CN106790340A - A kind of link scheduling method and device - Google Patents
A kind of link scheduling method and device Download PDFInfo
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- CN106790340A CN106790340A CN201610266086.1A CN201610266086A CN106790340A CN 106790340 A CN106790340 A CN 106790340A CN 201610266086 A CN201610266086 A CN 201610266086A CN 106790340 A CN106790340 A CN 106790340A
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- dns
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- resource pool
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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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
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5061—Pools of addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
Abstract
The embodiment of the invention discloses a kind of link scheduling method and device, the method includes：The domain name system DNS proxy server is after carrying domain-name information the first DNS request message is received, it is first determined from the corresponding resource pool of the domain-name information that load balancing LB device requests are obtained, the resource pool includes at least one link information；From the resource pool at least one included link information, determine Target Link information, and the DNS response messages of Target Link IP address that will be carried corresponding to the Target Link information are sent to client, using the embodiment of the present invention realizing the load balancing of the link in the case where client uses domain name system DNS to act on behalf of.
Description
Technical field
The present invention relates to technical field of information communication, more particularly to a kind of link scheduling method and device.
Background technology
In the link load sharing typical case's application based on DNS (Domain Name System, domain name system)
In networking, client accesses intranet server (i.e. as the external interconnections network users for accessing intranet server
The server of data service is provided) when, its existing workflow is：Client takes to local dns first
DNS request message is initiated in business device (as dns-proxy server), wherein, in the DNS request message
Comprising domain-name information；Another DNS that local dns server will be generated according to the DNS request message again please
Message is asked to be sent to LB device (Load Balancing Device, balancing link load equipment, hereafter letter
Claim LB equipment)；The LB device select optimum link according to the dispatching algorithm for pre-setting from multilink,
And the corresponding link IP address of the optimum link is sent to the local dns service by DNS response messages
Device；After the link IP address that the local dns server will be received, cache the link IP address and be somebody's turn to do
The corresponding relation of domain-name information, and the link IP address is sent to client, client obtains the local dns
The link IP address that server sends, and follow-up access intranet server is performed according to the link IP address
Action, wherein, for the DNS request message and another DNS request message, its is each self-corresponding
Source address is different from destination address, and the specific data message that it is each carried is identical.
For existing workflow, when local dns server caches link IP address and domain-name information
Corresponding relation after, receive again client transmission the DNS request message on the domain-name information after,
Can directly to the client send the DNS response messages on corresponding link IP address, will not again to
LB device make requests on.It can be seen that, existing workflow causes to send all on same domain-name information
Client, the access of intranet server is all carried out by same link IP address, all of flow all exists
It is transmitted on one link, causes the link load excessive.
The content of the invention
The embodiment of the invention discloses a kind of link scheduling method and device, to realize using domain name in client
The load balancing of the link in the case of system DNS proxy.Concrete scheme is as follows：
On the one hand, a kind of link scheduling method is the embodiment of the invention provides, domain name system DNS generation is applied to
Reason server, methods described includes：
The first DNS request message that client sends is received, the first DNS request message carries domain name letter
Breath；
It is determined that the corresponding resource pool of domain name information obtained from load balancing LB device requests, wherein, institute
Stating resource pool includes at least one link information, and each link information includes corresponding with domain name information
Link IP address, the link information has unique correspondence with link IP address；
In at least one link information included from the resource pool, Target Link information is determined；
Sent to the client and carry the first of the Target Link IP address that the Target Link information includes
DNS response messages.
On the one hand, the embodiment of the present invention additionally provides a kind of link scheduling method, is applied to load balancing LB and sets
Standby, methods described includes：
The second DNS request message that dns-proxy server sends is received, in the second DNS request message
Domain-name information is carried, domain name information is the DNS that client sends to the dns-proxy server
The domain-name information that request message is carried；
According to domain name information resource pool of the generation comprising at least one link information, wherein, each link
Information includes the corresponding link IP address of domain name information, and the link information has unique with link IP address
Correspondence；
Generation and the 2nd DNS response messages corresponding to the second DNS request message, wherein, described the
The resource pool is carried in two DNS response messages；
The 2nd DNS response messages, the 2nd DNS response reports are sent to the dns-proxy server
Text carries the resource pool, so that：The dns-proxy server determines Target Link from the resource pool
Information, and send the first of the Target Link IP address that the carrying Target Link information includes to the client
DNS response messages.
