CN103701957A - Domain name server (DNS) recursive method and system thereof - Google Patents
Domain name server (DNS) recursive method and system thereof Download PDFInfo
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Abstract
The invention provides a domain name server (DNS) recursive method and a system thereof, and belongs to the technical field of domain name resolution of a computer. The method comprises the following steps: receiving a domain name resolution request from a client; inquiring whether a domain name resolution response corresponding to domain name information is cached in a primary cache module or not; if not, transmitting the domain name resolution request to a secondary sharing cache module; inquiring whether the domain name resolution response corresponding to the domain name information is cached in the secondary sharing cache module or not, if no, transmitting the domain name resolution request to a recursive query module; receiving the domain name resolution response which is subjected to a domain name resolution operation aiming at the domain name information from an authority server by the recursive query module; transmitting the domain name resolution response to the secondary sharing cache module; caching and transmitting the domain name resolution response to the primary cache module by the secondary sharing cache module; caching and transmitting the domain name resolution response to the client by the primary cache module.
Description
Technical field
The invention belongs to computer domain name mapping technical field, be specifically related to a kind of DNS recursion method and system thereof.
Background technology
At present the main Shi You of computer domain name system or domain name resolution server (Domain Name System is called for short DNS) operator disposes, and provides free dns resolution service for oneself client.Current internet scale client terminal quantity and domain name be all quantitatively hundred million grades other, in order to tackle such inquiry amount, general deployment way is the dns server that adopts a plurality of units, to take turns the mode turning, realizes load balancing, thereby improves service ability.
Fig. 1 is the dns server query script of a plurality of units of the prior art, as shown in Figure 1, when certain domain name of client-access, to local dns server, send analysis request, local dns server is according to the domain name of client query, first check whether this domain name was queried, and do not have expired, if just exist and directly the result of buffer memory issued to client, if there is no or buffer memory is expired just sends DNS request to authoritative server, by the domain name that finally finds client to need the iterative query of the tree of domain names of authoritative server, the result cache that returns to client and this is searched gets off.
There is following defect in the dns server query script of a plurality of units: because the buffer memory of each dns server is independently, according to the feature of nslookup, the content of every dns server buffer memory is by roughly the same.Separate deployment between this buffer memory, causes data to occur great redundancy on the one hand, waste internal memory; Therefore due to the restriction of unit memory size, cause a lot of domain names cannot be stored in buffer memory on the other hand, need to consume dns server resource and the time is done recursive query, thereby had a strong impact on the performance of dns server.
Summary of the invention
The invention provides a kind of DNS recursion method and system thereof, by adopting the mode of shared drive, improved buffer memory capacity and cache hit rate, further improved the performance of dns server.
For achieving the above object, the invention provides a kind of DNS recursion method, this DNS recursion method comprises:
Reception is from the domain name mapping request of client;
Whether inquiry has the buffer memory domain name mapping corresponding with domain-name information response in level cache module, if do not have, utilizes consistency Hash mapping algorithm that domain name analysis request is sent in secondary shared buffer memory module and the corresponding dns server of this domain name;
In inquiry secondary shared buffer memory module, corresponding dns server has not corresponding with domain name information domain name mapping response, if do not have, domain name analysis request is sent to recursive query module;
Recursive query module receives the domain name mapping request that described secondary shared buffer memory module sends, and carries out iterative query and obtains domain name mapping response, and the corresponding domain name mapping response inquiring is sent to described secondary shared buffer memory module to authoritative server;
L2 cache sharing module buffer memory also sends this domain name mapping and responds to level cache module, and level cache module buffer memory also sends this domain name mapping response to described client.
Further; described secondary shared buffer memory module comprises a plurality of dns servers; the domain name mapping response that described a plurality of dns server distributed caching is corresponding with domain-name information: adopt consistency hash algorithm; domain name and described a plurality of dns server are mapped on Hash ring; and the cryptographic Hash along clockwise direction from domain name; until meet the cryptographic Hash of a server; the domain name mapping response that this domain name is corresponding is stored on this server, completes the mapping that all domain name mappings respond server.
Further, level cache module and secondary shared buffer memory module be data cached for this module of looking ahead also, flush buffers data in a period of time before buffer memory is expired.
Further, this DNS recursion method also comprises:
When level cache module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to described client.
Further, this DNS recursion method also comprises:
When secondary shared buffer memory module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to level cache module, and this domain name mapping response of level cache module buffer memory also sends to described client by domain name resolution response.
