CN108989487A - CDN Optimization Scheduling based on local dns - Google Patents
CDN Optimization Scheduling based on local dns Download PDFInfo
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- CN108989487A CN108989487A CN201811039456.3A CN201811039456A CN108989487A CN 108989487 A CN108989487 A CN 108989487A CN 201811039456 A CN201811039456 A CN 201811039456A CN 108989487 A CN108989487 A CN 108989487A
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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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- Computer Networks & Wireless Communication (AREA)
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- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention relates to a kind of CDN Optimization Scheduling based on local dns, comprising: ICP content user experiences optimization system and internet content user experience optimization system；ICP content user experience optimization system is the domain name often accessed for user, by the authoritative domain name server for disposing ICP by ICP user experience optimization system, it is ICP authoritative domain name server address that forwarding server is configured in ICP user experience optimization system, it is directly forwarded by domain name and carries out resource acquisition, local testing result is obtained by safe plan global resources library, in conjunction with the strategy of user, optimal the Resources list is returned.Promote user experience；Promote local dns service ability；Defect content source second grade switching；Save provider backbone bandwidth；User demand responds nearby, on the one hand improves the access experience of user, improves the competitiveness of operator；On the other hand the backbone bandwidth for dramatically saving operator's uplink, saves the cost of operator.
Description
Technical field
The present invention relates to internet areas, in particular to a kind of CDN Optimization Scheduling based on local dns.
Background technique
Dns resolution is that we access Internet " first jumps ", in order to which faster, more surely, present industry generallys use
Intelligent DNS parses.Intelligent DNS parsing is the important component of CDN, and principle is exactly the list item saved according to itself
The host record of the corresponding next nearest distribution server in the position of IP and user is to user, i.e., according to the source pair of request user
Same domain name makes corresponding different parsing.In CDN network, GSLB global load balancing is realized according to intelligent DNS, is divided nearby
Send out cache server demandable, so the scheduling accuracy of CDN needs the intelligently parsing by DNS.
But intelligent DNS is also not perfectly, because DNS is the agreement more early designed on internet, is not examined at that time
Consider the development and application scenarios of network today.By taking client request DNS query www.163.com domain name as an example, more early
Traditional DNS workflow it is as follows:
(1) local dns server that client is configured to the machine issues the DNS query request of " www.163.com " domain name.
(2) after local dns server receives request, if there is no the record of the domain name in local cache, local dns clothes
Same DNS domain name inquiry request is issued root name server with the role of DNS client again by business device；Root name server is received
To after DNS request, com top-level name server address corresponding to the com top level domain in requested DNS domain name is returned
To local dns server.
(3) the com top-level name server address that local dns server is returned according to root name server, to correspondence
Com top-level name server send the DNS query request of " www.163.com " domain name as before；It is corresponding top
Name server, if not having the record of the domain name in caching, returns after receiving DNS query request to local dns server
Return the corresponding 163.com second level name server address (Authoritative DNS server address) of requested DNS domain name.
(4) the 163.com second level name server that local dns server is returned according to com top level domain server is weighed
Prestige dns server address sends www.163.com domain name as before to corresponding 163.com Authoritative DNS server
DNS query request；Corresponding 163.com Authoritative DNS server returns to IP address corresponding to www.163.com domain name to local
Dns server.
(5) local dns server will be corresponding to the www.163.com domain name that obtained in 163.com Authoritative DNS server
IP address returns to DNS client.
In entire resolving, local dns server replaces user Xiang Gen, top level domain, Authoritative DNS server to go to inquire
As a result and user is returned result to, the Authoritative DNS server being queried is can not to know that specifically which user inquires, nothing
Method obtains User IP.CDN obtains inquiry IP using DNS, carries out ground domain scheduling, but the IP address obtained here to user according to IP
It is dns address, rather than the true IP address of user.In most cases, user will use the local nearest from oneself network
Dns server, CDN scheduling are basic or accurate.But nameserver setting mistake is also had many consumers, or use
Google public dns (nameserver 8.8.8.8/8.8.4.4) or opendns carries out dns resolution.If we
Local dns server and local user be not on a geographical location, then user can obtain a local dns server place
The nearest IP address in position rather than the nearest IP address of user location are inevitably deposited so can not precisely be dispatched
In scheduling error, user accesses the phenomenon of experience difference.
