CN115297088A - System and method for domain name resolution in cloud computing environment - Google Patents

Abstract

The invention relates to the technical field of domain name resolution, and provides a domain name resolution system and a method in a cloud computing environment, wherein the system comprises the following components: the elastic cloud server comprises a plurality of client ESCs and is used for sending DNS request messages and receiving DNS response messages; the DNS server in the cloud environment consists of a cache module, a private network domain analysis module and an iteration module and is used for analyzing the DNS request message, sending a DNS response message to the client ESC after the DNS response message is successfully analyzed, and sending the DNS request message to the public DNS server after the DNS response message is failed to be analyzed; and the public DNS server is used for analyzing the DNS request message, caching the DNS response message to a cache module of the DNS server in the cloud environment after the DNS request message is successfully analyzed, and sending the DNS response message to the client ESC. According to the domain name resolution system and method in the cloud computing environment, the private network domain name and the public network domain name can be simultaneously resolved, the number of times of requests for the public DNS when the private network DNS server in the cloud resolves the public network domain name is reduced, and the resolution speed of the public network domain name by the DNS in the cloud is improved.

Description

Domain name resolution system and method in a cloud computing environment

technical field

The invention relates to the technical field of domain name resolution, in particular to a domain name resolution system and method in a cloud computing environment.

Background technique

A virtual private cloud (virtual private cloud, VPC) is a private network customized by the user in the cloud environment. An elastic cloud server (elastic compute service, ECS) is a virtual server created by the user in the VPC. The ECS will simultaneously access the public network and private network needs. The first step in accessing public and private networks is to send a request to the Domain Name System (DNS). DNS is a system on the Internet that maps domain names to IP addresses. After requesting the system, ECS will be notified of the IP address corresponding to the domain name. address, thereby initiating continued IP address access.

At present, the DNS request initiated by the ECS in the cloud computing environment will first reach the DNS service in the cloud environment. The DNS service in the cloud environment judges whether it is the authoritative DNS server of the domain (zone) where the domain name (record) is located. If so, then it will It will search the corresponding record in the zone database, and return the corresponding IP address if it is found, and return an error if it cannot be found; if not, the DNS request will be iteratively sent to the public DNS server for further analysis. The existing technology has the following shortcomings. When the DNS in the cloud environment considers itself to be the authoritative DNS server of the zone, and the record is not in the database of the DNS server in the cloud environment, but in the database of the public DNS server, the DNS request cannot be resolved normally. .

The reason for this deficiency is that in the current DNS system of cloud computing, on a resolution path (from inside the cloud environment to outside the cloud environment), the same domain can only belong to the DNS in the cloud environment or only to the public DNS. The DNS in the cloud environment means that the domain can be queried in the database of the DNS server in the cloud environment, so the domain can only be resolved in the cloud environment and cannot be resolved by the public DNS. At this time, if the customer has registered a large number of identical domains in the public DNS server records, the resolution of these records needs to be re-registered in the DNS in the cloud environment, which causes great inconvenience.

Therefore, how to use a method for DNS resolution in the cloud environment and public DNS resolution for the same domain has become an urgent problem in the field of cloud computing DNS.

Contents of the invention

In view of this, the present invention provides a domain name resolution system and method in a cloud computing environment.

On the one hand, the present invention provides a domain name resolution system in a cloud computing environment, comprising:

An elastic cloud server, including multiple client ESCs, is used to send DNS request packets and receive DNS response packets;

The DNS server in the cloud environment is composed of a cache module, a private network domain resolution module and an iteration module. It is used to resolve DNS request messages. After the resolution is successful, the DNS response message is sent to the client ESC. After the resolution fails, the DNS request message is sent to sent to a public DNS server;

The public DNS server is used to analyze the DNS request message. After the resolution is successful, the DNS response message is cached to the cache module of the DNS server in the cloud environment and sent to the client ESC.

Further, in the domain name resolution system in the cloud computing environment of the present invention, the caching module is used to cache the DNS response message of the DNS request message of the same domain name; The requested cached DNS response message record, when the cached DNS response message record exists, the cached DNS response message is sent to the client ECS; when the cached DNS response record does not exist, the DNS request is reported to The text is sent to the private network domain analysis module.

