CN105516391B - A kind of DNS name resolution method based on CNAME - Google Patents
A kind of DNS name resolution method based on CNAME Download PDFInfo
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- CN105516391B CN105516391B CN201510993981.9A CN201510993981A CN105516391B CN 105516391 B CN105516391 B CN 105516391B CN 201510993981 A CN201510993981 A CN 201510993981A CN 105516391 B CN105516391 B CN 105516391B
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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 field of computer technology, disclose a kind of DNS name resolution method based on CNAME, comprising: which multiple CNAME are arranged by realizing, and priority is set, by the CDN in different areas, probe node is set, it is tactful by poll, setting weight and out of kilter method etc., determine the CDN of optimal service performance, then it switches over, so that the CDN with optimal service performance responds inquiry of the domain name.Method of the invention can be improved the performance and user experience of domain name service, and improve safety, maintainability and the reliability of name server.
Description
Technical field
The present invention relates to field of computer technology, in particular to a kind of DNS name resolution method based on CNAME.
Background technique
In DNS (Domain Name System, domain name system), there is a area in each authoritative name server
File, including the various domain name datas stored in the form of resource record.Wherein, CNAME refers to canonical name, also referred to as advises
Model name, this record allow user that multiple names are mapped to same computer.
Can be used for, which ought possess multiple domain names, needs to be directed toward same server ip, a domain name can be A at this time
Record is directed toward server ip, then does other domain names in the domain name that alias (i.e. CNAME) is recorded to A；As the IP of server
When address is changed, so that it may direction need not be altered to domain name one by one, it is only necessary to change that domain name of A record
Onto the new IP of server, other directions for doing those of alias (i.e. CNAME) domain name will be changed to automatically in new IP address.A
(Address) record is used to refer to determine the corresponding IP address record of host name (or domain name), and user can be by the net under the domain name
Site server is directed on the web page server (web server) of oneself, while the subdomain name of domain name also can be set.
Currently, providing in DNS Protocol, there can only be a CNAME resource record in the area of name server.In domain name resources
Under the ever-expanding background of the demand of addressing, this agreement regulation is no longer satisfied domain name system and CDN (Content
Delivery Network, i.e. content distributing network) etc. the performance requirement of load balancing in new solutions, also to the fast of user
The user experiences and domain name system security etc. such as speed access propose further challenge.
Summary of the invention
In view of the drawbacks of the prior art, the DNS name resolution method based on CNAME that the present invention provides a kind of, to solve
The load-balancing performance of the domain name mapping problem of low quality with service in original DNS SiteServer LBS.
To solve the above problems, The technical solution adopted by the invention is as follows: a kind of DNS name resolution side based on CNAME
Method, this method comprises:
Multiple canonical names are arranged to single domain name, and priority is arranged to above-mentioned canonical name；
Probe node is respectively set in the content distribution network system of different regions；
By poll or detection setting weight, or by preferentially being switched in the poll and detection setting weight
Method selected, with determine and select in above-mentioned multiple and different content distributing network have optimal service performance in
Content distributing network；
Recursion server switches over, so that this has the content distributing network response inquiry of the domain name of optimal service performance.
2, domain name analytic method as described in claim 1, which is characterized in that by the poll and detection setting power
The method preferentially switched in weight includes: first to be polled by server, determines a preferred sequence；Setting weight is detected again,
Obtain different weights, to determine a preferred sequence, afterwards by out of kilter method, from above-mentioned poll and detection setting weight respectively
In obtained preferred sequence, the content distributing network with optimal service performance is selected, and switch over.
3, domain name analytic method as claimed in claim 1 or 2, which is characterized in that the poll includes recursion server
It accesses to multiple and different content distributing networks, and according to the round-trip delay accessed for the first time, content distributing network is carried out
Screening accesses inquiry to content distributing network according to the determining priority of screening.
4, domain name analytic method as claimed in claim 1 or 2, which is characterized in that the method for the detection setting weight
Including obtaining multiple content delivery networks respectively according to priority to the multiple canonical names setting priority occurred in area file
The respective weight of network, then according to the height of the weight of canonical name, recursion server carries out the content distributing network chosen
Access queries.
5, domain name analytic method as claimed in claim 3, which is characterized in that round-trip delay is shorter, determines that it is preferential suitable
Sequence is more forward.
6, domain name analytic method as claimed in claim 4, which is characterized in that determine the content delivery network in certain above-mentioned region
The weight height of network is obtained using following formula: Pi=∑ ((1*P1+2*P2+3*P3+ ...+n*Pn)/(1+2+3+ ...+n)),
In, n is the content distributing network number of setting.