On the one hand, the embodiment of the present invention additionally provides a kind of link scheduling device, is applied to domain name system DNS
Proxy server, described device includes：First request message receiver module, resource pool determining module, first
Target information determining module and the first response message sending module；
The first request message receiver module：The first DNS request message for receiving client transmission,
The first DNS request message carries domain-name information；
The resource pool determining module：For the domain name letter for determining to be obtained from load balancing LB device requests
Corresponding resource pool is ceased, wherein, the resource pool includes at least one link information, each link information
Including link IP address corresponding with domain name information, it is unique right that the link information has with link IP address
Ying Xing；
The first object information determination module：For at least one chain included from the resource pool
In the information of road, Target Link information is determined；
The first response message sending module：The Target Link letter is carried for being sent to the client
First DNS response messages of the Target Link IP address that breath includes.
On the other hand, the embodiment of the present invention additionally provides a kind of link scheduling device, is applied to load balancing LB
Equipment, described device includes：Second request message receiver module, resource pool generation module, the second response report
Literary generation module and the second response message sending module；
The second request message receiver module：The 2nd DNS for receiving dns-proxy server transmission please
Message is sought, domain-name information is carried in the second DNS request message, domain name information is client to institute
State the domain-name information that the first DNS request message of dns-proxy server transmission is carried；
The resource pool generation module：For including at least one link information according to the generation of domain name information
Resource pool, wherein, each link information include the corresponding link IP address of domain name information, the link
Information has unique correspondence with link IP address；
The second response message generation module：For generate with corresponding to the second DNS request message
2nd DNS response messages, wherein, carry the resource pool in the 2nd DNS response messages；
The second response message sending module：For sending described second to the dns-proxy server
DNS response messages, the 2nd DNS response messages carry the resource pool, so that：The DNS proxy
Server determines Target Link information from the resource pool, and sends the carrying target to the client
First DNS response messages of the Target Link IP address that link information includes.
In this programme, unlike the prior art, the dns-proxy server is receiving carrying domain name
After information the first DNS request message, it is first determined from the domain-name information that load balancing LB device requests are obtained
Corresponding resource pool, the resource pool includes at least one link information, from the resource pool it is included to
In a few link information, it is determined that Target Link information, and will carry corresponding to the Target Link information
First DNS response messages of Target Link IP address are sent to client, to realize using domain name system in client
The load balancing of the link in the case of system DNS proxy.Certainly, any product of the invention or side are implemented
Method must be not necessarily required to while reaching all the above advantage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to implementing
Example or the accompanying drawing to be used needed for description of the prior art are briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of schematic flow sheet of link scheduling method that Fig. 1 is provided by the embodiment of the present invention；
A kind of another schematic flow sheet of link scheduling method that Fig. 2 is provided by the embodiment of the present invention；
A kind of structural representation of link scheduling device that Fig. 3 is provided by the embodiment of the present invention；
A kind of another structural representation of link scheduling device that Fig. 4 is provided by the embodiment of the present invention；
The networking diagram on domain name system DNS that Fig. 5 is provided by the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that is obtained, belong to the scope of protection of the invention.
A kind of link scheduling method and device is the embodiment of the invention provides, to realize using domain name in client
The load balancing of the link in the case of system DNS proxy.
A kind of link scheduling method for being provided the embodiment of the present invention first below is introduced.
It should be noted that a kind of link scheduling method that the embodiment of the present invention is provided, can apply to domain
Name system dns-proxy server.Wherein, the dns-proxy server is communicated with load balancing LB equipment,
In the dns-proxy server have certain memory space, for storage receive comprising at least one
The resource pool of link information, also, at least one link information included in resource pool is selected.
The memory space can be the memory space of the local memory space for carrying, or dilatation.
In addition, it is necessary to, it is emphasized that follow-up mentioned " the first DNS request message " for arriving of the embodiment of the present invention
In " first " and " the second DNS request message " in " second " be used only for from name distinguish
The DNS request message that dns-proxy server is received with LB equipment, and without any limiting meaning.
The first DNS request message and the second DNS request message, its each corresponding source address and purpose
Address is different, and the data message entrained by it is identical.
