested again from the authorized domain name server after receiving the domain name resolution request, and the correct domain name resolution result is obtained.

The method for updating the domain name system cache provided by the embodiment of the present invention may be applied to a scenario in which the content server corresponding to the first domain name resolution result is faulty or the load is higher than a preset threshold, and the embodiment of the present invention sends the domain name resolution to the cached domain name server. As a result, the message is deleted, so that the cached domain name server deletes the cached first domain name resolution result, and avoids returning the wrong first domain name resolution result to the terminal. After receiving the domain name resolution request of the terminal, the cached domain name server re-requests the correct domain name resolution result to the authorized domain name server, and sends the correct domain name resolution result to the cached domain name server, so that the terminal can request the content from the correct content server.

Referring to FIG. 5, in the third embodiment of the present invention, the step of the domain name server performing the domain name resolution result deletion message sent to the cache domain name server (step D2) may specifically include:

El searches for the address of the cached domain name server corresponding to the domain name requested to be resolved in the cache according to the pre-saved correspondence.

Specifically, the authorized domain name server searches and searches in the cache according to the pre-stored correspondence, that is, the correspondence between the first domain name resolution result and the domain name requested to be resolved, the domain name requested to be resolved, and the cached domain name server. The address of the cached domain name server corresponding to the first domain name resolution result, and the IP address of the cached domain name server is obtained.

E2. Send a domain name resolution result deletion message to the found cached domain name server.

Specifically, the authorized domain name server sends a domain name result deletion message to the cached domain name server that is found according to the IP address of the cached domain name server, so that the cached domain name server that receives the deleted message deletes the first cached domain name corresponding to the domain name that is requested to be resolved. Domain name resolution results. Referring to FIG. 6, FIG. 6 is a flow chart of a method for updating a domain name system cache according to Embodiment 4 of the present invention.

In the embodiment of the present invention, the terminal sends a domain name resolution request to the cached domain name server, where the domain name resolution request carries the domain name requested for resolution. The cached domain name server sends a domain name resolution request to the authorized domain name server.

The method for updating the domain name system cache provided by the fourth embodiment of the present invention may include:

Fl. Receive a domain name resolution request sent by a cached domain name server, where the domain name resolution request includes a domain name requested to be resolved.

Specifically, the authorized domain name server receives the domain name resolution request sent by the cached domain name server, The domain name resolution request includes the domain name requested to be resolved.

F2. Parse the domain name that is requested to be parsed according to the domain name resolution request, and obtain the first domain name parsing result.

F3. Cache a correspondence between the first domain name resolution result and the domain name requested to be resolved, and a correspondence between the domain name requested to be resolved and the cached domain name server, and send a domain name resolution response to the cache domain name server, where the domain name resolution response is It includes the first domain name resolution result and the domain name requested for resolution.

Specifically, the authorized domain name server caches the correspondence between the first domain name resolution result and the domain name requested to be resolved, the domain name requested to be resolved, and the cache domain name server that sends the domain name resolution request. The time at which the authorized domain name server caches the corresponding relationship may be flexibly determined according to needs, for example, in seconds or hours. When the content server corresponding to the domain name resolution result in the cache is faulty, the embodiment of the present invention obtains the address of the corresponding cached domain name server according to the cached correspondence, so as to update the cached domain name server. The cached domain name resolution result.

After receiving the domain name resolution response, the cached domain name server sends the first domain name resolution result to the corresponding terminal, and the terminal accesses the corresponding content server according to the first domain name resolution result.

If the content server corresponding to the first domain name resolution result is faulty or the load exceeds the threshold, the domain name resolution result deletion message is generated, and the domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cache domain name server. The domain name resolution result deletion message carries the domain name requested for resolution, and the first domain name resolution result corresponds to the domain name requested to be resolved.

The domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cached domain name server. The domain name resolution result deletion message carries the domain name of the request resolution, and there is a correspondence between the cached first domain name resolution result and the domain name requested to be resolved.

F5. Send a domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, the cached domain name server and the request The domain name corresponding to the parsing is required.

Specifically, after the domain name resolution result deletion message is generated, the authorized domain name server sends the message to the cached domain name server corresponding to the domain name that is requested to be resolved. It should be noted that the domain name requested for resolution may correspond to multiple cached domain name servers, and the authorized domain name server may send a domain name resolution result deletion message to multiple cached domain name servers, thereby causing multiple cached domain name servers to delete the first domain name resolution in the cache. result.

After receiving the domain name resolution result deletion message, the cached domain name server deletes the first domain name resolution result corresponding to the domain name requested for resolution in the cache. After deleting the first domain name resolution result in the cache, the cached domain name server may request the domain name resolution result from the authorized domain name server after receiving the domain name resolution request for the request, and obtain the correct domain name resolution result.

In the method for updating the domain name system cache provided by the third and fourth embodiments of the present invention, the authorized domain name server detects that the content server corresponding to the domain name resolution result is faulty, and may adopt the following manner:

Specifically, the authorized domain name server receives the fault report message sent by the content server corresponding to the first domain name resolution result, and determines that the content server is faulty.

