CN115297088A - Domain name resolution system and method in cloud computing environment - Google Patents
Domain name resolution system and method in cloud computing environment Download PDFInfo
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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
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
A Virtual Private Cloud (VPC) is a private network customized by a user in a cloud environment, an Elastic Cloud Server (ECS) is a virtual server created by the user in the VPC, and the ECS will access both a public network and a private network. The first step in accessing both public and private networks is to send a request to a Domain Name System (DNS), which is a system on the internet that maps domain names and IP addresses to each other, and then notify the ECS of the IP address corresponding to the domain name to initiate a continuous IP address access.
At present, a DNS request initiated by an ECS in a cloud computing environment first reaches a DNS service in a cloud environment, and the DNS service in the cloud environment judges whether or not it is an authoritative DNS server of a domain (zone) in which a domain name (record) is located, if so, a corresponding record is searched for in a database of the zone, if so, a corresponding IP address is returned, and if not, an error is returned; if not, the DNS request is sent iteratively to the public DNS server to continue resolution. The prior art has the following defects that when the DNS in the cloud environment considers that the DNS is the authoritative DNS server of the zone, the record is not in the database of the DNS server in the cloud environment, and when the record is in the database of the public DNS server, the DNS request cannot be normally resolved.
The reason for this deficiency is that in the current DNS system for cloud computing, if a domain belongs to a DNS within the cloud environment (i.e., a domain can be queried in a database of a DNS server within the cloud environment), the domain can only be resolved by the DNS within the cloud environment and cannot be resolved by the public DNS, and at this time, if a client has registered a large number of records of the same domain in the public DNS server, the resolution of the records needs to be re-registered in the DNS within the cloud environment again, which causes great inconvenience.
Therefore, how to solve the problem in the cloud computing DNS field by a method that not only can have DNS resolution in a cloud environment but also can have DNS resolution by a public DNS for the same domain becomes an urgent problem.
Disclosure of Invention
In view of the above, the present invention provides a domain name resolution system and method in a cloud computing environment.
In one aspect, the present invention provides a domain name resolution system in a cloud computing environment, including:
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.
Further, in the domain name resolution system in the cloud computing environment, the cache module is used for caching the DNS response messages of the DNS request messages with the same domain name; the server is also used for searching whether a cache DNS response message record of a request with the same domain name as the DNS request message exists or not, and when the cache DNS response message record exists, sending the cache DNS response message to the client ECS; and when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module.
Further, in the domain name resolution system in the cloud computing environment, the private network domain name resolution module is used for judging whether the received DNS request message belongs to a private network domain, and when the DNS request message belongs to the private network domain, inquiring whether a DNS response message record corresponding to the DNS request message exists in a private network domain database; and when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
Further, in the domain name resolution system in the cloud computing environment of the present invention, when the DNS request packet belongs to a private network domain, querying whether a DNS response packet record corresponding to the DNS request packet exists in a private network domain database includes: when the DNS response message record exists, acquiring a corresponding IP address from the DNS response message record, assembling the DNS response message, caching the assembled DNS response message to a cache module of a DNS server in a cloud environment, and sending the assembled DNS response message to a client ESC; and when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
Further, in the domain name resolution system in the cloud computing environment, the iteration module is used for forwarding the DNS request message which cannot be resolved by the DNS server in the cloud environment to the public DNS server for resolution.
In another aspect, the present invention provides a domain name resolution method in a cloud computing environment, including:
a client ESC sends a DNS request message for domain name resolution to a DNS server in a cloud environment;
the DNS server in the cloud environment analyzes the DNS request message, sends a DNS response message to a client ESC after the analysis is successful, and sends the DNS request message to a public DNS server after the analysis is failed;
and the public DNS server analyzes the DNS request message, caches 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 sends the DNS response message to the client ESC.