A kind of link scheduling method is the embodiment of the invention provides, as shown in figure 1, may include steps of：
S101：The first DNS request message that client sends is received, the first DNS request message carries domain
Name information；
It is understood that when client has the demand for accessing intranet server, the client can be to this
Dns-proxy server sends the first DNS request message, now, the dns-proxy server receive this
One DNS request message, domain-name information is carried in the first DNS request message.Wherein, reception client
Holding the first DNS request message for sending can use prior art, will not be described here.For example, should
When the domain-name information of intranet server is www.test.com, the domain name that the first DNS request message is carried
Information can be www.test.com.
S102：It is determined that the corresponding resource pool of the domain-name information obtained from load balancing LB device requests, wherein,
The resource pool includes at least one link information, and each link information includes chain corresponding with the domain-name information
Road IP address, the link information has unique correspondence with link IP address；
Wherein, after the dns-proxy server receives the first DNS request message for carrying domain-name information,
In order to ask the corresponding link IP address of domain-name information to client feedback, it may be determined that please from LB equipment
The corresponding resource pool of the domain-name information for obtaining is sought, and then follow-up treatment is performed based on the resource pool.Can be with
Understand, the resource pool this can ask the resulting corresponding resource pool of the domain-name information (i.e. with right and wrong
It has been stored in local resource pool), or the resulting corresponding resource of the domain-name information of this request
Pond.In addition, client can have access to the domain name according to included each link information in the resource pool
The corresponding intranet server of information, then carries out the carrying out of data service.Wherein, the determination of the resource pool can
To use prior art, will not be described here.
In the present embodiment, the LB equipment is based on the domain name it is confirmed that at least one preferably link information, its
In, the preferably link information of determination at least one can use existing any one link selection mechanism, institute
Corresponding selection mechanism can be bandwidth busy extent mechanism, can be by each link information according to current ink
Busy extent is ranked up from low to high, and several the forward busy extents that sort chosen in the sequence are low
Link information, constitutes resource pool；Or quantified busy extent using prior art, choose busy
Degree is combined into resource pool less than the link information of a certain threshold value.
S103：In at least one link information included from the resource pool, Target Link information is determined；
It is understood that when the dns-proxy server determines the domain obtained from the LB device requests
During the name corresponding resource pool of information, the dns-proxy server can according to the link scheduling algorithm for pre-setting,
From at least one link information included in resource pool, Target Link information is determined, wherein this is advance
The link scheduling algorithm of setting can be the selection of poll selection algorithm, stochastic selection algorithm or Smallest connection number
Algorithm, wherein, the link scheduling algorithm that this pre-sets can be adjusted according to actual conditions.
For example, at least one link information for being included in the resource pool respectively link information 1, link letter
Breath 2 and link information 3, comprising unique corresponding link IP address in each link information, respectively：
Link information 1- link IP address 1, link information 2- link IP address 2 and link information 3- links IP
Address 3.When the link scheduling algorithm that this pre-sets is poll selection algorithm, the link information 1, link
Information 2 and link information 3 can be that circulation is targeted link information, carry out follow-up flow；
The link scheduling algorithm pre-set when this is stochastic selection algorithm, then can be random from the link information 1,
A link information is selected in link information 2 and link information 3, is defined as Target Link information；When this
The link scheduling algorithm for pre-setting be Smallest connection number selection algorithm when, then can select the link information 1,
Corresponding link IP address 1, link IP address 2 and chain are distinguished in link information 2 and link information 3
The link information of the connection number minimum in road IP address 3, mesh is defined as by the minimum link information of the connection number
Mark link information.
S104：Sent to the client and carry the of Target Link IP address corresponding to the Target Link information
One DNS response messages.
It should be noted that after the dns-proxy server determines Target Link information, can be to the client
The DNS response messages for carrying the Target Link IP address corresponding to the Target Link information are sent, so that
The client parses the Target Link IP address, according to this after a DNS response messages are received
Target Link IP address, accesses the corresponding intranet server of the domain-name information.Wherein, the transmission carries the mesh
First DNS response messages of the Target Link IP address corresponding to mark link information can use prior art,
Will not be described here.
Using the embodiment of the present invention, the dns-proxy server is receiving carrying domain-name information the DNS
After request message, it is first determined from the corresponding resource of the domain-name information that load balancing LB device requests are obtained
Pond, the resource pool includes at least one link information, at least one included link from the resource pool
In information, it is determined that Target Link information, and will carry the Target Link information corresponding to Target Link IP
First DNS response messages of address are sent to client, realize using domain name system DNS generation in client
The load balancing of the link in the case of reason.