It should be pointed out that only two possible acquisition methods are given above, and the authorization domain name server can learn whether the content server is faulty or not.

The method for updating the system cache provided by the embodiment of the present invention is described above from the side of the authorized domain name server. The method for updating the system cache provided by the embodiment of the present invention is described below from the domain name cache server side. Referring to FIG. 7, FIG. 7 is a flow chart of a method for updating a domain name system cache according to Embodiment 5 of the present invention.

In the fifth embodiment of the present invention, the cache of the cached domain name server includes request parsing. The domain name and the first domain name resolution result corresponding to the domain name. The authorized domain name server sends a domain name resolution update message to the cached domain name server when it is required to delete the domain name resolution result cached in the cached domain name service, for example, if the content server corresponding to the first domain name resolution result is faulty or the load is higher than the preset threshold. . The method for updating the domain name system cache provided by the fifth embodiment of the present invention may include:

Gl. Receive a domain name resolution update message sent by the authorized domain name server, where the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, where the domain name resolution update message carries the request resolution domain name.

Specifically, the cache domain name server receives the domain name resolution update message sent by the authorized domain name server, and the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, and the domain name resolution update message is carried in the domain name resolution update message. The domain name requested to be resolved.

The cached domain name server can find the first domain name resolution result that needs to be updated according to the domain name parsed by the request in its own cache.

G2: The first domain name resolution result in the cache is updated to the second domain name resolution result, and the first domain name resolution result corresponds to the domain name requested to be resolved.

Specifically, the cached domain name server updates the first domain name resolution result corresponding to the domain name to be resolved in the cache to the second domain name resolution result according to the update indication information.

In the embodiment of the present invention, the cached domain name server updates the first domain name resolution result corresponding to the domain name that is requested to be parsed in the cache to the second domain name resolution result, and may analyze the updated domain name after receiving the domain name resolution request. As a result, the second domain name resolution result is sent to the terminal. Compared with the prior art, the embodiment of the present invention can prevent the terminal from requesting content from the failed content server by deleting the domain name resolution result in the self cache, and further causes the terminal to request content from the currently available content server.

Further, the second domain name resolution result cached in the cached domain name server further includes a time-to-live, and the survival time of the second domain name resolution result is referred to as a second time-to-live time in the embodiment of the present invention.

G3. After the second survival time expires, the second domain name resolution result in the cache is deleted. By deleting the second domain name resolution result that exceeds the lifetime, the embodiment of the present invention can not only save the cached resource of the cached domain name server, but also enable the terminal to obtain a newer domain name resolution result.

Referring to FIG. 8, in the fifth embodiment of the present invention, the cached domain name server caches the first domain name in its own cache. The process of updating the parsing result to the second domain name parsing result (the above step G2) may be: H1. Searching, in the cache, the first domain name parsing result corresponding to the domain name requested for parsing according to the pre-stored correspondence.

Specifically, the cached domain name server searches for the first domain name resolution result corresponding to the domain name to be resolved in the cache according to the pre-stored correspondence, that is, the correspondence between the domain name to be resolved and the first domain name resolution result.

The cache domain name server pre-stores the correspondence between the domain name for request resolution and the first domain name resolution result. After receiving the domain name resolution response sent by the authorized domain name server, the cached domain name server pre-stores the correspondence between the first domain name resolution result in the domain name resolution response and the domain name resolved by the request.

H2: Update the first domain name resolution result that is found to the second domain name resolution result.

Specifically, the cached domain name server updates the first domain name resolution result found to the second domain name resolution result.

Referring to FIG. 9, FIG. 9 is a flow chart of a method for updating a domain name system cache according to Embodiment 6 of the present invention.

In the sixth embodiment of the present invention, the cache of the cached domain name server includes the domain name to be resolved and the first domain name resolution result corresponding to the domain name. When the domain name resolution server caches the domain name resolution result of the cached domain name server, for example, if the content server corresponding to the first domain name resolution result is faulty or the load is higher than the preset threshold, the domain name resolution result is sent to the cached domain name server. Delete the message. The method for updating the domain name system cache provided by the sixth embodiment of the present invention may include:

The domain name resolution result deletion message sent by the authorized domain name server is received, and the domain name resolution result deletion message carries the domain name of the request resolution, and the domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cache domain name server, A domain name resolution result corresponds to the domain name requested to be resolved.

Specifically, the cached domain name server receives the domain name resolution result deletion message sent by the authorized domain name server, and the domain name resolution result deletion message carries the domain name of the request resolution, and the domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cache domain name server. The first domain name resolution result corresponds to the domain name requested to be resolved.

J2: Delete the first domain name resolution result corresponding to the domain name requested for resolution in the cache. Specifically, the cached domain name server deletes the information from the cache according to the domain name resolution result deletion information. The first domain name resolution result corresponding to the domain name requested to be resolved.