Further, in the method for analyzing a domain name in a cloud computing environment of the present invention, the DNS server in the cloud environment analyzes the DNS request packet, sends the DNS response packet to the client ESC after the successful analysis, and sends the DNS request packet to the public DNS server after the failed analysis, including:
in a cloud environment, a DNS server searches whether a cached DNS response message record of a request with the same domain name as a current DNS request message exists or not through a caching module, and when the cached DNS response message record exists, the cached DNS response message is sent to an ECS (electronic communications server); when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module;
the private network domain name resolution module judges whether the received DNS request message belongs to a private network domain, and when the DNS request message belongs to the private network domain, whether a DNS response message record corresponding to the DNS request message exists in a private network domain database is inquired; when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis; and when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
Further, in the method for analyzing a domain name in a cloud computing environment of the present invention, when the DNS request packet belongs to a private network domain, querying whether a DNS response packet record corresponding to the DNS request packet exists in a private network domain database includes: and when the DNS response message record exists, acquiring a corresponding IP address from the DNS response message record, assembling the DNS response message, caching the assembled DNS response message to a cache module of a DNS server in a cloud environment, and sending the assembled DNS response message to a client ESC.
Further, in the method for analyzing a domain name in a cloud computing environment of the present invention, querying whether a DNS response packet record corresponding to the DNS request packet exists in a private domain database includes: and inquiring the domain where the domain name is located, and inquiring DNS response message records of the domain name in a database of the inquired domain.
Further, in the method for analyzing a domain name in a cloud computing environment of the present invention, a public DNS server analyzes a DNS request packet, and after the DNS request packet is successfully analyzed, the DNS response packet is cached in a cache module of a DNS server in the cloud environment and sent to a client ESC, including: the public DNS server queries to obtain a DNS response message record corresponding to the DNS request message, obtains a corresponding IP address from the DNS response message record, assembles the DNS response message, caches the DNS response message to a cache module of the DNS server in the cloud environment and sends the DNS response message to the client ESC.
The system and the method for domain name resolution in the cloud computing environment have the following beneficial effects:
1. even if the private network domain name conflicts with the domain to which the public network domain name belongs, the private network domain name and the public network domain name can be simultaneously analyzed, so that a user does not need to re-register the public network domain name registered under a large number of existing conflict domains to a private network DNS server in the cloud, and convenience is brought to the user to move to the cloud;
2. by caching the public network domain name resolution result, 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 can be reduced, and the resolution speed of the DNS in the cloud to the public network domain name is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
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.
Fig. 2 is a flowchart illustrating a domain name resolution method in a cloud computing environment according to an exemplary second embodiment of the present invention.
Fig. 3 is a flowchart illustrating a domain name resolution method in a cloud computing environment according to an exemplary third embodiment of the present invention.
Fig. 4 is a schematic view of an application scenario of a domain name resolution method in a cloud computing environment according to an exemplary fourth embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the features in the following embodiments and examples may be combined with each other; moreover, all other embodiments that can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort fall within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below 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 merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one 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, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to 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:
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 a DNS request message, sending a DNS response message to a client ESC after the DNS response message is successfully analyzed, and sending the DNS request message to a 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.
In a DNS server in a cloud environment of the system of this embodiment, a cache module is used to cache DNS response messages of DNS request messages with the same domain name; the server is also used for searching whether a cache DNS response message record of a request with the same domain name as the DNS request message exists or not, and when the cache DNS response message record exists, sending the cache DNS response message to the client ECS; and when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module.
In a DNS server in a cloud environment of the system of this embodiment, a private domain name resolution module is configured to determine whether a received DNS request packet belongs to a private domain, query whether a DNS response packet record corresponding to the DNS request packet exists in a private domain database when the DNS request packet belongs to the private domain, obtain a corresponding IP address from the DNS response packet record when the DNS response packet record exists, assemble a DNS response packet, cache the assembled DNS response packet to a cache module of the DNS server in the cloud environment, and send the assembled DNS response packet to a client ESC; when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis; and when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
In the DNS server in the cloud environment of the system according to this embodiment, the iteration module is configured to forward a DNS request packet that cannot be analyzed by the DNS server in the cloud environment to the public DNS server for analysis.
In the system of this embodiment, the principle that the private domain name resolution module is used to determine whether the received DNS request packet belongs to the private domain is as follows: the distributed database of the DNS is indexed by domain names, each domain name is actually a path searched from a leaf node to a root node in a tree structure, this reverse tree is called a domain name space, and a suffix of a domain name requested by the DNS can be queried in the DNS distributed database in the DNS server in the cloud environment, that is, an IP corresponding to a www.baidu.com domain name can be queried, and a baidu.com can be queried in the database of the DNS server in the cloud environment, and at this time, the www.baidu.com is considered to belong to the private domain.