Multiple CNAME are arranged by realizing in a kind of DNS name resolution method based on CNAME disclosed in this invention, and
Priority is set, probe node is arranged by the CDN in different areas, passes through poll, the setting plans such as weight and out of kilter method
Slightly, it determines the CDN of optimal service performance, then switches over, so that the CDN with optimal service performance responds inquiry of the domain name,
To improve the performance and user experience of domain name service, and improve safety, maintainability and the reliability of name server.
Detailed description of the invention
Fig. 1 is the process principle figure of the DNS name resolution method based on CNAME in a preferred embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, but not as
Limitation of the invention.
Referring to Fig. 1, the DNS name resolution method based on CNAME that the embodiment of the invention provides a kind of is introducing the present invention
Before the method for embodiment, description below is carried out to following nouns:
CNAME refers to that canonical name is also referred to as specification name.This record allows you that multiple names are mapped to same
Computer.Commonly used in providing the WWW and MAIL computer of service simultaneously.For example, there is a computer name to be
" r0WSPFSx58. " (A record).It provides WWW and MAIL service simultaneously, accesses and services for the ease of user.It can be the meter
Two alias (CNAME) is arranged in calculation machine: WWW and MAIL.The full name of the two alias is " r0WSPFSx58.baihuikm.com "
" zz.***.com ".Actually they all point to " zz.***.com ".
Domain name mapping is exactly conversion process of the domain name to IP address.IP address is that your website is identified on network digitally
Location replaces the address ip to identify site address in order to simple and easy to remember using domain name, and the parsing work of domain name is complete by dns server
At.
A record is used to refer to determine the corresponding IP address record of host name (or domain name).User can be by the net under the domain name
Site server is directed on the web server of oneself, while the second level domain of the domain name also can be set.
CNAME record, it may be assumed that canonical name.This record allows you that multiple names are mapped to same computer.Usually
For providing the WWW and MAIL computer of service simultaneously.For example, having a computer name is " host.mydomain.com " (A
Record).It provides WWW and MAIL service simultaneously, accesses and services for the ease of user.It can be two alias of computer installation
(CNAME): WWW and MAIL.
Content distributing network (CDN) is a kind of new network building mode, it is for that can issue broadband in traditional IP network
Rich-media and the network coverage layer especially optimized；Briefly, content distributing network (CDN) is one and disposes through tactic
Total system, including 4 distributed storage, load balancing, the redirection of network request and Content Management important documents, load balancing is
The core of entire CDN, the accuracy and efficiency of load balancing directly determine the efficiency and performance of entire CDN.Load balancing skill
The flow of network is assigned to as homogeneously as possible and several can complete on the server or network node of same task by art
Reason avoids subnetwork node overload and the deleterious situation of another part node free time, not only can be improved network flow, but also can be with
The overall performance for improving network, by the judgement of user's close and server load, CDN ensures content with a kind of extremely efficient
Mode provide service for the request of user.
RTT (Round-Trip Time): round-trip delay.It is an important performance indicator, table in a computer network
Show since transmitting terminal sends data, receives the confirmation from receiving end to transmitting terminal and (soon sent out after receiving data receiving end
Send confirmation), the time delay undergone in total.
DNS name resolution method disclosed in this invention based on CNAME specifically includes:
Multiple canonical names are arranged to single domain name, and priority is arranged to above-mentioned canonical name；
Probe node is respectively set in the content distribution network system of different regions；
By poll or detection setting weight, or by preferentially being switched in the poll and detection setting weight
Method selected, with determine and select in above-mentioned multiple and different content distributing network have optimal service performance in
Content distributing network；
Recursion server switches over, so that this has the content distributing network response inquiry of the domain name of optimal service performance.
Wherein, in inventive embodiments, to the optimum selecting of CDN, there are three types of mode, modes one: using the side of poll preferentially
Method；Mode two: using the method for detection setting weight preferentially；Mode three: it is successively preferentially weighed respectively with detection setting using poll
The method of weight preferentially realizes the free switching of the two after determining the CDN with optimal service performance in the two.By upper
Three kinds of modes preferentially are stated, to improve the performance and user experience of domain name service.
Wherein, in the above-mentioned methods, the method for the poll includes that recursion server is to multiple and different content delivery networks
Network accesses, and according to the round-trip delay accessed for the first time, screens to content distributing network, according to the preferential of screening determination
Sequence accesses inquiry to content distributing network.Wherein, round-trip delay is shorter, determines that its priority is more forward.