In the embodiment of the present invention, if the content server corresponding to the first domain name resolution result is faulty or the load exceeds a preset threshold, the cached domain name server deletes the first domain name resolution result corresponding to the domain name resolved by the request in the cache. After receiving the domain name resolution request, it is determined that the corresponding domain name resolution result does not exist in the cache, and the domain name resolution result is requested again from the authorized domain name server, that is, the domain name resolution request is sent to the authorized domain name server, and the updated domain name resolution is obtained from the authorized domain name server. As a result, the cached domain name server sends the updated domain name resolution result to the corresponding terminal.

Compared with the prior art, the embodiment of the present invention can avoid sending an address of a content server that has a fault or a load exceeding a threshold to the terminal, and can prevent the terminal from requesting content from a content server that has a fault or a load exceeding a threshold. The content server available to request content.

Further, in the method for updating the domain name system cache provided by the sixth embodiment of the present invention, the step of deleting the first domain name resolution result corresponding to the domain name requested to be resolved in the cache name server by the cache domain name server (step J2) may be performed by parsing the request The lifetime of the first domain name resolution corresponding to the domain name is changed to 0, and the first lifetime is changed to 0. The cached domain name server automatically deletes the first domain name resolution result.

Referring to FIG. 10, in the sixth embodiment of the present invention, the cache domain name server deletes the first domain name resolution result corresponding to the domain name that is requested to be resolved in the cache (step F2), which may be:

Ll. Search for the first domain name resolution result corresponding to the domain name requested to be resolved in the cache according to the pre-saved correspondence.

L2. Delete the first domain name resolution result that is found.

Specifically, the cached domain name server deletes the first domain name resolution result that is found.

The method for updating the domain name system cache provided by the embodiment of the present invention is described in detail above. For a more detailed understanding of the embodiments of the present invention, a specific application scenario of the method for updating the cache of the domain name system in the embodiment of the present invention is given below. Referring to FIG. 11, FIG. 11 is an application scenario diagram of a method for updating a domain name system cache according to Embodiment 7 of the present invention.

In this embodiment, a content provider (domain name www.abc.com) deploys two content servers Server1 and Server2 in a certain area, and the authorized domain name server is responsible for managing the status of Server1 and Server2, and Serverl and Server2 are working normally. The status report message is sent to the authorized name server periodically. Local DNS is the cached domain name server in the area, and there are some user terminals in the area, such as UE1 and UE2.

The method for updating the domain name system cache provided by the seventh embodiment of the present invention mainly includes:

The SI and Local DNS receive the domain name resolution request sent by UE1.

In the seventh embodiment of the present invention, the domain name resolution request sent by the UE1 carries the domain name of the request resolution www.abc.com and the address of the terminal.

52. Local DNS sends a domain name resolution request to the authorized domain name server.

Specifically, when the local DNS does not cache the domain name resolution result corresponding to the domain name www.abc.com, the local DNS sends a domain name resolution request to the authorized domain name server, where the domain name resolution request carries the domain name www.abc.com and the cached domain name. The address of the server. The address of the cache domain name server may be the IP address of the cached domain name server.

53. The authorized domain name server performs domain name resolution according to the domain name resolution request, and obtains the first domain name parsing result.

Specifically, the authorized domain name server may search for the first domain name resolution result corresponding to the domain name that is requested to be resolved, and the first domain name resolution result includes the address of the content server. In the embodiment of the present invention, when the server 1 is working properly, that is, the content service can be provided for the user terminal, the first domain name resolution result includes the address ipl of the server1 and the lifetime of the first domain name resolution result.

54. The authorized domain name server caches the correspondence between the first domain name resolution result and the domain name requested to be resolved, the correspondence between the local DNS address and the domain name requested to be resolved, and sends a domain name resolution response to the Local DNS.

Specifically, the authorized domain name server sends a domain name resolution response to the local DNS according to the received domain name resolution request, and the domain name resolution response carries the first domain name resolution result.

The authorized domain name server caches the first domain name resolution result and the domain name requested to be resolved by itself. Correspondence between the corresponding relationship, the domain name requested to be resolved, and the cached domain name server requesting domain name resolution. In the embodiment of the present invention, the correspondence between the domain name server www.abc.com and the local DNS address and the correspondence between the domain name www.abc.com and the first domain name resolution result are authorized by the domain name server.

55. Authorize the domain name server to send a domain name resolution response to the Local DNS.

Specifically, the authorized domain name server sends a domain name resolution response to the local DNS according to the domain name resolution request, where the first domain name resolution result is carried.

56. The local DNS receives the domain name resolution response, and caches the first domain name resolution result.

The local DNS sends a domain name resolution response to the UE1, which carries the first domain name resolution result.

58. The UE1 requests content from the content server Server 1 according to the first domain name resolution result. On the S9-S10, the authorized domain name server detects that the server 1 is faulty and obtains the second domain name resolution result.