For achieving the above object, the invention provides a kind of DNS recursive system, comprising:
Query processing module, receives the domain name mapping request from client;
Level cache module, when not having the buffer memory domain name mapping corresponding with domain-name information to respond in level cache module, utilize consistency Hash mapping algorithm that domain name analysis request is sent in secondary shared buffer memory module and the corresponding dns server of this domain name;
Secondary shared buffer memory module, for when corresponding with the domain name information domain name mapping of the corresponding dns server of secondary shared buffer memory module responds, domain name analysis request is sent to recursive query module, and when in secondary shared buffer memory module, corresponding dns server is cached with the domain name mapping response corresponding with domain name information, send this domain name mapping and respond to level cache module, level cache module buffer memory also sends this domain name mapping response to described client;
Recursive query module, the domain name mapping request sending for receiving described secondary shared buffer memory module, carries out iterative query to authoritative server and obtains domain name mapping response, and the corresponding domain name mapping response inquiring is sent to described secondary shared buffer memory module.
Further, described query processing module also when being cached with corresponding domain name mapping response in level cache module, is sent to client by domain name resolution response.
Further.Described secondary shared buffer memory module comprises a plurality of dns servers, a plurality of domain name mapping responses that described a plurality of dns server distributed cachings are corresponding with domain-name information.
Further, also comprise: control module, for notifying described query processing module by the corresponding relation of domain name and secondary shared buffer memory module in real time.
Further, also comprise: communication module, for setting up the communication between query processing module, cache module, recursive query module and control module.
Further, described level cache module and secondary shared buffer memory module are divided into buffer memory and the negative buffer memory of DNS data pack buffer and DNS resource record, the buffer memory of the buffer memory shared resource record of packet.
DNS recursion method provided by the invention and system thereof, by secondary shared buffer memory module is set, adopting distributed caching data to realize internal memory shares, the data cached of every dns server shared mutually, reduce data cached redundancy, save internal memory, improved data cached capacity and cache hit rate, this has improved search efficiency, and the online that has promoted user is experienced.
Accompanying drawing explanation
Fig. 1 is the dns server query script schematic diagram of a plurality of units in prior art;
The schematic flow sheet of the DNS recursion method that Fig. 2 provides for the embodiment of the present invention one;
The structural representation of the DNS recursive system that Fig. 3 provides for the embodiment of the present invention two;
Fig. 4 is the schematic diagram that the domain name in embodiment bis-is mapped to dns server;
Fig. 5 is the schematic flow sheet that in Fig. 4, domain name is mapped to dns server;
Fig. 6 is the application schematic diagram of DNS recursive system.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The schematic flow sheet of the DNS recursion method that Fig. 2 provides for the embodiment of the present invention one, as shown in Figure 2, this DNS recursion method comprises:
Step S201, receive the domain name mapping request from client, in domain name analysis request, carry domain-name information.
Particularly, when client need to be accessed a certain website, will send domain name mapping request to dns server, in this domain name mapping request, carry the domain-name information of this website.
Whether step S202, inquiry have in level cache module the domain name mapping response that buffer memory is corresponding with domain-name information, if no, utilize consistency Hash mapping algorithm that domain name analysis request is sent in secondary shared buffer memory module and the corresponding dns server of this domain name.
Particularly, when client sends domain name mapping request to dns server, in this domain name mapping request, carried the domain-name information of this website, first inquire about level cache module, also be local cache, at domain-name information, when level cache module is cached with the domain name mapping response corresponding with domain name information, domain name mapping request response is sent to client; When local cache does not have the buffer memory domain name mapping corresponding with domain-name information response, the secondary shared buffer memory module corresponding to domain name sends inquiry request.Wherein, level cache module and enquiry module are arranged in dns server, and keep and record the focus domain name of topn, and level cache module is shared drive not.
In step S203, inquiry secondary shared buffer memory module, corresponding dns server has not corresponding with domain name information domain name mapping response, if do not have, domain name analysis request is sent to recursive query module.
Particularly, when secondary shared buffer memory module is cached with the domain name mapping response corresponding with domain-name information, domain name mapping response is sent to level cache module, this domain name mapping response of level cache module buffer memory also sends to client by domain name mapping response; When secondary shared buffer memory module does not have the buffer memory domain name mapping corresponding with domain-name information response, domain name mapping request is sent to recursive query module.