Wherein, in the above-mentioned methods, it is described setting weight method include, to the multiple canonical names occurred in area file
Priority is set, the respective weight of multiple content distributing networks is obtained, then according to the power of canonical name according to priority respectively
The height of weight, recursion server access inquiry to the content distributing network chosen.Determine the content distribution in certain above-mentioned region
The weight height of network is obtained using following formula: Pi=∑ ((1*P1+2*P2+3*P3+ ...+n*Pn)/(1+2+3+ ...+n)),
Wherein, n is the number of content distributing network setting.
For example, it is assumed that there are three different CDN, respectively C1, C2, C3, the priority of C1, C2, C3 are respectively 1,2,3,
Then the priority and weight of these three CDN is respectively C1 (1,1/1+2+3), C2 (2,2/1+2+3), C3 (3,3/1+2+3).
Using mode three of the present invention preferentially free switching the step of it is as follows:
(1) poll
Recursion server accesses to multiple and different CDN.CDN is carried out preferably according to the RTT of access, then basis
Preference ordering accesses inquiry to CDN.
(2) detection setting weight
CDN in different cities disposes probe node, priority is arranged to different CDN according to the result of detection, then
Obtain the weight of different CDN；
(3) preferentially
By out of kilter method, the CDN of optimal service performance is determined in multiple and different CDN.If there is Beijing CDN node
P1, Shanghai CDN node P2, Chengdu CDN node P3 ..., Shenyang CDN node Pn, then the weight of different CDN nodes can lead to
It crosses formula to obtain: Pi=∑ ((1*P1+2*P2+3*P3+ ...+n*Pn)/(1+2+3+ ...+n)).
(4) CDN with optimal service performance determined according to upper step, recursion server switch over CDN.
The present invention records setting priority to these CNAME by the way that multiple CNAME are arranged to single domain name, by
Probe node is arranged in the CDN in different areas, tactful by poll, setting weight and out of kilter method etc., determines optimal service
The CDN of energy, then switches over, so that the CDN with optimal service performance responds inquiry of the domain name, has improved domain name service performance
Raising and user terminal experience promotion.
Although combining preferred embodiment above, invention has been described, it should be appreciated by those skilled in the art,
Method and system of the present invention is not limited to embodiment described in specific embodiment, wants without departing substantially from by appended right
Ask book limit spirit and scope of the invention in the case where, can to the present invention various modification can be adapted, increase and replacement.
Claims (5)
1. a kind of DNS name resolution method based on CNAME, which is characterized in that this method comprises:
Multiple canonical names are arranged to single domain name, and priority is arranged to above-mentioned canonical name；
Probe node is respectively set in the content distribution network system of different regions；
By poll or detection setting weight, or the side by preferentially being switched in the poll and detection setting weight
Method is selected, to determine and select the content with optimal service performance in above-mentioned multiple and different content distributing network point
Hairnet network；
Recursion server switches over, so that this has the content distributing network response inquiry of the domain name of optimal service performance；
It include: first to be polled by server by the method preferentially switched in the poll and detection setting weight,
Determine a preferred sequence；Setting weight is detected again, obtains different weights, to determine a preferred sequence, passes through out of kilter method afterwards,
From the preferred sequence respectively obtained in above-mentioned poll and detection setting weight, the content distribution with optimal service performance is selected
Network, and switch over.
2. domain name analytic method as described in claim 1, which is characterized in that the poll includes that recursion server is to multiple
Different content distributing networks access, and according to the round-trip delay accessed for the first time, screen to content distributing network, root
It accesses inquiry according to the determining priority of screening to content distributing network.
3. domain name analytic method as described in claim 1, which is characterized in that the method for the detection setting weight includes, right
The multiple canonical names setting priority occurred in area file obtains multiple content distributing networks respectively according to priority respectively
Weight, then according to the height of the weight of canonical name, recursion server accesses to the content distributing network chosen and looks into
It askes.
4. domain name analytic method as claimed in claim 2, which is characterized in that round-trip delay is shorter, determines that its priority is got over
It is forward.
5. domain name analytic method as claimed in claim 3, which is characterized in that determine the content distributing network in certain above-mentioned region
Weight height is obtained using following formula: Pi=∑ ((1*P1+2*P2+3*P3+ ...+n*Pn)/(1+2+3+ ...+n)), wherein n
For the content distributing network number of setting.
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| CN106301966B (en) * | 2016-10-25 | 2019-08-06 | 北京云端智度科技有限公司 | A method of the proportional assignment flow based on domain name |
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| CN112104498B (en) * | 2016-11-17 | 2023-04-07 | 贵州白山云科技股份有限公司 | DNS service quality evaluation method, device, medium and equipment |
| 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 |
| CN108243266A (en) * | 2016-12-27 | 2018-07-03 | 阿里巴巴集团控股有限公司 | Canonical name processing method, configuration 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 |
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