Specifically, the authorized domain name server receives the fault report message sent by the server 1, or fails to receive the status report message of the server 1 in the preset time period, and then determines that the server 1 is faulty, and obtains the second domain name resolution result. In the embodiment of the present invention, the authorized domain name server does not receive the fault report message sent by the server 2 or receives the status report message sent by the server 2 within the preset time, and then determines that the status of the server 2 is normal, and obtains the IP address of the server 2. . The second domain name resolution result includes the IP address of server 2 and the second lifetime.

S11. The authorized domain name server updates the first domain name resolution result corresponding to www.abc.com in the cache to the second domain name resolution result.

In the seventh embodiment of the present invention, the domain name server is authorized to search for the first domain name resolution result corresponding to www.abc.com in the cache, and the first domain name resolution result is updated to the second domain name resolution result, which specifically includes the first domain name resolution result. The address of Server1 is updated to the address of Server 2, and the lifetime of the first domain name resolution result (ie, the first lifetime) is updated to the lifetime of the second domain name resolution result (ie, the second lifetime).

S12. The authorized domain name server sends a domain name resolution update message to the local DNS, and the domain name resolution update message includes cache update indication information, a second domain name resolution result, and a domain name www.abc.com.

Specifically, the domain name resolution update message may be a new message type in the embodiment of the present invention, where the message includes cache update indication information, a second domain name resolution result, and a domain name www.abc.com. The second domain name resolution result includes the address of the server 2 and the lifetime of the address of the server 2 (second lifetime).

513. The local DNS receives the domain name resolution update message, and updates the first domain name resolution result corresponding to the server1 in the cache to the second domain name resolution result.

In the embodiment of the present invention, the local DNS updates the first domain name resolution result corresponding to the domain name www.abc.com in the cache to the second domain name resolution result. The update process specifically includes updating the address of Server1 in the first domain name resolution result to the address of Server 2, and updating the lifetime of the first domain name resolution result (that is, the first lifetime) to the survival time of the second domain name resolution result. (ie the second survival time).

After receiving the domain name resolution update message, the local DNS can also authenticate the validity of the update message. For example, the IP address of the sender is authenticated, and is consistent with the source IP address of the last domain name resolution response. The authorized domain name server can also carry the authentication code generated according to a certain key. The key and the encryption algorithm used can be returned to the Local DNS in advance in the domain name resolution response message. After receiving the domain name resolution update message, the local DNS recalculates the authentication code according to the previously obtained password and encryption algorithm, and determines whether the received authentication code and the calculated authentication code are consistent. If they are consistent, the authentication is passed, and the domain name is updated according to the domain name. The indication information in the message deletes the first domain name resolution result of the cache.

The embodiment of the present invention can enhance the security of the domain name system by increasing the legality authentication of the domain name resolution update message.

In the seventh embodiment of the present invention, UE2 may request domain name resolution from Local DNS.

514. The Local DNS receives the domain name resolution request sent by the UE2.

In the embodiment of the present invention, the domain name resolution request sent by the UE2 carries the domain name www.abc.com requested for resolution.

S15. The local DNS obtains the parsing result of the domain name in its own cache, and returns a domain name resolution response to the UE2, where the address of the server 2 is carried.

The local DNS searches for the domain name resolution result corresponding to the domain name www.abc.com in the cache. In the embodiment of the present invention, the second domain name resolution result includes the address of the server 2.

S16. The UE2 requests content from the content server Server 2 according to the second domain name parsing result. In the embodiment of the present invention, the working state of the server is normal, and the UE2 can request the required content from the server 2. In the embodiment of the present invention, the local DNS and the authorized domain name server delete the domain name resolution result in the cache after the TTL expires. After the local DNS deletes the domain name resolution result, if the domain name resolution request is received again, the domain name resolution result is not generated in the cache, and the domain name resolution request is sent to the authorized domain name server, and the authorized domain name server performs domain name resolution according to the domain name resolution request. , returns the result of domain name resolution, and caches the results of domain name resolution. After receiving the domain name resolution result, the local DNS caches the domain name resolution result locally, and returns the domain name resolution result to the requested user terminal.

The method for updating the domain name system cache provided by the seventh embodiment of the present invention can update the result of the domain name resolution cached on the Local DNS on the basis of the original TTL mechanism, so as to avoid the terminal requesting the content service failure or the service delay.

The method for updating the domain name system cache provided by the embodiment of the present invention is described in detail above. Referring to FIG. 12, FIG. 12 is a schematic structural diagram of an authorized domain name server according to Embodiment 8 of the present invention.

The authorized domain name server provided in Embodiment 8 of the present invention includes:

The parsing result obtaining unit 110 is configured to obtain a second domain name parsing result of the domain name requested to be parsed when the content server corresponding to the first domain name parsing result in the self cache is faulty or the load exceeds a threshold, and the request parsing is performed. The domain name is corresponding to the first domain name resolution result, and the working state of the content server corresponding to the second domain name resolution result is normal;

The update message sending unit 120 is configured to send a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be parsed, where the domain name resolution update message carries the domain name requested for resolution, and the domain name resolution update message is used to indicate that the cached domain name server is to be cached. The first domain name resolution result is updated to the second domain name resolution result.