Further, in the domain name resolution system in the cloud computing environment of the present invention, the private network domain name resolution module is used to judge whether the received DNS request message belongs to the private network domain, and when the DNS request message belongs to the private network domain, query the private network domain database Whether there is a DNS response message record corresponding to this DNS request message; when the DNS request message does not belong to the private network domain, forward the DNS request message to the public DNS server for analysis through the iterative module.

Further, in the domain name resolution system in the cloud computing environment of the present invention, when the DNS request message belongs to the private network domain, query whether there is a DNS response message record corresponding to the DNS request message in the private network domain database, including: When there is the DNS response message record, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, cache the assembled DNS response message to the cache module of the DNS server in the cloud environment and send it To the client ESC; when there is no record of the DNS response message, the DNS request message is forwarded to the public DNS server through the iterative module for resolution.

Further, in the domain name resolution system in the cloud computing environment of the present invention, the iteration module is used to forward the DNS request message that cannot be resolved by the DNS server in the cloud environment to the public DNS server for resolution.

On the other hand, the present invention provides a domain name resolution method in a cloud computing environment, comprising:

The client ESC sends a DNS request message for domain name resolution to the DNS server in the cloud environment;

The DNS server in the cloud environment parses the DNS request message, and sends the DNS response message to the client ESC after the resolution is successful, and sends the DNS request message to the public DNS server after the resolution fails;

The public DNS server parses the DNS request message, and after the resolution is successful, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends it to the client ESC.

Further, in the domain name resolution method in the cloud computing environment of the present invention, the DNS server in the cloud environment parses the DNS request message, and sends the DNS response message to the client ESC after the resolution is successful, and sends the DNS request message to the client ESC after the resolution fails. Sent to public DNS servers, including:

The DNS server in the cloud environment searches through the caching module whether there is a cached DNS response message record for the request with the same domain name as the DNS request message, and when the cached DNS response message record exists, the cached DNS response message Send to the client ECS; when the cached DNS response record does not exist, send the DNS request message to the private network domain resolution module;

The private network domain name resolution module judges whether the received DNS request message belongs to the private network domain. When the DNS request message belongs to the private network domain, it queries whether there is a DNS response message record corresponding to the DNS request message in the private network domain database. ; When the DNS response message record does not exist, the DNS request message is forwarded to the public DNS server through the iterative module for analysis; when the DNS request message does not belong to the private network domain, the DNS request message is forwarded to the public DNS server through the iterative module Public DNS servers for resolution.

Further, in the domain name resolution method in the cloud computing environment of the present invention, when the DNS request message belongs to the private network domain, query whether there is a DNS response message record corresponding to the DNS request message in the private network domain database, including: When there is the DNS response message record, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, cache the assembled DNS response message to the cache module of the DNS server in the cloud environment and send it to the client ESC.

Further, in the domain name resolution method in the cloud computing environment of the present invention, querying whether there is a DNS response message record corresponding to the DNS request message in the private network domain database includes: querying the domain where the domain name is located, and querying the obtained domain name Query the DNS response message record of the domain name in the domain database.

Further, in the domain name resolution method in the cloud computing environment of the present invention, the public DNS server resolves the DNS request message, and after the resolution is successful, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends it to the client ESC , comprising: querying the public DNS server to obtain a DNS response message record corresponding to the DNS request message, obtaining the corresponding IP address from the DNS response message record, assembling the DNS response message, and caching the DNS response message to the cloud environment cache module of the internal DNS server and send it to the client ESC.

The domain name resolution system and method in the cloud computing environment of the present invention have the following beneficial effects:

1. Even if there is a conflict between the private domain name and the domain to which the public domain name belongs, the private domain name and the public domain name can be resolved at the same time, so that users do not need to re-register the public domain names registered under a large number of conflicting domains that already exist in the cloud The private DNS server provides convenience for users to migrate to the cloud;

2. By caching the public network domain name resolution results, it can reduce the number of requests to the public DNS when the private network DNS server in the cloud resolves the public network domain name, and improve the resolution speed of the public network domain name by the cloud DNS.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is an architecture diagram of a domain name resolution system in a cloud computing environment according to the first exemplary embodiment of the present invention.

Fig. 2 is a flowchart of a domain name resolution method in a cloud computing environment according to the second exemplary embodiment of the present invention.

Fig. 3 is a flowchart of a domain name resolution method in a cloud computing environment according to the third exemplary embodiment of the present invention.

