CN105516391A - CNAME-based DNS (domain name system) domain name resolution method - Google Patents
CNAME-based DNS (domain name system) domain name resolution method Download PDFInfo
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- CN105516391A CN105516391A CN201510993981.9A CN201510993981A CN105516391A CN 105516391 A CN105516391 A CN 105516391A CN 201510993981 A CN201510993981 A CN 201510993981A CN 105516391 A CN105516391 A CN 105516391A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
Abstract
The invention belongs to the computer technical field and discloses a CNAME-based DNS (domain name system) domain name resolution method. The method comprises the following steps that: a plurality of CNAMEs are set, and priorities are set for the CNAMEs; detection nodes are set in CDNs (content delivery network) in different areas; a CDN with optimal service performance is determined through strategies such as polling, weight setting and a prioritizing algorithm; and switching is carried out, so that the CDN with optimal service performance responds to domain name query. With the method of the invention adopted, the performance of domain name services and user experience can be improved, and the security, maintainability and reliability of a domain name server can be improved.
Description
Technical field
The present invention relates to field of computer technology, particularly a kind of DNS name resolution method based on CNAME.
Background technology
In DNS (DomainNameSystem, domain name system), each authoritative name server there is a area file, comprising the various domain name data stored with resource record form.Wherein, CNAME refers to canonical name, and also referred to as specification name, this record allows user by multiple mapping names to same computer.
May be used for needing to point to same station server IP when having multiple domain name, now just a domain name can be done A record sensing server ip, then other domain name is called in domain name that (i.e. CNAME) record to A; When the IP address of server occurs to change, just can do change to domain name one by one to have pointed to, only need that domain name changing A record on the new IP of server, the sensing of those domain names that other are called (i.e. CNAME) will be changed on new IP address automatically.A (Address) record is used to IP address record corresponding to given host name (or domain name), Website server under this domain name can be directed on the web page server (webserver) of oneself by user, also can arrange the subdomain name of domain name simultaneously.
At present, specify in the district of name server, there is a CNAME resource record in DNS Protocol.Under the background that the demand of domain name resources addressing constantly expands, this agreement regulation can not meet domain name system and CDN (ContentDeliveryNetwork, i.e. content distributing network) etc. the performance requirement of load balancing in new solution, also further challenge is proposed to Consumer's Experience and domain name system security etc. such as the fast accesses of user.
Summary of the invention
For the defect of prior art, the invention provides a kind of DNS name resolution method based on CNAME, with the problem that the load-balancing performance and service that solve domain name mapping in original DNS SiteServer LBS are of low quality.
For solving the problem, the technical solution used in the present invention is as follows:
1, based on a DNS name resolution method of CNAME, the method comprises:
Multiple canonical name is arranged to single domain name, and priority is arranged to above-mentioned canonical name;
In the content distribution network system of different regions, probe node is set respectively;
Weight is set by poll or detection, or selects, to determine and to select the content distributing network with optimal service performance in above-mentioned multiple different content distributing network by arranging at described poll and detection the method preferentially switched in weight;
Recursion server switches, the content distributing network response inquiry of the domain name making this have optimal service performance.
2, domain name analytic method as claimed in claim 1, is characterized in that, comprises: first carry out poll by server, determine a preferred sequence by arranging at described poll and detection the method preferentially switched in weight; Detection arranges weight again, draws different weights, to determine a preferred sequence, afterwards by out of kilter method, arranges in the preferred sequence obtained respectively weight, select the content distributing network with optimal service performance, and switch from above-mentioned poll and detection.
3, domain name analytic method as claimed in claim 1 or 2, it is characterized in that, described poll comprises, recursion server conducts interviews to multiple different content distributing network, and according to the round-trip delay of accessing first, content distributing network being screened, according to screening the priority determined, content distributing network being conducted interviews inquiry.
4, domain name analytic method as claimed in claim 1 or 2, it is characterized in that, the method that described detection arranges weight comprises, priority is arranged to the multiple canonical names occurred in area file, according to priority, draw multiple content distributing network weight separately respectively, then according to the height of the weight of canonical name, recursion server to conduct interviews inquiry to the content distributing network chosen.