Further, it is necessary to explanation, believes for the carrying domain name that dns-proxy server is received
First DNS request message of breath, it is probably that the dns-proxy server is received on the domain for the first time
First DNS request message of name information, it is also possible to which the dns-proxy server non-first time receives pass
In the first DNS request message of the domain-name information.When for first time, the dns-proxy server is local
Will not be stored with the resource pool on the domain-name information to be visited obtained from the LB device requests.When being non-
An at time, the dns-proxy server may locally be stored with from the LB device requests obtain on this
The resource pool of domain-name information, it is also possible to which be not stored with the resource pool on the domain-name information.Therefore, in order to protect
Demonstrate,prove for the first DNS request message response, when be not stored with locally from the LB device requests obtain should
During the corresponding resource pool of domain-name information, now, a kind of link scheduling method that the embodiment of the present invention is provided is also
Can include：
The second DNS request message is sent to the LB equipment, the second DNS request message carries the domain-name information,
So that the LB equipment generates the corresponding resource pool of the domain-name information；
Receive the 2nd DNS response messages of the carrying of the LB equipment transmission resource pool.
It is understood that it is determined that the domain-name information obtained from load balancing LB device requests is corresponding
During resource pool, determine that the local of the dns-proxy server does not store the corresponding resource pool of the domain-name information
When, the dns-proxy server is needed to the corresponding resource pool of the LB device requests domain-name informations, i.e., to
The LB equipment sends the second DNS request message for carrying the domain-name information, receives LB equipment transmission
The corresponding resource pool of the domain-name information is carried, and after the resource pool is received, is included from the resource pool
At least one link information in, determine Target Link information, and sent to the client and carry the target
First DNS response messages of the Target Link IP address corresponding to link information.The generation the 2nd DNS please
Message is asked to be will not be described here using prior art.Wherein, after the resource pool is received, the DNS
Proxy server can store the corresponding relation of the domain-name information and resource pool.
In a kind of specific implementation, in order that the LB equipment can be told whether needing to DNS
Proxy server sends the corresponding resource pool of the domain-name information, can also be taken in the second DNS request message
Band scheduled field；
The LB equipment when judging that the scheduled field is effective, can according to the second DNS request message,
The corresponding resource pool of the domain-name information is generated, and the resource pool is sent to dns-proxy server.Work as judgement
Go out scheduled field it is invalid when, the LB equipment can to the dns-proxy server send DNS error messages,
After the dns-proxy server receives the DNS error messages, second can be sent to the LB equipment again
DNS request message is transferred to the flow of prior art；Or, the LB equipment can make a reservation for the carrying
Field the second DNS request message is mourned in silence discarding, and now, the dns-proxy server is within a certain period of time not
Receive the LB equipment transmission for the second DNS request message generation the 2nd DNS response messages or
During DNS error messages, it is also possible to send the second DNS request message to the LB equipment again or be transferred to existing
There is the flow of technology；Certainly preferably it is that the number of times of the second DNS request message is being sent to the LB equipment
After more than pre-determined number, then the flow for being transferred to prior art.
It is emphasized that the preset field can in advance consult for the dns-proxy server with LB equipment
The unspecified and legal field of good current domain name system DNS agreement.In a kind of specific implementation,
The scheduled field can be the type type fields of the second DNS request message.For example, Intranet clothes
The corresponding domain-name information of business device is www.test.com, the then domain-name information that the second DNS request message is carried
It is www.test.com, the type fields (scheduled field) of carrying can be resource pool (0x0099).
Further, after the storage time of the resource pool that the dns-proxy server is locally stored is more long, should
Link IP address in resource pool corresponding at least one included link information is just not necessarily current time
Corresponding preferably link IP address, for example：Corresponding to the intranet server that the domain-name information is directed to
And it is present in the corresponding connection number of the link IP address in resource pool excessively, and the Intranet clothes that the domain-name information is directed to
It is engaged in corresponding to device and is not present in the link IP address in resource pool in idle condition, it is clear that does not exist now
Be wasted in the link IP address in resource pool, and exist with resource pool in link IP address overload, this
Sample, the link IP address in the resource pool corresponding at least one included link information is just not necessarily currently
Time corresponding preferably link IP address.In order to preferably realize the load balancing of link IP address, improve
The utilization rate of link IP address, in one implementation, can also include on the resource in the resource pool
The ageing time in pond；
A kind of link scheduling method that the embodiment of the present invention is provided can also include：
When the storage time that the resource pool is stored in the dns-proxy server exceedes the ageing time, abandon
The resource pool.