Based on the problem of CDN scheduling inaccuracy, google has submitted a DNS Extended Protocol (EDNS), allows DNS
Resolver transmits the IP address of real user to Authoritative DNS server.EDNS is exactly to follow existing DNS message format
On the basis of increase some fields to support more DNS request business.
A kind of new pseudo- resource record OPT (Resource Record) is introduced in EDNS, why is called pseudo- resource note
Record is because it does not include any DNS data, and OPT RR cannot be buffered, cannot be forwarded, cannot be stored in zone file
In.OPT is placed in the region Additional data of DNS communicating pair (requestor and responsor) DNS message.
Content in OPT puppet resource record includes fixed part and variable part, its structure is as follows: shown in Fig. 2.
Nethermost RDATA is variable part in Fig. 2, remaining part is all fixed part:
Name field is empty at present；
TYPE field is the type number of OPT RR.IANA is 41 (0x29) for its distribution；
It is the DNS message header of extension in TTL；
RDLEN is the length of variable part RDATA；
RDATA is the variable part of KV type.
Ttl field originally is used to RCODE and flags in storage extension message header, its format such as Fig. 3 institute
Show.
8 bit of a high position are extension RCODE (returning to status code) in Fig. 3, this 8 bit add the 4bit on the head DNS in total
There is 12bit (8bit is in a high position), can thus indicate more return types.
VERSION field indicates the version of EDNS (EDNS has many versions according to the different extension content of support).
The result of variable part RDATA is as shown in Figure 4 in OPT RR:
OPTION-CODE:2 byte (latest definition is 0 × 0008 in RFC, and boss's sheet is 0x50fa)；
OPTION-LENGTH:2 byte describes the content-length (BYTE) after it；
FAMILY:2 byte, 1 indicates ipv4, and 2 indicate ipv6；
ADDRESS: the place of practical storage IP address, ipv4 length are 4；
The inquiry packet that EDNS could be sent after BIND cannot support EDNS to need patch installing at present, please first downloads ends-
Client-subnet dig patch is simultaneously installed into BIND.The domain name mapping that test domain name is first done to multi-line, such as Fig. 5 institute
Show..
Respectively edns.dns.com has done two DNS intelligently parsings, is resolved to respectively from the user of Shanghai Telecom
3.3.3.3, the user of Beijing Telecom is resolved to 2.2.2.2, and others are all resolved to 1.1.1.1.
It is inquired using the DIG for beating edns-clinet-subnet patch, shown in Fig. 6..
Corresponding route parsing, such as Fig. 7 can be correctly returned when client is 180.149.128.1 (Shanghai Telecom IP)
It is shown.
Corresponding route parsing can also be correctly returned when client is 58.32.1.1 (Beijing Telecom IP).
Disadvantage of the existing technology, can solve current CDN using ECS (edns-client-subnet) cannot be accurate
The problem of scheduling, but require relatively high to the transformation of existing net, need cache server, recursion server all to support ECS.Performance side
Face, with the increase of domain name amount, ECS scheme also can be increasing on the influence of the performance of existing net DNS.
Disadvantage of the existing technology is as follows: the targeted website of user's access, may there is many resources in internet,
But due to lacking the scheduling based on user experience, the resource of user's access be not necessarily it is current they to access experience best, very
Not the problems such as such as page is not opened to appearance, and other users can normally access.Network/O&M department can not be fine
Solve the problems, such as, user experience is unable to get guarantee, and then influences the behavior of user.With the high speed development of internet, it interconnects
Net content is also more and more abundant, for example the user of the applications such as webpage, game, wechat, video, live streaming is more and more.User is to band
Wide occupancy and demand is increasing, causes the congestion of provider backbone network bandwidth.Finally affect the experience of user, resistance
The development of Ai Liao operator broadband services.Flow can not accurately be dispatched, ECS slow to defect content source switch speed
It will increase the variation of network structure and influence the performance of DNS.
Summary of the invention
In view of the deficiency of the prior art, the present invention provide a kind of promotion user experience, save backbone bandwidth,
Realize the CDN Optimization Scheduling based on local dns of flow precisely dispatched.