Fig. 2 is a flowchart of a domain name resolution method in a cloud computing environment according to an exemplary second embodiment of the present invention, and as shown in fig. 2, the method of the embodiment includes:
a client ESC sends a DNS request message for domain name resolution to a DNS server in a cloud environment;
the DNS server analyzes the DNS request message in the cloud environment, the DNS response message is sent to the client ESC after the DNS request message is successfully analyzed, and the DNS request message is sent to the public DNS server after the DNS request message is failed to be analyzed;
and the public DNS server analyzes the DNS request message, caches 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 sends the DNS response message to the client ESC.
Fig. 3 is a flowchart of a domain name resolution method in a cloud computing environment according to an exemplary third embodiment of the present invention, where this embodiment is a preferred embodiment of the method shown in fig. 2, and as shown in fig. 3, the method in this embodiment includes:
a client ESC sends a DNS request message for domain name resolution to a DNS server in a cloud environment;
in the cloud environment, a DNS server searches whether a cached DNS response message record of a request with the same domain name as a DNS request message exists through a caching module, and when the cached DNS response message record exists, the cached DNS response message is sent to a client ECS; when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module;
the private network domain name analyzing module judges whether the received DNS request message belongs to a private network domain, when the DNS request message belongs to the private network domain, whether DNS response message records corresponding to the DNS request message exist in a private network domain database or not is inquired, when the DNS response message records exist, corresponding IP addresses are obtained from the DNS response message records, the DNS response message is assembled, and the assembled DNS response message is cached to a cache module of a DNS server in a cloud environment and is sent to a client ESC; when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis;
when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis;
and the public DNS server analyzes the DNS request message, caches 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 sends the DNS response message to the client ESC.
In this embodiment, when the DNS request message belongs to a private network domain, whether a DNS response message record corresponding to the DNS request message exists in a private network domain database is queried, which is performed in the following manner: and inquiring the domain where the domain name is located, and inquiring DNS response message records of the domain name in a database of the inquired domain. Specifically, the private domain database finds a corresponding domain according to the longest match of the domain suffix of the DNS request message (for example, when a www.baidu.com domain is requested, the longest match is baidu.com domain if there is com domain and baidu.com domain in the private domain database), and then queries the DNS record of the domain name in the table of the corresponding domain.
In this embodiment, the public DNS server parses the DNS request message, and after the DNS request message is successfully parsed, caches the DNS response message to the cache module of the DNS server in the cloud environment and sends the DNS response message to the client ESC in the following manner:
the public DNS server queries to obtain a DNS response message record corresponding to the DNS request message, obtains a corresponding IP address from the DNS response message record, assembles the DNS response message, caches the DNS response message to a cache module of the DNS server in the cloud environment and sends the DNS response message to the client ESC.
An exemplary fourth 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 according to the exemplary second embodiment of the present invention.
In one application scenario, a client registers two domains (zones) as shown in fig. 4 on a DNS server in a cloud environment, zone1 is example.com, zone2 is test.com, and registers two records (records) under zone1, record1 is 123.example.com, and a corresponding IP address is 192.168.0.1; record2 is 456.Example. Com, and the corresponding IP address is 192.168.0.2; record3 is registered under zone2, record3 is 123.test.com, and the corresponding IP address is 1.1.1.1.
When the client ECS requests to acquire an 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:
a client ESC sends a DNS request message analyzed by a private network domain name 123.example.com to a DNS server in a cloud environment; and a cache module of the DNS server in the cloud environment does not find a corresponding DNS response message, forwards the DNS request message to a private network domain name analysis module, the private network domain name analysis module queries that a domain where the 123.example.com domain name is located is example.com (zone 1), queries 123.example.com records in a zone1 database to obtain a corresponding IP address of 192.168.0.1, and the private network domain name analysis module assembles the DNS response message according to the query result and returns the DNS response message to the client ECS.
When the client ECS requests to acquire an IP address corresponding to the public network domain name www.
The client ECS sends a DNS request message analyzed by a public network domain name www.example.com to a DNS server in a cloud environment; the method comprises the steps that a cache module of a DNS server in the cloud environment does not find a corresponding response, a DNS request message is forwarded to a private network domain name analysis module, the private network domain name analysis module inquires that a domain where a www.example.com domain name is located is example.com (zone 1), a www.example.com record is inquired in a zone1 database, but the record is not registered in the private network domain zone1, the private network domain name analysis module forwards the DNS request message to an iteration module, the iteration module sends the DNS request message to a public DNS server, the public DNS server inquires to obtain a corresponding IP address of 93.184.216.34, the IP address is 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 the DNS request message returns to a client ECS. When the client ECS requests the IP address corresponding to the same public network domain name www.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A domain name resolution system in a cloud computing environment, the system comprising:
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.