It is understood that after resource pool is dropped, when dns-proxy server is received on being dropped
Resource pool corresponding to domain-name information the first DNS request after, it is necessary to be provided to LB device requests again
Source pond, or, when the resource pool is dropped, the dns-proxy server sends to the LB equipment and takes again
The second DNS request message with the domain-name information, to the corresponding money of the LB equipment re-request domain-name information
Source pond.Wherein, the occurrence of ageing time can be set according to actual conditions, not limited herein.
Further, at least one link information included in the resource pool, each link
Can all there is limiting value in the portative connection number of link IP address institute corresponding to information, and for different chains
Also can be present difference in road IP address, the limiting value, in order to preferably utilize the link IP address in the system, carry
The utilization rate of link IP address high, the link information also include it is corresponding with link IP address can quantity allotted；
A kind of link scheduling method that the embodiment of the present invention is provided can also include：
First of the Target Link IP address corresponding to the Target Link information is being carried to client transmission
After DNS response messages, by corresponding to the Target Link IP address this can quantity allotted subtract one, until correspondence
Can quantity allotted be 0 when, the Target Link IP address be no longer used to distribution；Also,
When at least one link information include it is corresponding with link IP address can quantity allotted all be 0 when,
Abandon the resource pool.
Further, the first DNS request of the carrying domain-name information is received in the dns-proxy server
After message, the domain-name information can be locally stored.The place of the dns-proxy server in order to better improve
A kind of rationality energy, link scheduling method that the embodiment of the present invention is provided can also include：
When the resource pool is abandoned, the second DNS request message, second DNS request are sent to the LB equipment
Message carries the domain-name information, so that the LB equipment regenerates the corresponding resource pool of the domain-name information；
Receive the 2nd DNS of the corresponding resource pool of the domain-name information that the carrying of LB equipment transmission is regenerated
Response message.
It is understood that when the resource pool having requested that is dropped, directly can be sent out to the LB equipment
The the second DNS request message for carrying the domain-name information is sent, to avoid receiving the first DNS request again
During message, then to LB device requests, increase the processing load of dns-proxy server, meanwhile, Ke Yiti
Treatment effeciency for the first DNS request message high.Wherein it is possible to periodically be sent to the LB equipment
The second DNS request message of the domain-name information is carried, until the corresponding resource pool of the domain-name information is arrived in request.
Specifically, when the dns-proxy server receives the first of the carrying domain-name information of client transmission
After DNS request message, it is determined that the corresponding resource pool of the domain-name information obtained from LB device requests, from this
In at least one link information included in resource pool, Target Link information is determined, and Target Link will be carried
First DNS response messages of the Target Link IP address that information includes are sent to client；Also, work as and reach
When abandoning the drop mechanism of the resource pool, the resource pool is abandoned.When the resource pool is abandoned, the DNS proxy
Server can directly send the second DNS request message for carrying the domain-name information to the LB equipment, to this
The corresponding resource pool of the LB equipment re-request domain-name information, or carry the domain-name information receiving again
The first DNS request message after, to the corresponding resource pool of the LB equipment re-request domain-name information.Its
In, the drop mechanism exceedes ageing time including the storage time that resource pool is stored in dns-proxy server,
And at least one of resource pool link information include it is corresponding with link IP address can quantity allotted
All it is 0.
Corresponding to above method embodiment, the embodiment of the present invention additionally provides a kind of link scheduling method, can be with
Load balancing LB equipment is applied to, the LB equipment is communicated with dns-proxy server, as shown in Fig. 2
Step can be included：
S201：Receive the second DNS request message that dns-proxy server sends, the second DNS request report
Domain-name information is carried in text, the domain-name information is the DNS that client sends to the dns-proxy server
The domain-name information that request message is carried；
It should be noted that in a kind of specific implementation, when the dns-proxy server is determined locally
Be not stored with resource pool corresponding from the domain-name information that the LB device requests are obtained when, DNS proxy clothes
Business device sends the second DNS request message for carrying the domain-name information to the LB equipment, and the LB equipment can be with
The second DNS request message of dns-proxy server transmission is received using prior art, and according to this
The domain-name information of carrying carries out follow-up flow.