5, domain name analytic method as claimed in claim 3, it is characterized in that, round-trip delay is shorter, determines that its priority is more forward.
6, domain name analytic method as claimed in claim 4, it is characterized in that, determine that the weight height of the content distributing network in certain region above-mentioned adopts following formula to draw: Pi=∑ ((1*P1+2*P2+3*P3+ ... + n*Pn)/(1+2+3+ ... + n)), wherein, n is the content distributing network number arranged.
A kind of DNS name resolution method based on CNAME disclosed in this invention, by realizing arranging multiple CNAME, and priority is set, by arranging probe node at the CDN in different areas, by poll, the strategy such as weight and out of kilter method is set, determine the CDN of optimal service performance, then switch, the CDN with optimal service performance is made to respond inquiry of the domain name, thus improve the performance of domain name service and Consumer's Experience, and improve the fail safe of name server, maintainability and reliability.
Accompanying drawing explanation
Fig. 1 is the process principle figure based on the DNS name resolution method of CNAME in a preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, but not as a limitation of the invention.
See Fig. 1, embodiments provide a kind of DNS name resolution method based on CNAME, before introducing the method for the embodiment of the present invention, description below carried out to following noun:
CNAME refers to that canonical name is also referred to as specification name.This record allows you by multiple mapping names to same computer.Be generally used for the computer simultaneously providing WWW and MAIL to serve.Such as, a computer name is had to be " r0WSPFSx58. " (A record).It provides WWW and MAIL to serve simultaneously, for the ease of user's access services.Can be this computer installation two alias (CNAME): WWW and MAIL.The full name of this two alias is " r0WSPFSx58.baihuikm.com " and " zz.baidu.com ".In fact they point to " zz.baidu.com ".
Domain name mapping is exactly the transfer process of domain name to IP address.IP address is numeric address networking identifying your website, and in order to simple and easy to remember, adopt domain name to replace ip address designation site address, the parsing work of domain name is completed by dns server.
A record is used to IP address record corresponding to given host name (or domain name).Website server under this domain name can be directed on the webserver of oneself by user, also can arrange the second level domain of this domain name simultaneously.
CNAME record, that is: canonical name.This record allows you by multiple mapping names to same computer.Be generally used for the computer simultaneously providing WWW and MAIL to serve.Such as, a computer name is had to be " host.mydomain.com " (A record).It provides WWW and MAIL to serve simultaneously, for the ease of user's access services.Can be this computer installation two alias (CNAME): WWW and MAIL.
Content distributing network (CDN) is a kind of new network building mode, and it is the network coverage layer for optimizing especially at traditional IP network issue broadband rich-media; Briefly, content distributing network (CDN) is a total system disposed through tactic, comprise redirected and Content Management 4 important documents of distributed storage, load balancing, network request, load balancing is the core of whole CDN, and the accuracy and efficiency of load balancing directly determines efficiency and the performance of whole CDN.The flow of network is assigned to several server or the enterprising row relax of network node that can complete same task by load-balancing technique as far as possible equably, avoid subnetwork node overload and the unfavorable situation of another part node free time, both network traffics can be improved, the overall performance of network can be improved again, by the judgement of user's close and server load, CDN guarantees that content provides service with a kind of very efficiently request that mode is user.
RTT (Round-TripTime): round-trip delay.It is important performance index in a computer network, represents from transmitting terminal sends data, receives the confirmation (receiving terminal just sends confirmation after receiving data immediately) from receiving terminal, the time delay altogether experienced to transmitting terminal.
DNS name resolution method based on CNAME disclosed in this invention specifically comprises:
Multiple canonical name is arranged to single domain name, and priority is arranged to above-mentioned canonical name;
In the content distribution network system of different regions, probe node is set respectively;
Weight is set by poll or detection, or selects, to determine and to select the content distributing network with optimal service performance in above-mentioned multiple different content distributing network by arranging at described poll and detection the method preferentially switched in weight;
Recursion server switches, the content distributing network response inquiry of the domain name making this have optimal service performance.