The authorization domain name server provided in Embodiment 8 of the present invention can be used in the foregoing Embodiment 1 of the method for updating the domain name system cache. For details, refer to the description of Embodiment 1 above. The authorized domain name server provided by the embodiment of the present invention sends a domain name resolution update message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result of the cached domain name as the second domain name resolution result, and avoids returning the wrong first domain name resolution to the terminal. result. After receiving the domain name resolution request of the terminal, the cached domain name server returns a second domain name resolution result to the terminal, and The content server corresponding to the second domain name resolution result is in a normal working state, and the terminal may request content from the content server with a normal working state.

The authorized domain name server provided in the eighth embodiment of the present invention may further include:

The first update unit 130 is configured to update the first domain name resolution result in the cache to the second domain name resolution result after the parsing result obtaining unit 110 obtains the second domain name resolution result of the domain name requested to be parsed. Referring to FIG. 13, FIG. 13 is a schematic structural diagram of an authorized domain name server according to Embodiment 9 of the present invention.

The authorized domain name server provided in Embodiment 9 of the present invention includes:

The first receiving unit 210 is configured to receive a domain name resolution request sent by the cached domain name server, where the domain name resolution request includes a domain name that is requested to be parsed;

The domain name resolution unit 220 is configured to parse the domain name that is requested to be parsed according to the domain name resolution request, and obtain the first domain name resolution result;

The cache unit 230 is configured to cache a correspondence between the first domain name resolution result and the domain name requested to be resolved, and a correspondence between the domain name requested to be resolved and the cache domain name server. The parsing response sending unit 240 is configured to The cached domain name server sends a domain name resolution response, and the domain name resolution response includes the first domain name resolution result and the domain name of the request resolution. The analysis result obtaining unit 250 is configured to detect the content corresponding to the first domain name resolution result in the cache. If the server is faulty or the load exceeds the threshold, the second domain name resolution result of the domain name to be resolved is obtained, and the domain name to be resolved is corresponding to the first domain name resolution result, and the content server corresponding to the second domain name resolution result is working normally. ;

The update message sending unit 260 is configured to send a domain name resolution update message to the cached domain name server corresponding to the domain name that is requested to be parsed, where the domain name resolution update message carries the domain name of the request resolution, and the domain name resolution update message is used to indicate that the cached domain name server will The cached first domain name resolution result is updated to the second domain name resolution result.

The authorized domain name server provided in the ninth embodiment of the present invention can be used in the foregoing method 2 of the method for updating the domain name system cache. For details, refer to the description of the second embodiment.

Further, the authorized domain name server provided in Embodiment 9 of the present invention further includes: The first update unit 270 is configured to update the first domain name resolution result in the self cache to the second domain name resolution result after the parsing result obtaining unit 250 obtains the second domain name resolution result of the domain name requested to be parsed.

Referring to FIG. 14, FIG. 14 is a schematic structural diagram of an update message sending unit in an authorized domain name server according to Embodiment 9 of the present invention.

The update message sending unit 260 in the authorized domain name server provided in the ninth embodiment of the present invention may include:

The first searching module 261 is configured to search, in the cache, the address of the cached domain name server corresponding to the domain name requested to be parsed according to the pre-saved correspondence relationship;

The update message sending module 262 is configured to send a domain name resolution update message to the cached domain name server, where the domain name resolution update message carries the domain name requested for resolution, and the domain name resolution update message is used to indicate that the cached domain name server will cache the first The domain name resolution result is updated to the second domain name resolution result.

It should be noted that the specific structure of the update message sending unit 120 provided in the eighth embodiment of the present invention is the same as the specific structure of the update message sending unit 260 in the ninth embodiment, and will not be described in detail herein. Referring to FIG. 15, FIG. 15 is a schematic structural diagram of an authorized domain name server according to Embodiment 10 of the present invention. The authorized domain name server provided in Embodiment 10 of the present invention may include:

The deletion message generating unit 310 is configured to generate a domain name resolution result deletion message when the content server corresponding to the first domain name resolution result in the self-cache is faulty or the load exceeds a threshold, and the domain name resolution result deletion message is used for deleting The first domain name resolution result carried in the cached domain name server, where the domain name resolution result deletion message carries the domain name requested for resolution, and the domain name to be resolved corresponds to the first domain name resolution result;

The deletion message sending unit 320 is configured to send the domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, and the cached domain name server corresponds to the domain name of the request resolution. .

The authorization domain name server provided in the tenth embodiment of the present invention can be used in the foregoing third embodiment of the method for updating the domain name system cache. For details, refer to the description of the third embodiment. The authorized domain name server according to the embodiment of the present invention sends a domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the cached first domain name resolution result, and avoids The terminal returns the wrong first domain name resolution result. After receiving the domain name resolution request of the terminal, the cached domain name server re-requests the correct domain name resolution result to the authorized domain name server, and sends the correct domain name resolution result to the cached domain name server, so that the terminal can request the content from the correct content server.