S202：According to domain-name information resource pool of the generation comprising at least one link information, wherein, it is each
Link information includes the corresponding link IP address of the domain-name information, and the link information has unique with link IP address
Correspondence；
It is understood that the LB equipment is from after receiving the second DNS request message, according to the domain name
Information, resource pool of the generation comprising at least one link information.Unlike the prior art, prior art
It is to choose current optimal link information, what is chosen in embodiments of the present invention is current preferably at least one
Link information.
S203：Generation and the 2nd DNS response messages corresponding to the second DNS request message, wherein, should
The resource pool is carried in 2nd DNS response messages；
Wherein, the DNS response messages of generation the 2nd can use prior art, will not be described here.Can be with
Understand, the LB equipment can simultaneously process multichannel the second DNS request message, the 2nd DNS of the generation
Response message has correspondence with the second received DNS request message, and the LB equipment passes through this pair
Ying Xing, corresponding dns-proxy server is sent to by the 2nd DNS response messages of the generation.Citing and
Speech, the correspondence can be by the response message and the source IP addresses and target ip address of request message
It is determined that,
S204：The 2nd DNS response messages, the 2nd DNS responses are sent to the dns-proxy server
Message carries the resource pool, so that：The dns-proxy server determines Target Link information from the resource pool,
And the DNS responses for carrying the Target Link IP address that the Target Link information includes are sent to the client
Message.
It should be noted that sending to the dns-proxy server and can adopting the 2nd DNS response messages
With prior art, will not be described here.
Using the embodiment of the present invention, the LB equipment is receiving the carrying domain name of dns-proxy server transmission
After second DNS request message of information, according to domain-name information money of the generation comprising at least one link information
Source pond, and the resource pool is sent to the dns-proxy server, so that：The dns-proxy server exists
After receiving any first DNS request message for carrying the domain-name information, what is included from the resource pool should be to
In a few link information, Target Link information is determined；Sent to the client and carry the Target Link information
First DNS response messages of corresponding Target Link IP address.To realize using domain name system in client
The load balancing of the link in the case of DNS proxy.
Further, in a kind of specific implementation, in order that the LB equipment can tell whether
Need to send the corresponding resource pool of the domain-name information to dns-proxy server, the second DNS request message
In can also carry scheduled field；
A kind of link scheduling method that the embodiment of the present invention is provided, can also include：
Judge whether the scheduled field is effective；When judging effective, S202 is performed.
It is understood that when the LB equipment judges the preset field for effective, the second DNS request report
It is the request for asking the corresponding resource pool of the domain-name information that text can be determined that, the LB equipment then can basis
Domain-name information resource pool of the generation comprising at least one link information, to feed back to the dns-proxy server.
In a kind of specific implementation, when the LB equipment judges that the scheduled field is invalid, the LB equipment can be with root
According to existing DNS Protocol, DNS mistakes are returned to dns-proxy server for the second DNS request message
Message, wherein, different error codes can be carried in the DNS error messages, so that the DNS proxy is serviced
It is that the second DNS request message occurs in that mistake that device can be recognized according to the error code, or is the LB equipment
The scheme for not supporting the embodiment of the present invention to be provided, and then make the dns-proxy server decision-making be to resend
Second DNS request message is still transferred to the flow of prior art to ask resource pool.It should be noted that working as
When the LB equipment judges that the scheduled field is invalid, the LB equipment may mourn in silence the second DNS request message
Abandon, be directed to the dns-proxy server, being directed to for LB equipment return is not received within a certain period of time
Carry the 2nd DNS response messages or DNS error messages of the second DNS request message of the domain-name information
When, the second DNS request message can be resend to ask resource pool, or, can directly be transferred to existing
The flow of technology.