Wherein, in inventive embodiments, there are three kinds of modes to the optimum selecting of CDN, mode one: adopt poll method preferentially; Mode two: adopt detection that weight method is preferentially set; Mode three: adopt poll preferentially weight method to be preferentially set with detection respectively successively, determine in the two there is the CDN of optimal service performance after, freely switching of both realizations.By above-mentioned three kinds of modes preferentially, improve performance and the Consumer's Experience of domain name service.
Wherein, in the above-mentioned methods, the method for described poll comprises, recursion server conducts interviews to multiple different content distributing network, and according to the round-trip delay of accessing first, content distributing network is screened, according to screening the priority determined, content distributing network is conducted interviews inquiry.Wherein, round-trip delay is shorter, determines that its priority is more forward.
Wherein, in the above-mentioned methods, the described method arranging weight comprises, priority is arranged to the multiple canonical names occurred in area file, according to priority, draw multiple content distributing network weight separately respectively, then according to the height of the weight of canonical name, recursion server to conduct interviews inquiry to the content distributing network chosen.Determine that the weight height of the content distributing network in certain region above-mentioned adopts following formula to draw: Pi=∑ ((1*P1+2*P2+3*P3+ ... + n*Pn)/(1+2+3+ ... + n)), wherein, n is the number that content distributing network is arranged.
Such as, suppose to have the CDN that three different, be respectively C1, C2, C3, the priority of C1, C2, C3 is respectively 1,2,3, then the priority of these three CDN and weight are respectively C1 (1,1/1+2+3), C2 (2,2/1+2+3), C3 (3,3/1+2+3).
The step adopting mode three of the present invention preferentially freely to switch is as follows:
(1) poll
Recursion server conducts interviews to multiple different CDN.RTT according to access carries out preferably to CDN, then to conduct interviews inquiry to CDN according to preference ordering.
(2) detection arranges weight
CDN in different cities disposes probe node, and the result according to detection arranges priority to different CDN, then draws the weight of different CDN;
(3) preferentially
By out of kilter method, in multiple different CDN, determine the CDN of optimal service performance.If have Beijing CDN node P1, Shanghai CDN node P2, Chengdu CDN node P3 ..., Shenyang CDN node Pn, then the weight of different CDN node can be drawn by formula: Pi=∑ ((1*P1+2*P2+3*P3+ ... + n*Pn)/(1+2+3+ ... + n)).
(4) according to the CDN with optimal service performance that upper step is determined, recursion server carries out switching CDN.
The present invention is by arranging multiple CNAME to single domain name, and priority is arranged to these CNAME record, by arranging probe node at the CDN in different areas, by poll, the strategy such as weight and out of kilter method is set, determine the CDN of optimal service performance, then switch, make the CDN with optimal service performance respond inquiry of the domain name, improved the raising of domain name service performance and the lifting of user side experience.
Although below invention has been described in conjunction with the preferred embodiments, but it should be appreciated by those skilled in the art, method and system of the present invention is not limited to the embodiment described in embodiment, when not deviating from the spirit and scope of the invention be defined by the appended claims, can various amendment, increase be made to the present invention and replace.
Claims (6)
1., based on a DNS name resolution method of CNAME, it is characterized in that, the method comprises:
Multiple canonical name is arranged to single domain name, and priority is arranged to above-mentioned canonical name;
In the content distribution network system of different regions, probe node is set respectively;
Weight is set by poll or detection, or selects, to determine and to select the content distributing network with optimal service performance in above-mentioned multiple different content distributing network by arranging at described poll and detection the method preferentially switched in weight;
Recursion server switches, the content distributing network response inquiry of the domain name making this have optimal service performance.