Referring to FIG. 16, FIG. 16 is a schematic structural diagram of a deletion message sending unit in an authorized domain name server according to Embodiment 10 of the present invention.

The deletion message sending unit 320 in the authorized domain name server provided by the tenth embodiment of the present invention may specifically include:

The second searching module 321 is configured to search, in the cache, the address of the cached domain name server corresponding to the domain name requested to be parsed according to the pre-saved correspondence relationship;

The delete message sending module 322 is configured to send a domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, and the cached domain name server corresponds to the domain name requested to be resolved. Referring to FIG. 17, FIG. 17 is a schematic diagram showing the structure of an authorized domain name server according to Embodiment 11 of the present invention.

The authorized domain name server provided in Embodiment 11 of the present invention may include:

The first receiving unit 410 is configured to receive a domain name resolution request sent by the cached domain name server, where the domain name resolution request includes a domain name that is requested to be parsed;

The domain name resolution unit 420 is configured to parse the domain name that is requested to be parsed according to the domain name resolution request, and obtain the first domain name resolution result;

The cache unit 430 is configured to cache a correspondence between the first domain name resolution result and the domain name requested to be parsed, and a correspondence between the domain name requested to be resolved and the cache domain name server;

The analytic response sending unit 440 is configured to send a domain name resolution response to the cached domain name server, where the domain name resolution response includes the first domain name resolution result and the domain name of the request resolution.

The deletion message generating unit 450 is configured to generate a domain name resolution result deletion message when the content server corresponding to the first domain name resolution result in the self-cache is faulty or the load exceeds a threshold, and the domain name resolution result deletion message is used for deleting The first domain name resolution result carried in the cached domain name server, where the domain name resolution result deletion message carries the domain name requested for resolution, and the domain name to be resolved corresponds to the first domain name resolution result; The deletion message sending unit 460 is configured to send the domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, and the cached domain name server corresponds to the domain name requested to be resolved.

The authorization domain name server provided in the eleventh embodiment of the present invention can be used in the foregoing method 4 of the method for updating the domain name system cache. For details, refer to the description of the fourth embodiment.

It should be noted that the specific structure of the delete message sending unit 460 provided in the eleventh embodiment of the present invention is the same as the specific structure of the delete message sending unit 320 in the tenth embodiment, and will not be described in detail herein. Referring to FIG. 18, FIG. 18 is a schematic structural diagram of a cached domain name server according to Embodiment 12 of the present invention.

The cached domain name server provided in Embodiment 12 of the present invention includes:

The update message receiving unit 510 is configured to receive a domain name resolution update message sent by the authorized domain name server, where the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, and the domain name is Parsing the domain name carrying the request resolution in the update message;

The second update unit 520 is configured to update the first domain name resolution result in the self cache to the second domain name resolution result, where the first domain name resolution result corresponds to the domain name requested to be parsed.

The cached domain name server provided in Embodiment 12 of the present invention can be used in the foregoing Embodiment 5 of the method for updating the domain name system cache. For details, refer to the description of Embodiment 5 above. The cached domain name server provided by the embodiment of the present invention updates the first domain name resolution result corresponding to the domain name to be resolved in the cache to the second domain name resolution result, and may further analyze the updated domain name after receiving the domain name resolution request. As a result, the second domain name resolution result is sent to the terminal. Compared with the prior art, the embodiment of the present invention can prevent the terminal from requesting content from the failed content server by deleting the domain name resolution result in the self cache, and further causes the terminal to request content from the currently available content server.

Further, the cached domain name server provided in Embodiment 12 of the present invention may further include:

The timeout deleting unit 530 is configured to delete the second domain name resolution result in the self cache after the second timeout period expires. Referring to FIG. 19, FIG. 19 is a schematic structural diagram of a second update unit in a cached domain name server according to Embodiment 12 of the present invention.

The second update unit 520 in the cached domain name server provided in the twelfth embodiment of the present invention may include:

The third search module 521 is configured to search, in the cache, the first domain name resolution result corresponding to the domain name that is requested to be parsed according to the pre-stored correspondence relationship, where the first domain name resolution result corresponds to the domain name resolved by the request;

The cache update module 522 is configured to update the first domain name resolution result that is found to the second domain name resolution result. Referring to FIG. 20, FIG. 20 is a schematic structural diagram of a cached domain name server according to Embodiment 13 of the present invention.

The cached domain name server provided in Embodiment 13 of the present invention includes:

The deletion message receiving unit 610 is configured to receive a domain name resolution result deletion message sent by the authorized domain name server, where the domain name resolution result deletion message carries the domain name requested to be resolved, and the domain name resolution result deletion message is used to delete the first carried in the cache domain name server. The domain name resolution result, the first domain name resolution result corresponding to the domain name of the request resolution;

The deletion execution unit 620 is configured to delete the first domain name resolution result corresponding to the domain name requested for resolution in the cache.