Further, after the storage time of the resource pool that the dns-proxy server is locally stored is more long, should
Link IP address in resource pool corresponding at least one included link information is just not necessarily current time
Corresponding preferably link IP address, for example：Corresponding to the intranet server that the domain-name information is directed to
And it is present in the corresponding connection number of the link IP address in resource pool excessively, and the Intranet clothes that the domain-name information is directed to
It is engaged in corresponding to device and is not present in the link IP address in resource pool in idle condition, it is clear that does not exist now
Be wasted in the link IP address in resource pool, and exist with resource pool in link IP address overload, this
Sample, the link IP address in the resource pool corresponding at least one included link information is just not necessarily currently
Time corresponding preferably link IP address.In order to preferably realize the load balancing of link IP address, improve
The utilization rate of link IP address, in one implementation, can also include on the resource in the resource pool
The ageing time in pond；
The dns-proxy server is somebody's turn to do when the storage time that the resource pool is stored in the dns-proxy server exceedes
During ageing time, the resource pool is abandoned.
It is understood that after resource pool is dropped, when dns-proxy server is received on being dropped
Resource pool corresponding to domain-name information the first DNS request after, it is necessary to be provided to LB device requests again
Source pond, or, when the resource pool is dropped, the dns-proxy server sends to the LB equipment and takes again
The second DNS request message with the domain-name information, to the corresponding money of the LB equipment re-request domain-name information
Source pond.Wherein, the occurrence of ageing time can be set according to actual conditions, not limited herein.
Further, at least one link information included in the resource pool, each link
Can all there is limiting value in the portative connection number of link IP address institute corresponding to information, and for different chains
Also can be present difference in road IP address, the limiting value, in order to preferably utilize the link IP address in the system, carry
The utilization rate of link IP address high, the link information also include it is corresponding with link IP address can quantity allotted,
So that the dns-proxy server is carrying the Target Link that the Target Link information includes to client transmission
After first DNS response messages of IP address, by the Target Link IP address it is corresponding can quantity allotted subtract one,
Until it is corresponding can quantity allotted be 0 when, the Target Link IP address be no longer used to distribution；Also,
The dns-proxy server is corresponding with link IP address when judging that at least one link information includes
Can quantity allotted all be 0 when, abandon the resource pool.
The scheme that the embodiment of the present invention is provided is introduced in order to clearer, with reference to Fig. 5, by specifically should
The link scheduling method provided the embodiment of the present invention with example is introduced.
Fig. 5 show the networking diagram on domain name system DNS, wherein, Local DNS are implemented for the present invention
The dns-proxy server that example is previously mentioned；The client that Client host are previously mentioned for the embodiment of the present invention；
Cluster represents a network group, and respectively including Virtual network operator ISP-1, ISP-2, ISP-3, three lead to
The link of intranet server Intermal server, respectively Link1, Link2, Link3 (correspond to chain respectively
Road IP address：1.0.0.1,2.0.0.1 and 3.0.0.1)；The LB that LB device are previously mentioned for the embodiment of the present invention
Equipment；The intranet server that Internal server are previously mentioned for the embodiment of the present invention, the domain of the intranet server
Name information is www.test.com.
In one implementation, workflow can be：Client host send to Local DNS and carry domain
The first DNS request message of name information www.test.com, the Local DNS are determined from load balancing LB
The corresponding money for including at least one link information of domain-name information " www.test.com " that device request is obtained
Source pond, selects a link information from resource pool, by the link IP address (the corresponding to the link information
One DNS response messages) it is sent to Client host.It is not stored with from the LB device requests locally when determining
The corresponding resource pool for including at least one link information of domain-name information " www.test.com " for obtaining, to
LB device send the second DNS request message for carrying domain-name information " www.test.com ", the LB device
According to the domain-name information " www.test.com " carried in the second DNS request message, it is determined that comprising at least one
The resource pool of link information, and the resource pool (the 2nd DNS response messages) is sent to Local DNS.
It can be seen that, by the workflow, it is possible to achieve Client host are in the case of using Local DNS proxies
Realize the load balancing of link.
Corresponding to above method embodiment, the embodiment of the present invention additionally provides a kind of link scheduling device, such as Fig. 3
It is shown, domain name system DNS proxy server is can apply to, described device can include：First request report
Literary receiver module 301, resource pool determining module 302, the response report of first object information determination module 303 and first
Literary sending module 304；
The first request message receiver module 301：The first DNS request report for receiving client transmission
Text, the first DNS request message carries domain-name information；
The resource pool determining module 302：For the domain name for determining to be obtained from load balancing LB device requests
The corresponding resource pool of information, wherein, the resource pool includes at least one link information, each link letter
Breath includes link IP address corresponding with domain name information, and the link information has unique with link IP address
Correspondence；
The first object information determination module 303：For included from the resource pool described at least one
In link information, Target Link information is determined；
The first response message sending module 304：The Target Link is carried for being sent to the client
First DNS response messages of the Target Link IP address that information includes.