2. domain name analytic method as claimed in claim 1, is characterized in that, comprises: first carry out poll by server, determine a preferred sequence by arranging at described poll and detection the method preferentially switched in weight; Detection arranges weight again, draws different weights, to determine a preferred sequence, afterwards by out of kilter method, arranges in the preferred sequence obtained respectively weight, select the content distributing network with optimal service performance, and switch from above-mentioned poll and detection.
3. domain name analytic method as claimed in claim 1 or 2, it is characterized in that, described poll comprises, recursion server conducts interviews to multiple different content distributing network, and according to the round-trip delay of accessing first, content distributing network being screened, according to screening the priority determined, content distributing network being conducted interviews inquiry.
4. domain name analytic method as claimed in claim 1 or 2, it is characterized in that, the method that described detection arranges weight comprises, priority is arranged to the multiple canonical names occurred in area file, according to priority, draw multiple content distributing network weight separately respectively, then according to the height of the weight of canonical name, recursion server to conduct interviews inquiry to the content distributing network chosen.
5. domain name analytic method as claimed in claim 3, it is characterized in that, round-trip delay is shorter, determines that its priority is more forward.
6. domain name analytic method as claimed in claim 4, it is characterized in that, determine that the weight height of the content distributing network in certain region above-mentioned adopts following formula to draw: Pi=∑ ((1*P1+2*P2+3*P3+ ... + n*Pn)/(1+2+3+ ... + n)), wherein, n is the content distributing network number arranged.
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| CN105959433A (en) * | 2016-07-22 | 2016-09-21 | 无锡华云数据技术服务有限公司 | Domain name resolution method and domain name resolution system |
| CN106301966A (en) * | 2016-10-25 | 2017-01-04 | 北京云端智度科技有限公司 | A kind of method of pro-rata flow based on domain name |
| CN106506726A (en) * | 2016-12-12 | 2017-03-15 | 北京云端智度科技有限公司 | A kind of method of verification DNS real users |
| CN106533762A (en) * | 2016-11-17 | 2017-03-22 | 贵州白山云科技有限公司 | Device switching method and device switching device |
| CN106657432A (en) * | 2016-11-17 | 2017-05-10 | 中国移动通信集团江苏有限公司 | Domain name resolution method and device |
| CN107360273A (en) * | 2017-09-11 | 2017-11-17 | 深圳市茁壮网络股份有限公司 | A kind of domain name analytic method and device |
| CN107734080A (en) * | 2017-10-09 | 2018-02-23 | 厦门二五八网络科技集团股份有限公司 | Multi-user's domain name mapping and the method for name server migration |
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| CN107734080A (en) * | 2017-10-09 | 2018-02-23 | 厦门二五八网络科技集团股份有限公司 | Multi-user's domain name mapping and the method for name server migration |
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| CN108881516A (en) * | 2018-07-27 | 2018-11-23 | 网宿科技股份有限公司 | A kind of method and apparatus for dispatching more CDN service systems |
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| CN109936632A (en) * | 2019-03-07 | 2019-06-25 | 杭州又拍云科技有限公司 | A kind of CNAME accelerated method applied to DNS authority server |
| CN109936632B (en) * | 2019-03-07 | 2021-12-21 | 杭州又拍云科技有限公司 | CNAME acceleration method applied to DNS authoritative server |
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| CN110213398B (en) * | 2019-05-30 | 2021-10-08 | 腾讯科技（深圳）有限公司 | Alias management method, device, server and storage medium |
| CN112182070A (en) * | 2020-10-13 | 2021-01-05 | 安徽极玩云科技有限公司 | Elasticissearch query management system based on cloud computing |
| CN112182070B (en) * | 2020-10-13 | 2022-06-14 | 安徽极玩云科技有限公司 | Elasticissearch query management system based on cloud computing |
| CN114422476A (en) * | 2021-12-28 | 2022-04-29 | 互联网域名系统北京市工程研究中心有限公司 | Method and device for preventing CNAME cache pollution |
| CN114422476B (en) * | 2021-12-28 | 2023-09-22 | 互联网域名系统北京市工程研究中心有限公司 | Method and device for preventing CNAME (CNAME) cache pollution |
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