Fig. 4 is a schematic diagram of an application scenario of a domain name resolution method in a cloud computing environment according to the fourth exemplary embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be noted that, in the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other; and, based on the embodiments in the present disclosure, those of ordinary skill in the art obtained without creative work All other embodiments belong to the protection scope of the present disclosure.

It is noted that the following describes various aspects of the embodiments that are within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on the present disclosure one skilled in the art should appreciate that an aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, any number of the aspects set forth herein can be used to implement an apparatus and/or practice a method. In addition, such an apparatus may be implemented and/or such a method practiced using other structure and/or functionality than one or more of the aspects set forth herein.

Fig. 1 is an architecture diagram of a domain name resolution system in a cloud computing environment according to an exemplary first embodiment of the present invention. As shown in Fig. 1, the system of this embodiment includes:

An elastic cloud server, including multiple client ESCs, is used to send DNS request packets and receive DNS response packets;

The DNS server in the cloud environment is composed of a cache module, a private network domain resolution module and an iteration module. It is used to resolve DNS request messages. After the resolution is successful, the DNS response message is sent to the client ESC. After the resolution fails, the DNS request message is sent to sent to a public DNS server;

The public DNS server is used to analyze the DNS request message. After the resolution is successful, the DNS response message is cached to the cache module of the DNS server in the cloud environment and sent to the client ESC.

In the DNS server in the cloud environment of the system of this embodiment, the caching module is used to cache the DNS response message of the DNS request message of the same domain name; it is also used to find out whether there is a cache of the request with the same domain name as the DNS request message DNS response message record, if there is the cached DNS response message record, send the cached DNS response message to the client ECS; if there is no cached DNS response record, send this DNS request message to Private domain analysis module.

In the DNS server in the cloud environment of the system of this embodiment, the private network domain name resolution module is used to judge whether the DNS request message received belongs to the private network domain, and when the DNS request message belongs to the private network domain, query whether there is The DNS response message record corresponding to this DNS request message, when the DNS response message record exists, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, and assemble the DNS response message The response message is cached to the caching module of the DNS server in the cloud environment and sent to the client ESC; when the DNS response message record does not exist, the DNS request message is forwarded to the public DNS server through the iterative module for resolution; when the DNS The request message does not belong to the private network domain, and the DNS request message is forwarded to the public DNS server for analysis through the iterative module.

In the DNS server in the cloud environment of the system in this embodiment, the iteration module is used to forward the DNS request message that cannot be resolved by the DNS server in the cloud environment to the public DNS server for resolution.

In the system of this embodiment, the principle of the private network domain name resolution module for judging whether the received DNS request message belongs to the private network domain is as follows: the distributed database of the DNS is indexed by the domain name, and each domain name is actually a tree structure The path searched from the leaf node to the root node in the reverse tree is called the domain name space, which belongs to the private domain, that is to say, the suffix of the DNS request domain name can be queried in the DNS distributed database of the DNS server in the cloud environment, for example Query the IP corresponding to the www.baidu.com domain name, and baidu.com can be found in the database of the DNS server in the cloud environment. At this time, www.baidu.com is considered to be a private domain.

Fig. 2 is a flowchart of a domain name resolution method in a cloud computing environment according to the second exemplary embodiment of the present invention. As shown in Fig. 2, the method of this embodiment includes:

The client ESC sends a DNS request message for domain name resolution to the DNS server in the cloud environment;

The DNS server in the cloud environment parses the DNS request message, and sends the DNS response message to the client ESC after the resolution is successful, and sends the DNS request message to the public DNS server after the resolution fails;

The public DNS server parses the DNS request message, and after the resolution is successful, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends it to the client ESC.