The technical solution used in the present invention is:
A kind of CDN Optimization Scheduling based on local dns,
It include: ICP content user experience optimization system and internet content user experience optimization system；
Wherein ICP content user experience optimization system is the domain name often accessed for user, by ICP user experience
The authoritative domain name server of deployment ICP by optimization system, it is ICP that forwarding server is configured in ICP user experience optimization system
Authoritative domain name server address is directly forwarded by domain name and carries out resource acquisition, and no longer carries out recurrence；
Internet content user experience optimization system is other domain names except the ICP seldom accessed for user, is passed through
Safe plan global resources library obtain local testing as a result, in conjunction with user strategy, return to optimal the Resources list.
The workflow of the ICP content user experience optimization system is as follows:
ICP content user is disposed before local cache dns server and experiences optimization system, and ICP authoritative domain name is disposed on side
Server, wherein ICP content user experience optimization system is that logic is preposition, can also be deployed directly into local cache dns server
On.
ICP content user experience optimization system can the request domain name to user distinguish, the request of ICP domain name directly turns
Be dealt into side dispose ICP authoritative domain name server go solution new record, and will parsing conclusion return to ICP content user experience it is excellent
Change system, optimization system return to user, and user accesses optimal resource according to parsing result.The request of other domain names directly turns
It goes to parse to local cache dns server.
ICP content user experiences optimization system and supports ECS, and DNS request when can carry the source IP of user, and ICP is awarded
Weighing name server can guide user to nearest resource according to the source IP address of user.
For domain name: the domain name that user often accesses；
Deployment mode: logic is preposition, i.e., on local cache dns server or deployment safe plan ICP user experience in front end is excellent
Change system, and ICP authoritative domain name server is disposed nearby；
Scheduling mode: shunt, authorization nearby parsing, user directly in response to；
User's access: existing content node (provincial capital IDC), districts and cities' content node；
System reliability: forwarding switch, own services detection.
ICP content user experiences optimization system and ECS, DNS request packet is supported to carry the source IP address of user, ICP authorization clothes
Business device is configured with different solution new records to same domain name according to different source IP users, and ICP authorization server can basis
True client IP address returns to optimal solution new record, realizes accurately scheduling of resource, realizes the real nearest resource of user
Access, improve user access experience.
ICP authoritative domain name server is disposed in ICP content user experience optimization system, experiences and optimizes in ICP content user
The forwarding server address that common ICP domain name is configured in system is ICP authoritative domain name server address.
It realizes parsing nearby, saves away the time loss of recursion resolution, promote user experience, and only need ICP content
User experience optimization system support ECS can, overcome traditional ECS needs cache server, recursion server all
The problem of needing support ECS requires the network rebuilding low.
The present invention compared with the prior art the utility model has the advantages that
1. promoting user experience；
ICP authoritative domain name server is disposed nearby, is deployed directly into operator's local dns side, without recurrence of going out, just
Closely directly return to solution new record.
2. domain name shunts, local dns service ability is promoted；
ICP domain name and other domain names are divided into the domain name of request, the ICP domain name that most of frequentation is asked directly is passed through
ICP authoritative domain name server parses nearby, other domain names of remaining minority are parsed by local dns server, alleviates this
The parsing pressure of ground dns server, improves local dns server ability.
3. defect content source second grade switching；
It goes to parse since ICP content user experience optimization system directly passes through the ICP authoritative domain name server that side is disposed
And solution new record is not cached, when service server breaks down, ICP authoritative domain name server just will be deleted the failed server
Corresponding record, user would not return again to the address of failed server when parsing, but it is normal to return to service state
Service server address, realize defect content source second grade switching.
4. saving provider backbone bandwidth；
User demand responds nearby, on the one hand improves the access experience of user, improves the competitiveness of operator；It is another
Aspect dramatically saves the backbone bandwidth of operator's uplink, saves the cost of operator.