2. The domain name resolution system in the cloud computing environment according to claim 1, wherein the cache module is configured to cache DNS reply messages of DNS request messages of the same domain name; the server is also used for searching whether a cache DNS response message record of a request with the same domain name as the DNS request message exists or not, and when the cache DNS response message record exists, sending the cache DNS response message to the client ECS; and when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module.
3. The domain name resolution system in the cloud computing environment according to claim 1, wherein the private domain name resolution module is configured to determine whether the received DNS request packet belongs to a private domain, and when the DNS request packet belongs to the private domain, query whether a DNS response packet record corresponding to the DNS request packet exists in a private domain database; and when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
4. The domain name resolution system in the cloud computing environment according to claim 3, wherein when the DNS request packet belongs to a private network domain, querying whether a DNS response packet record corresponding to the DNS request packet exists in a private network domain database includes: when the DNS response message record exists, acquiring a corresponding IP address from the DNS response message record, assembling a DNS response message, caching the assembled DNS response message to a cache module of a DNS server in a cloud environment, and sending the DNS response message to a client ESC; and when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
5. The domain name resolution system in the cloud computing environment of claim 1, wherein the iteration module is configured to forward a DNS request packet that cannot be resolved by a DNS server in the cloud environment to a public DNS server for resolution.
6. A domain name resolution method in a cloud computing environment, the method comprising:
a client ESC sends a DNS request message for domain name resolution to a DNS server in a cloud environment;
the DNS server in the cloud environment analyzes the DNS request message, sends a DNS response message to a client ESC after the analysis is successful, and sends the DNS request message to a public DNS server after the analysis is failed;
and the public DNS server analyzes the DNS request message, caches 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 sends the DNS response message to the client ESC.
7. The method for resolving a domain name in a cloud computing environment according to claim 6, wherein a DNS server in the cloud environment resolves the DNS request packet, sends the DNS response packet to the client ESC after the resolution is successful, and sends the DNS request packet to the public DNS server after the resolution is failed, the method comprising:
in a cloud environment, a DNS server searches whether a cached DNS response message record of a request with the same domain name as a current DNS request message exists or not through a caching module, and when the cached DNS response message record exists, the cached DNS response message is sent to an ECS (electronic communications server); when the cached DNS response record does not exist, sending the DNS request message to a private network domain analysis module;
the private network domain name resolution module judges whether the received DNS request message belongs to a private network domain, and when the DNS request message belongs to the private network domain, whether a DNS response message record corresponding to the DNS request message exists in a private network domain database is inquired; when the DNS response message record does not exist, forwarding the DNS request message to a public DNS server through an iteration module for analysis; and when the DNS request message does not belong to the private network domain, forwarding the DNS request message to a public DNS server through an iteration module for analysis.
8. The domain name resolution method in the cloud computing environment according to claim 7, wherein, when the DNS request packet belongs to a private network domain, querying whether a DNS response packet record corresponding to the DNS request packet exists in a database of the private network domain includes: and when the DNS response message record exists, acquiring a corresponding IP address from the DNS response message record, assembling the DNS response message, caching the assembled DNS response message to a cache module of a DNS server in a cloud environment, and sending the assembled DNS response message to a client ESC.
9. The domain name resolution method in the cloud computing environment according to claim 7, wherein querying whether a DNS response packet record corresponding to the DNS request packet exists in a private domain database includes: and inquiring the domain where the domain name is located, and inquiring DNS response message records of the domain name in a database of the inquired domain.
10. The method for domain name resolution in a cloud computing environment according to claim 6, wherein the public DNS server resolves the DNS request message, and after the resolution is successful, the DNS response message is cached to a cache module of the DNS server in the cloud environment and sent to the client ESC, and the method comprises the following steps: the public DNS server queries to obtain a DNS response message record corresponding to the DNS request message, obtains a corresponding IP address from the DNS response message record, assembles the DNS response message, caches the DNS response message to a cache module of the DNS server in the cloud environment and sends the DNS response message to the client ESC.
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