Step S204, recursive query module receive the domain name mapping request that described secondary shared buffer memory module sends, to authoritative server, carry out iterative query and obtain domain name mapping response, and the corresponding domain name mapping response inquiring is sent to described secondary shared buffer memory module.
Particularly, recursive query module is sent to authoritative server by domain name mapping request, and authoritative server carries out the domain name mapping response obtaining after domain name mapping operation for domain-name information, and domain name mapping response is sent to secondary shared buffer memory module.
Step S205, L2 cache sharing module send this domain name mapping and respond to level cache module, and this domain name mapping response of level cache module also sends to described client by domain name resolution response.
Particularly, secondary shared buffer memory module buffer memory also sends this domain name mapping and responds to level cache module, and level cache module buffer memory also sends this domain name mapping response to described client.
Preferably, secondary shared buffer memory module comprises a plurality of dns servers, is cached with a plurality of domain name mapping responses corresponding with domain-name information in described a plurality of dns servers.Secondary shared buffer memory module comprises a plurality of dns servers; the domain name mapping response that described a plurality of dns server distributed caching is corresponding with domain-name information: adopt consistency hash algorithm; domain name and described a plurality of dns server are mapped on Hash ring; and the cryptographic Hash along clockwise direction from domain name; until meet the cryptographic Hash of a server; the domain name mapping response that this domain name is corresponding is stored on this server, completes the mapping that all domain name mappings respond server.
In the present embodiment, adopt consistency hash algorithm, described a plurality of dns servers and described a plurality of domain name mapping response are mapped on Hash ring, and described a plurality of domain name mappings are responded in described a plurality of dns servers.
Preferably, level cache module and secondary shared buffer memory module be data cached for this module of looking ahead also, and flush buffers data in a period of time before buffer memory is expired, to improve cache hit rate.
Preferably, when level cache module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to described client.When secondary shared buffer memory module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to level cache module, and this domain name mapping response of level cache module buffer memory also sends to described client by domain name resolution response.
Further, level cache module comprises data pack buffer, resource record buffer memory and negative buffer memory, and secondary shared buffer memory module comprises data pack buffer, resource record buffer memory and negative buffer memory.Negative buffer memory makes dns server needn't frequently inquire about non-existent domain name, reduces the response time of dns server.Preferably, data pack buffer shared resource record buffer memory.Thereby utilized to greatest extent internal memory, reached high level cache utilance, improved the search efficiency of domain name mapping, further improved the performance of dns server.
The DNS recursion method that the present embodiment provides, by secondary shared buffer memory module is set, adopting distributed caching data to realize internal memory shares, the data cached of every dns server shared mutually, reduce data cached redundancy, save internal memory, improved data cached capacity and cache hit rate, this has improved search efficiency, and the online that has promoted user is experienced.
The structural representation of the DNS recursive system that Fig. 3 provides for the embodiment of the present invention two, as shown in Figure 3, this DNS recursive system comprises: query processing module 301, level cache module 3021, secondary shared buffer memory module 3022, recursive query module 303, control module 304 and communication module 305.
Wherein, query processing module 301, for receiving the domain name mapping request of client, and is sent to client by the corresponding domain name mapping response inquiring.Preferably, query processing module 301 also when being cached with corresponding domain name mapping response in level cache module 3021, is sent to client by domain name resolution response.
Secondary shared buffer memory module 3022, for when corresponding with the domain name information domain name mapping of the corresponding dns server of secondary shared buffer memory module 3022 responds, domain name analysis request is sent to recursive query module 303, and when in secondary shared buffer memory module 3022, corresponding dns server has the domain name mapping response corresponding with domain name information, send this domain name mapping and respond to level cache module 3021,3021 these domain name mapping responses of level cache module also send to described client by domain name resolution response.Secondary shared buffer memory module comprises a plurality of dns servers, a plurality of domain name mapping responses that described a plurality of dns server distributed cachings are corresponding with domain-name information.
Further, level cache module 3021 and secondary shared buffer memory module 3022 comprise data pack buffer, resource record buffer memory and negative buffer memory, data pack buffer shared resource record buffer memory.