Detailed description of the invention
Fig. 1 is traditional dns resolution flow diagram；
The OPT content schematic diagram that Fig. 2 is；
Fig. 3 is extended RCODE and flags Detail schematic diagram；
Fig. 4 is RDATA structural schematic diagram；
Fig. 5 is the record configuration diagram of edns.dns.com；
Fig. 6 is that Shanghai Telecom user parses situation map；
Fig. 7 is that Beijing Telecom user parses situation map；
Fig. 8 is the system structure diagram of the CDN Optimization Scheduling the present invention is based on local dns；
Fig. 9 is the ICP content user experience optimization system logic of the CDN Optimization Scheduling the present invention is based on local dns
Flow chart；
Figure 10 is the ICP content user experience optimization system function of the CDN Optimization Scheduling the present invention is based on local dns
Figure.
Specific embodiment
Referring to the drawings and embodiment the present invention will be described in detail:
Attached drawing 1-10 it is found that a kind of CDN Optimization Scheduling based on local dns,
It include: ICP content user experience optimization system and internet content user experience optimization system；
Wherein ICP content user experience optimization system is the domain name often accessed for user, by ICP user experience
The authoritative domain name server of deployment ICP by optimization system, it is ICP that forwarding server is configured in ICP user experience optimization system
Authoritative domain name server address is directly forwarded by domain name and carries out resource acquisition, and no longer carries out recurrence；
Internet content user experience optimization system is other domain names except the ICP seldom accessed for user, is passed through
Safe plan global resources library obtain local testing as a result, in conjunction with user strategy, return to optimal the Resources list.
The workflow of the ICP content user experience optimization system is as follows:
ICP content user is disposed before local cache dns server and experiences optimization system, and ICP authoritative domain name is disposed on side
Server, wherein ICP content user experience optimization system is that logic is preposition, can also be deployed directly into local cache dns server
On.
ICP content user experience optimization system can the request domain name to user distinguish, the request of ICP domain name directly turns
Be dealt into side dispose ICP authoritative domain name server go solution new record, and will parsing conclusion return to ICP content user experience it is excellent
Change system, optimization system return to user, and user accesses optimal resource according to parsing result.The request of other domain names directly turns
It goes to parse to local cache dns server.
ICP content user experiences optimization system and supports ECS, and DNS request when can carry the source IP of user, and ICP is awarded
Weighing name server can guide user to nearest resource according to the source IP address of user.
For domain name: the domain name that user often accesses；
Deployment mode: logic is preposition, i.e., on local cache dns server or deployment safe plan ICP user experience in front end is excellent
Change system, and ICP authoritative domain name server is disposed nearby；
Scheduling mode: shunt, authorization nearby parsing, user directly in response to；
User's access: existing content node (provincial capital IDC), districts and cities' content node；
System reliability: forwarding switch, own services detection.
ICP content user experiences optimization system and ECS, DNS request packet is supported to carry the source IP address of user, ICP authorization clothes
Business device is configured with different solution new records to same domain name according to different source IP users, and ICP authorization server can basis
True client IP address returns to optimal solution new record, realizes accurately scheduling of resource, realizes the real nearest resource of user
Access, improve user access experience.
ICP authoritative domain name server is disposed in ICP content user experience optimization system, experiences and optimizes in ICP content user
The forwarding server address that common ICP domain name is configured in system is ICP authoritative domain name server address.
It realizes parsing nearby, saves away the time loss of recursion resolution, promote user experience, and only need ICP content
User experience optimization system support ECS can, overcome traditional ECS needs cache server, recursion server all
The problem of needing support ECS requires the network rebuilding low.
The present invention compared with the prior art the utility model has the advantages that
1. promoting user experience；
ICP authoritative domain name server is disposed nearby, is deployed directly into operator's local dns side, without recurrence of going out, just
Closely directly return to solution new record.
2. domain name shunts, local dns service ability is promoted；
ICP domain name and other domain names are divided into the domain name of request, the ICP domain name that most of frequentation is asked directly is passed through
ICP authoritative domain name server parses nearby, other domain names of remaining minority are parsed by local dns server, alleviates this
The parsing pressure of ground dns server, improves local dns server ability.
3. defect content source second grade switching；
It goes to parse since ICP content user experience optimization system directly passes through the ICP authoritative domain name server that side is disposed
And solution new record is not cached, when service server breaks down, ICP authoritative domain name server just will be deleted the failed server
Corresponding record, user would not return again to the address of failed server when parsing, but it is normal to return to service state
Service server address, realize defect content source second grade switching.