Fig. 3 is a flow chart of a domain name resolution method in a cloud computing environment according to an exemplary third embodiment of the present invention, this embodiment is a preferred embodiment of the method shown in Fig. 2, as shown in Fig. 3, the method of this embodiment , including:

The client ESC sends a DNS request message for domain name resolution to the DNS server in the cloud environment;

The DNS server in the cloud environment searches through the caching module whether there is a cached DNS response message record for the request with the same domain name as the DNS request message, and when the cached DNS response message record exists, the cached DNS response message Send to the client ECS; when the cached DNS response record does not exist, send the DNS request message to the private network domain resolution module;

The private network domain name resolution module judges whether the received DNS request message belongs to a private network domain. When the DNS request message belongs to a private network domain, it queries whether there is a DNS response message record corresponding to this DNS request message in the private network domain database. , when the DNS response message record exists, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, cache the assembled DNS response message to the caching module of the DNS server in the cloud environment and Send to the client ESC; when the DNS response message record does not exist, the DNS request message is forwarded to the public DNS server through the iteration module for analysis;

When the DNS request message does not belong to the private network domain, the DNS request message is forwarded to the public DNS server for analysis through the iterative module;

The public DNS server parses the DNS request message, and after the resolution is successful, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends it to the client ESC.

In this embodiment, when the DNS request message belongs to the private network domain, whether there is a DNS response message record corresponding to the DNS request message in the private network domain database is inquired in the following manner: query the domain where the domain name is located, and Query the DNS response message record of the domain name in the database of the queried domain. Specifically, the private network domain database finds the corresponding domain according to the longest match of the domain name suffix of the DNS request message (for example, if the www.baidu.com domain name is requested, and there are com domains and baidu.com domains in the private domain database, then the longest match is baidu.com), and then query the DNS record of the domain name in the table of the corresponding domain.

In this embodiment, the public DNS server resolves the DNS request message. After the resolution is successful, the DNS response message is cached to the caching module of the DNS server in the cloud environment and sent to the client ESC, as follows:

The public DNS server queries to obtain the DNS response message record corresponding to the DNS request message, obtains the corresponding IP address from the DNS response message record, assembles the DNS response message, and caches the DNS response message to the DNS server in the cloud environment cache module and sent to the client ESC.

The fourth exemplary embodiment of the present invention provides a domain name resolution method in a cloud computing environment, and this embodiment is a preferred embodiment of the method in the second exemplary embodiment of the present invention.

In an application scenario, the customer registers two domains (zones) as shown in Figure 4 on the DNS server in the cloud environment, zone1 is example.com, zone2 is test.com, and two records are registered under zone1 (record), record1 is 123.example.com, the corresponding IP address is 192.168.0.1; record2 is 456.example.com, the corresponding IP address is 192.168.0.2; register record3 under zone2, record3 is 123.test.com , and the corresponding IP address is 1.1.1.1.

When the client ECS requests to obtain the IP address corresponding to the private network domain name 123.example.com, the domain name resolution process according to the method of the embodiment of the present invention is as follows:

The client ESC sends a DNS request packet resolved by the private network domain name 123.example.com to the DNS server in the cloud environment; the caching module of the DNS server in the cloud environment fails to find the corresponding DNS response packet, and forwards the DNS request packet to Private network domain name resolution module, the private network domain name resolution module queries the domain name of 123.example.com as example.com (zone1), queries the record of 123.example.com in the database of zone1, and obtains the corresponding IP address as 192.168. 0.1, the private network domain name resolution module assembles a DNS response message according to the query result and returns it to the client ECS.

When the client ECS requests to obtain the IP address corresponding to the public network domain name www.example.com, the domain name resolution process according to the method of the embodiment of the present invention is as follows:

The client ECS sends a DNS request message resolved by the public network domain name www.example.com to the DNS server in the cloud environment; the caching module of the DNS server in the cloud environment fails to find the corresponding answer, and forwards the DNS request message to the private network domain name Analysis module, private network domain name analysis module queries www.example.com domain name is located in the domain example.com (zone1), queries www.example.com record in the zone1 database, but the record is not registered in the private network domain zone1 , the private network domain name resolution module forwards the DNS request message to the iterative module, and then the iterative module sends it to the public DNS server. The corresponding IP address is 93.184.216.34 obtained by querying the public DNS server, and assembled into a DNS response message. The response message is cached to the cache module of the DNS server in the cloud environment, and finally returned to the client ECS. When the client ECS requests the IP address corresponding to the same public domain name www.example.com again, the cache module will directly reply the DNS response message to the ECS without accessing the public DNS server again.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A domain name resolution system in a cloud computing environment, characterized in that, the system includes: An elastic cloud server, including multiple client ESCs, is used to send DNS request packets and receive DNS response packets; The DNS server in the cloud environment is composed of a cache module, a private network domain resolution module and an iteration module. It is used to resolve DNS request messages. After the resolution is successful, the DNS response message is sent to the client ESC. After the resolution fails, the DNS request message is sent to sent to a public DNS server; The public DNS server is used to analyze the DNS request message. After the resolution is successful, the DNS response message is cached to the cache module of the DNS server in the cloud environment and sent to the client ESC. 2. the domain name resolution system in the cloud computing environment according to claim 1, is characterized in that, caching module is used for caching the DNS response message of the DNS request message of same domain name; The message has the cached DNS response message record of the request of the same domain name, and when the cached DNS response message record exists, the cached DNS response message is sent to the client ECS; when the cached DNS response record does not exist, Send this DNS request message to the private domain resolution module. 3. The domain name resolution system in the cloud computing environment according to claim 1, wherein the domain name resolution module of the private network is used to judge whether the DNS request message received belongs to the private network domain, when the DNS request message belongs to the private network domain , query whether there is a DNS response message record corresponding to this DNS request message in the private network domain database; when the DNS request message does not belong to the private network domain, forward the DNS request message to the public DNS server for analysis through the iterative module . 4. the domain name resolution system in the cloud computing environment according to claim 3, is characterized in that, when the DNS request message belongs to the private network domain, whether there is a DNS response corresponding to this DNS request message in the query private network domain database A message record, including: when the DNS response message record exists, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, and cache the assembled DNS response message to the DNS in the cloud environment The caching module of the server sends it to the ESC of the client; when the DNS response message record does not exist, the DNS request message is forwarded to the public DNS server through the iterative module for resolution. 5. The domain name resolution system in the cloud computing environment according to claim 1, wherein the iteration module is used to forward the DNS request message that the DNS server in the cloud environment cannot resolve to the public DNS server for resolution. 6. A domain name resolution method in a cloud computing environment, characterized in that, the method includes: The client ESC sends a DNS request message for domain name resolution to the DNS server in the cloud environment; The DNS server in the cloud environment parses the DNS request message, and sends the DNS response message to the client ESC after the resolution is successful, and sends the DNS request message to the public DNS server after the resolution fails; The public DNS server parses the DNS request message, and after the resolution is successful, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends it to the client ESC. 7. the domain name resolution method in the cloud computing environment according to claim 6, it is characterized in that, the DNS server in the cloud environment resolves the DNS request message, and after the resolution is successful, the DNS response message is sent to the client computer ESC, and the resolution fails Then send the DNS request message to the public DNS server, including: The DNS server in the cloud environment searches through the caching module whether there is a cached DNS response message record for the request with the same domain name as the DNS request message, and when the cached DNS response message record exists, the cached DNS response message Send to the client ECS; when the cached DNS response record does not exist, send the DNS request message to the private network domain resolution module; The private network domain name resolution module judges whether the received DNS request message belongs to the private network domain. When the DNS request message belongs to the private network domain, it queries whether there is a DNS response message record corresponding to the DNS request message in the private network domain database. ; When the DNS response message record does not exist, the DNS request message is forwarded to the public DNS server through the iterative module for analysis; when the DNS request message does not belong to the private network domain, the DNS request message is forwarded to the public DNS server through the iterative module Public DNS servers for resolution. 8. the domain name resolution method in the cloud computing environment according to claim 7, is characterized in that, when the DNS request message belongs to the private network domain, whether there is a DNS response corresponding to this DNS request message in the query private network domain database A message record, including: when the DNS response message record exists, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, and cache the assembled DNS response message to the DNS in the cloud environment The cache module of the server and sent to the client ESC. 9. The domain name resolution method in the cloud computing environment according to claim 7, characterized in that, inquiring whether there is a DNS response message record corresponding to this DNS request message in the private network domain database comprises: querying where the domain name is located domain, and query the DNS response message record of the domain name in the database of the queried domain. 10. The domain name resolution method in the cloud computing environment according to claim 6, wherein the public DNS server resolves the DNS request message, and caches the DNS response message to the caching module of the DNS server in the cloud environment after the resolution is successful And sent to the client ESC, including: the public DNS server query to obtain the DNS response message record corresponding to the DNS request message, obtain the corresponding IP address from the DNS response message record, assemble the DNS response message, and DNS response message The message is cached to the cache module of the DNS server in the cloud environment and sent to the client ESC.

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