In the present embodiment, client is sent domain name mapping request to query processing module 301, query processing module 301 receives the domain name mapping request of client, whether inquiry judging level cache module 3021 has corresponding domain name mapping response, if, acknowledged client end, if not, to secondary shared buffer memory module 3022 corresponding to domain name, send domain name mapping request, whether secondary shared buffer memory module 3022 inquiry judging buffer memory shared resources have corresponding domain name mapping response record, if, corresponding domain name mapping response record is returned to level cache module 3021, this corresponding domain name mapping response record of level cache module 3021 buffer memorys also sends to client, if not, to recursive query module 303, send inquiry request, recursive query module 303 is carried out iterative query to authoritative server, and domain name mapping response results corresponding to inquiry returned to secondary shared buffer memory module 3022, this corresponding domain name mapping response record of secondary shared buffer memory module 3022 buffer memorys, and returned to level cache module 3021, this corresponding domain name mapping response record of level cache module 3021 buffer memorys also sends to client, since then, complete the response of the domain name mapping request that client is sent.
Further, control module 304 adopts consistency hash algorithm.User interface as whole system, be deployed on Centroid, be responsible for configuration and the control of all modules, XM management and supervision, comprise and increase node and deletion of node, control data cached being assigned in each cache module, in real time by the corresponding relation notice enquiry module of domain name and cache module.
Fig. 4 is the schematic diagram that the domain name in embodiment bis-is mapped to dns server, and Fig. 5 is the schematic flow sheet that in Fig. 4, domain name is mapped to dns server, and as shown in Figure 4 with shown in Fig. 5, the step that consistency hash algorithm is realized data distributed caching technology comprises:
Step 501, the value space of hash function is set.
Particularly, the value space of establishing hash function H is that 0-2^n-1(is that cryptographic Hash is that a n position is without symbol shaping), whole cryptographic Hash space imagination is become to an end to end annulus.
Step 502, dns server should be mapped on Hash ring.
Particularly, use hash function to calculate a cryptographic Hash each server, can select the IP of dns server or host name to carry out Hash as keyword, every dns server just can be determined its position on Hash ring like this.
Step 503, domain name mapping response is mapped on Hash ring.
Particularly, domain name mapping response is carried out to cryptographic Hash calculating, domain name mapping response is mapped on Hash ring.
Step 504, by domain name mapping response buffer to dns server.
Particularly, at server and domain name, all by same hash function, be mapped to behind cryptographic Hash space, if follow the cryptographic Hash along clockwise direction from domain name, until meet the cryptographic Hash of a server, the record of this domain name is stored on this server, so completes the mapping that all domain names are recorded to server.
Further, control module can be carried out node administration, and node administration comprises increases node or deletion of node.Particularly; increasing node comprises: if add a new server; control module will be calculated a cryptographic Hash to this server and be mapped on Hash ring; suppose to be mapped to the A position between server2 and server3 in Fig. 5; at this moment being mapped to domain name between server2 and A will change and store on newly-increased server from storing before server3 into; and A still stores on server3 to the domain name between server3; the domain name record of other original server stores is all constant, and affected is only the next server of newly-increased server.Now, control module can be moved the server2 and the record of the domain name between A that are stored on server3 on newly-increased server.Accordingly, deletion of node comprises: suppose that the server3 in Fig. 5 has delayed machine, the domain name record being now stored on server3 will store server3 into above, and other servers are constant.
The DNS recursive system that the present embodiment provides, by secondary shared buffer memory module is set, adopting distributed caching data to realize internal memory shares, the data cached of every dns server shared mutually, reduce data cached redundancy, save internal memory, improved data cached capacity and cache hit rate, this has improved search efficiency, and the online that has promoted user is experienced.
Fig. 6 is the application schematic diagram of DNS recursive system, as shown in Figure 6, this DNS recursive system comprises: dns server and authoritative server, dns server comprises level cache module, secondary shared buffer memory module and recursive query module, dns server receives the domain name mapping request from client, in domain name mapping request, carry domain-name information, whether inquiry has in level cache module the domain name mapping response that buffer memory is corresponding with domain-name information, if no, domain name mapping request is sent to secondary shared buffer memory module, whether inquiry secondary shared buffer memory module has the domain name mapping response that buffer memory is corresponding with domain-name information, if do not have, domain name mapping request is sent to recursive query module, recursive query module is sent to authoritative server by domain name mapping request, authoritative server carries out sending to secondary shared buffer memory module after parse operation for domain-name information, secondary shared buffer memory module is preserved and is sent domain name mapping and responds to level cache module, level cache module is preserved and is sent this domain name mapping and responds to client, since then, complete the response of the domain name mapping request that client is sent.