4. saving provider backbone bandwidth；
User demand responds nearby, on the one hand improves the access experience of user, improves the competitiveness of operator；It is another
Aspect dramatically saves the backbone bandwidth of operator's uplink, saves the cost of operator.
The above described is only a preferred embodiment of the present invention, not making in any form to structure of the invention
Limitation.Any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention,
Belong within the scope of technical solution of the present invention.
Claims (7)
1. a kind of CDN Optimization Scheduling based on local dns, which is characterized in that
It include: ICP content user experience optimization system and internet content user experience optimization system；
Wherein ICP content user experience optimization system is the domain name often accessed for user, by optimizing in ICP user experience
The authoritative domain name server of deployment ICP by system configures forwarding server in ICP user experience optimization system as ICP authorization
Domain name server address is directly forwarded by domain name and carries out resource acquisition, and no longer carries out recurrence；
Internet content user experience optimization system is other domain names except the ICP seldom accessed for user, passes through safe plan
Global resources library obtain local testing as a result, in conjunction with user strategy, return to optimal the Resources list.
2. the CDN Optimization Scheduling based on local dns according to claim 1, it is characterised in that:
The workflow of the ICP content user experience optimization system is as follows:
ICP content user is disposed before local cache dns server and experiences optimization system, and the service of ICP authoritative domain name is disposed on side
Device, wherein ICP content user experience optimization system is that logic is preposition, can also be deployed directly on local cache dns server.
3. the CDN Optimization Scheduling based on local dns according to claim 2, it is characterised in that:
ICP content user experience optimization system can the request domain name to user distinguish, the request of ICP domain name is forwarded directly to
The ICP authoritative domain name server of side deployment removes solution new record, and parsing conclusion is returned to ICP content user experience optimization system
System, optimization system return to user, and user accesses optimal resource according to parsing result.The request of other domain names passes directly to this
Ground caching DNS server goes to parse.
4. the CDN Optimization Scheduling based on local dns according to claim 3, it is characterised in that:
ICP content user experiences optimization system and supports ECS, and DNS request when can carry the source IP of user, ICP Authorized Domain
Name server can guide user to nearest resource according to the source IP address of user.
5. the CDN Optimization Scheduling based on local dns according to claim 4, it is characterised in that:
For domain name: the domain name that user often accesses；
Deployment mode: logic is preposition, i.e., on local cache dns server or safe plan ICP user experience optimization system is disposed in front end
System, and ICP authoritative domain name server is disposed nearby；
Scheduling mode: shunt, authorization nearby parsing, user directly in response to；
User's access: existing content node (provincial capital IDC), districts and cities' content node；
System reliability: forwarding switch, own services detection.
6. the CDN Optimization Scheduling based on local dns according to claim 5, it is characterised in that:
ICP content user experiences optimization system and ECS, DNS request packet is supported to carry the source IP address of user, ICP authorization server
Different solution new records is configured with to same domain name according to different source IP users, ICP authorization server can be according to true
Client IP address return to optimal solution new record, realize accurately scheduling of resource, realize the visit of the real nearest resource of user
It asks, improves user and access experience.
7. the CDN Optimization Scheduling based on local dns according to claim 6, it is characterised in that:
ICP authoritative domain name server is disposed in ICP content user experience optimization system, experiences optimization system in ICP content user
The forwarding server address of the upper common ICP domain name of configuration is ICP authoritative domain name server address.
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| CN111327714A (en) * | 2018-12-17 | 2020-06-23 | 中国电信股份有限公司 | Domain name recursive query method and system, server and DNS system |
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| CN113885794A (en) * | 2021-09-10 | 2022-01-04 | 鸬鹚科技(深圳)有限公司 | Data access method and device based on multi-cloud storage, computer equipment and medium |
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| CN111917898B (en) * | 2020-07-24 | 2021-08-27 | 网宿科技股份有限公司 | Resource scheduling policy adjusting method and device |
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| CN114500456B (en) * | 2020-10-23 | 2024-01-12 | 中国移动通信集团河北有限公司 | DNS (Domain name System) scheduling optimization method and device based on whole network sniffing and computing equipment |
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