The cached domain name server provided in the thirteenth embodiment of the present invention can be used in the foregoing sixth embodiment of the method for updating the domain name system cache. For details, refer to the description of the sixth embodiment. The cached domain name server provided by the embodiment of the present invention deletes the first domain name resolution result corresponding to the domain name resolved by the request in the cache, and then determines that the corresponding domain name resolution result does not exist in the cache after receiving the domain name resolution request. The domain name resolution request is sent to the authorized domain name server, and the domain name resolution request is sent to the authorized domain name server, and the updated domain name resolution result is obtained from the authorized domain name server, and the cached domain name server sends the updated domain name resolution result to the corresponding terminal. Compared with the prior art, the embodiment of the present invention can avoid sending an address of a content server that has a fault or a load exceeding a threshold to the terminal, and can prevent the terminal from requesting content from a content server that has a fault or a load exceeding a threshold. The content server available to request content. Referring to FIG. 21, FIG. 21 is a schematic structural diagram of a deletion execution unit in a cached domain name server according to Embodiment 13 of the present invention.

The deletion execution unit 620 in the cached domain name server provided in the thirteenth embodiment of the present invention may include:

The fourth search module 621 is configured to search, in the cache, the first domain name resolution result corresponding to the domain name requested to be parsed according to the pre-stored correspondence relationship;

The cache deletion module 622 is configured to delete the first domain name resolution result that is found.

It should be noted that the information exchange, the execution process, and the like between the cached domain name server and the authorized domain name server are based on the same concept as the method embodiment of the present invention. For details, refer to the description in the method embodiment of the present invention. , will not repeat them here.

A person skilled in the art can understand that all or part of the processes in the above embodiments are implemented by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. The flow of an embodiment of the methods as described above may be included. The storage medium can be a disk, a CD, or a read-only memory (Read-Only).

Memory, ROM) or Random Access Memory (RAM).

The method for updating the domain name system cache and the authorized domain name server and the cached domain name server provided by the embodiment of the present invention are described in detail. For those skilled in the art, according to the idea of the embodiment of the present invention, in the specific implementation manner and application scope There are variations, and the description should not be construed as limiting the invention.

Claims

Rights request

A method for updating a domain name system cache, comprising:

The method according to claim 1, wherein the detecting, before the content server corresponding to the first domain name resolution result in the cache is faulty or the load exceeds the threshold, the method further includes:

Receiving a domain name resolution request sent by the cached domain name server, where the domain name resolution request includes a domain name requested to be resolved;

Parsing the domain name that is parsed by the request according to the domain name resolution request, and obtaining a first domain name resolution result;

Cache a correspondence between the first domain name resolution result and the domain name that is requested to be resolved, and a correspondence between the domain name requested to be resolved and the cached domain name server, and send a domain name resolution response to the cached domain name server. The domain name resolution response includes the first domain name resolution result and the domain name of the request resolution.

The method according to claim 2, further comprising: after the obtaining the second domain name resolution result of the domain name that is requested to be parsed,

Updating the first domain name resolution result in the self cache to the second domain name resolution result.

The method according to claim 1, wherein the detecting that the content server corresponding to the first domain name resolution result in the cache is faulty comprises:

If the fault report message sent by the content server corresponding to the first domain name resolution result in the cache is received, or the status report message sent by the content server is not received within the preset time, the content server is determined to be faulty.

The method according to claim 1, wherein the sending the domain name resolution update message to the cached domain name server corresponding to the first domain name resolution result comprises:

Searching, in the cache, the address of the cached domain name server corresponding to the domain name that the request resolves according to the pre-saved correspondence;

Send a domain name resolution update message to the discovered cached domain name server.

6. A method according to any one of claims 1 to 5, characterized in that

The domain name resolution update message further includes cache update indication information and a second domain name resolution result, where the cache update indication information is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result.

7. A method for updating a domain name system cache, the method comprising:

The method according to claim 7, wherein before the detecting that the content server corresponding to the first domain name resolution result in the self cache fails or the load exceeds a threshold, the method further includes:

Cache a correspondence between the first domain name resolution result and the domain name that is requested to be resolved, and a correspondence between the domain name that is requested to be resolved and the cached domain name server, and send a domain name resolution response to the cached domain name server. The domain name resolution response includes the first domain name resolution result and the domain name of the request resolution.

The method according to claim 7, wherein the detecting that the content server corresponding to the first domain name resolution result in the cache is faulty comprises: If the fault report message sent by the content server corresponding to the first domain name resolution result in the cache is received, or the status report message sent by the content server is not received within the preset time, the content server is determined to be faulty.

The method according to claim 7, wherein the sending the domain name resolution result deletion message to the cached domain name server corresponding to the domain name that is requested to be parsed comprises:

Send a domain name resolution result deletion message to the found cached domain name server.