DNS recursive system provided by the invention, by arranging secondary shared buffer memory module.Adopt the shared mode of internal memory, the data cached of every dns server shared mutually, reduce data cached redundancy, save internal memory, improved buffer memory capacity and cache hit rate, thereby improved the performance of dns server.
Be understandable that, above execution mode is only used to principle of the present invention is described and the illustrative embodiments that adopts, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (11)
1. a DNS recursion method, is characterized in that, comprising:
Reception is from the domain name mapping request of client;
Whether inquiry has the buffer memory domain name mapping corresponding with domain-name information response in level cache module, if do not have, utilizes consistency Hash mapping algorithm that domain name analysis request is sent in secondary shared buffer memory module and the corresponding dns server of this domain name;
In inquiry secondary shared buffer memory module, corresponding dns server has not corresponding with domain name information domain name mapping response, if do not have, domain name analysis request is sent to recursive query module;
Recursive query module receives the domain name mapping request that described secondary shared buffer memory module sends, and carries out iterative query and obtains domain name mapping response, and the corresponding domain name mapping response inquiring is sent to described secondary shared buffer memory module to authoritative server;
L2 cache sharing module buffer memory also sends this domain name mapping and responds to level cache module, and level cache module buffer memory also sends this domain name mapping response to described client.
2. DNS recursion method according to claim 1; it is characterized in that; described secondary shared buffer memory module comprises a plurality of dns servers; the domain name mapping response that described a plurality of dns server distributed caching is corresponding with domain-name information: adopt consistency hash algorithm; domain name and described a plurality of dns server are mapped on Hash ring; and the cryptographic Hash along clockwise direction from domain name; until meet the cryptographic Hash of a server; the domain name mapping response that this domain name is corresponding is stored on this server, completes the mapping that all domain name mappings respond server.
3. DNS recursion method according to claim 2, is characterized in that, level cache module and secondary shared buffer memory module be data cached for this module of looking ahead also, flush buffers data in a period of time before buffer memory is expired.
4. DNS recursion method according to claim 1, is characterized in that, the method also comprises:
When level cache module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to described client.
5. DNS recursion method according to claim 1, is characterized in that, the method also comprises:
When secondary shared buffer memory module is cached with the domain name mapping response corresponding with domain name information, domain name resolution response is sent to level cache module, and this domain name mapping response of level cache module buffer memory also sends to described client by domain name resolution response.
6. a DNS recursive system, is characterized in that, comprising:
Query processing module, receives the domain name mapping request from client;
Level cache module, when not having the buffer memory domain name mapping corresponding with domain-name information to respond in level cache module, utilize consistency Hash mapping algorithm that domain name analysis request is sent in secondary shared buffer memory module and the corresponding dns server of this domain name;
Secondary shared buffer memory module, for when corresponding with the domain name information domain name mapping of the corresponding dns server of secondary shared buffer memory module responds, domain name analysis request is sent to recursive query module, and when in secondary shared buffer memory module, corresponding dns server is cached with the domain name mapping response corresponding with domain name information, send this domain name mapping and respond to level cache module, level cache module buffer memory also sends this domain name mapping response to described client;
Recursive query module, the domain name mapping request sending for receiving described secondary shared buffer memory module, carries out iterative query to authoritative server and obtains domain name mapping response, and the corresponding domain name mapping response inquiring is sent to described secondary shared buffer memory module.
7. DNS recursive system according to claim 6, is characterized in that, described query processing module also when being cached with corresponding domain name mapping response in level cache module, is sent to client by domain name resolution response.
8. DNS recursive system according to claim 7, is characterized in that, described secondary shared buffer memory module comprises a plurality of dns servers, a plurality of domain name mapping responses that described a plurality of dns server distributed cachings are corresponding with domain-name information.
9. DNS recursive system according to claim 8, is characterized in that, also comprises: control module, and for notifying described query processing module by the corresponding relation of domain name and secondary shared buffer memory module in real time.
10. DNS recursive system according to claim 9, is characterized in that, also comprises: communication module, and for setting up the communication between query processing module, cache module, recursive query module and control module.
11. DNS recursive systems according to claim 6, it is characterized in that, described level cache module and described secondary shared buffer memory module are divided into buffer memory and the negative buffer memory of DNS data pack buffer and DNS resource record, the buffer memory of the buffer memory shared resource record of packet.
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