11. A method for updating a domain name system cache, the method comprising:

The method according to claim 11, wherein the second domain name resolution result further includes a second time to live, the method further comprising:

After the second survival time expires, the second domain name resolution result in the self cache is deleted.

The method according to claim 11, wherein the updating the first domain name resolution result in the self cache to the second domain name resolution result comprises:

Finding a first domain name resolution result corresponding to the domain name requested to be resolved in the cache according to the pre-saved correspondence relationship;

Updating the first domain name resolution result that is found to the second domain name resolution result.

14. A method for updating a cache of a domain name system, comprising:

And receiving the domain name resolution result deletion message sent by the authorized domain name server, where the domain name resolution result deletion message carries the domain name of the request resolution, and the domain name resolution result deletion message is used to delete the first domain name resolution result carried in the cache domain name server, The first domain name resolution result corresponds to the domain name of the request resolution;

The first domain name resolution result corresponding to the domain name that is requested to be resolved in the cache is deleted.

The method according to claim 14, wherein the deleting the first domain name resolution result corresponding to the domain name requested to be parsed in the self cache includes: Searching, in the cache, the first domain name resolution result corresponding to the domain name requested to be resolved according to the pre-stored correspondence relationship;

Delete the first domain name resolution result found.

16. An authorized domain name server, characterized by comprising:

The authorization domain name server according to claim 16, further comprising: a first receiving unit, configured to receive a domain name resolution request sent by the cached domain name server, where the domain name resolution request includes a domain name that is requested to be parsed;

a domain name resolution unit, configured to parse the domain name resolved by the request according to the domain name resolution request, and obtain a first domain name resolution result;

a cache unit, configured to cache a correspondence between the first domain name resolution result and the domain name of the request resolution, and a correspondence between the domain name requested to be resolved and the cached domain name server; and an analysis response sending unit, configured to The cached domain name server sends a domain name resolution response, and the domain name resolution response includes the first domain name resolution result and the domain name of the request resolution.

The authorized domain name server according to claim 16 or 17, further comprising:

The first update unit is configured to update the first domain name resolution result in the self cache to the second domain name resolution result after the parsing result obtaining unit obtains the second domain name resolution result of the domain name requested to be parsed.

The authorized domain name server according to claim 16, wherein the update message sending unit comprises:

a first search module, configured to search, in the cache, the cached domain name server corresponding to the domain name that is requested to be parsed according to the pre-saved correspondence relationship; An update message sending module, configured to send a domain name resolution update message to the cached domain name server, where the domain name resolution update message carries the domain name of the request resolution, and the domain name resolution update message is used to indicate that the cached domain name server will The cached first domain name resolution result is updated to the second domain name resolution result.

20. An authorized domain name server, characterized in that

The authorized domain name server according to claim 20, further comprising: a first receiving unit, configured to receive a domain name resolution request sent by the cached domain name server, where the domain name resolution request includes a domain name that is requested to be parsed;

The authorization domain name server according to claim 20, wherein the deletion message sending unit comprises:

a second searching module, configured to search, in the cache, the address of the cached domain name server corresponding to the domain name that is requested to be parsed according to the pre-saved correspondence relationship;

And a message sending module, configured to send a domain name resolution result deletion message to the cached domain name server, so that the cached domain name server deletes the first domain name resolution result in the cache, and the cached domain name server and the request parsing The domain name corresponds.

23. A cached domain name server, comprising: An update message receiving unit, configured to receive a domain name resolution update message sent by the authorized domain name server, where the domain name resolution update message is used to indicate that the cached domain name server updates the cached first domain name resolution result to the second domain name resolution result, The domain name resolution update message carries the domain name requested for resolution;

The cached domain name server according to claim 23, wherein the second domain name resolution result further includes a second lifetime, the cached domain name server further comprising:

The timeout deleting unit is configured to delete the second domain name resolution result in the self cache after the second timeout period expires.

The cached domain name server according to claim 23, wherein the second update unit comprises:

a third search module, configured to search, in the cache, the first domain name resolution result corresponding to the domain name that is requested to be resolved according to the pre-stored correspondence, where the first domain name resolution result corresponds to the domain name resolved by the request;

And a cache update module, configured to update the first domain name resolution result that is found to the second domain name resolution result.

26. A cached domain name server, comprising:

The deletion message receiving unit is configured to receive a domain name resolution result deletion message sent by the authorized domain name server, where the domain name resolution result deletion message carries the domain name requested to be resolved, and the domain name resolution result deletion message is used to delete the number carried in the cache domain name server. a domain name resolution result, where the first domain name resolution result corresponds to the domain name of the request resolution;

The cached domain name server according to claim 26, wherein the deletion execution unit comprises:

a fourth search module, configured to search, in the cache, the first domain name resolution result corresponding to the domain name that is requested to be resolved according to the pre-stored correspondence relationship;

The cache deletion module is configured to delete the first domain name resolution result that is found.