Using the embodiment of the present invention, the dns-proxy server is receiving carrying domain-name information the DNS
After request message, it is first determined from the corresponding resource of the domain-name information that load balancing LB device requests are obtained
Pond, the resource pool includes at least one link information, at least one included link from the resource pool
In information, it is determined that Target Link information, and will carry the Target Link information corresponding to Target Link IP
First DNS response messages of address are sent to client, to realize using domain name system DNS in client
The load balancing of the link in the case of agency.
Specifically, a kind of link scheduling device that the embodiment of the present invention is provided can also include the second request report
Literary sending module and the second response message receiver module；
The second request message sending module：Obtained from the LB device requests for that ought be stored with locally
Domain name information corresponding resource pool when, send the second DNS request message to the LB equipment, it is described
Second DNS request message carries domain name information, so that LB equipment generation domain name information correspondence
Resource pool；
The second response message receiver module：For receiving the carrying resource pool that the LB equipment sends
The 2nd DNS response messages.
Specifically, also carrying scheduled field in the second DNS request message；
The LB equipment performs the generation domain name information pair when judging that the scheduled field is effective
The step of resource pool answered.
Specifically, also including the ageing time on the resource pool in the resource pool；
A kind of link scheduling device that the embodiment of the present invention is provided can also include the first discard module；
First discard module：Storage for being stored in the dns-proxy server when the resource pool
When time exceedes the ageing time, the resource pool is abandoned.
Specifically, the link information also include it is corresponding with link IP address can quantity allotted；
A kind of link scheduling device that the embodiment of the present invention is provided can also include can the quantity allotted module that subtracts
With the second discard module；
It is described can the quantity allotted module that subtracts：For sending the carrying Target Link letter to the client
After first DNS response messages of the Target Link IP address that breath includes, by the Target Link IP address
It is corresponding can quantity allotted subtract one, until it is corresponding can quantity allotted be 0 when, the Target Link IP address is not
It is used further to distribution；
Second discard module：For include when at least one link information and link IP address
It is corresponding can quantity allotted when being all 0, abandon the resource pool.
A kind of link scheduling device that the embodiment of the present invention is provided can also include that the 3rd request message sends mould
Block and the 3rd response message receiver module；
The 3rd request message sending module：For when the resource pool is abandoned, being sent out to the LB equipment
The second DNS request message is sent, the second DNS request message carries domain name information, so that the LB
Equipment regenerates the corresponding resource pool of domain name information；
The 3rd response message receiver module：For receiving what the carrying that the LB equipment sends was regenerated
2nd DNS response messages of the corresponding resource pool of domain name information.
Corresponding to above method embodiment, the embodiment of the present invention additionally provides a kind of link scheduling device, can be with
Load balancing LB equipment is applied to, as shown in figure 4, described device can include：Second request message receives mould
Block 401, resource pool generation module 402, the second response message generation module 403 and the second response message send mould
Block 404；
The second request message receiver module 401：The 2nd DNS for receiving dns-proxy server transmission
Request message, carries domain-name information in the second DNS request message, domain name information be client to
The domain-name information that the first DNS request message that the dns-proxy server sends is carried；
The resource pool generation module 402：For including at least one link letter according to the generation of domain name information
The resource pool of breath, wherein, each link information includes the corresponding link IP address of domain name information, the chain
Road information has unique correspondence with link IP address；
The second response message generation module 403：For generate with corresponding to the second DNS request message
The 2nd DNS response messages, wherein, carry the resource pool in the 2nd DNS response messages；
The second response message sending module 404：For sending described the to the dns-proxy server
Two DNS response messages, the 2nd DNS response messages carry the resource pool, so that：The DNS
Proxy server determines Target Link information from the resource pool, and it is described to send carrying to the client
First DNS response messages of the Target Link IP address that Target Link information includes.
Using the embodiment of the present invention, the LB equipment is receiving the carrying domain name of dns-proxy server transmission
After second DNS request message of information, according to domain-name information money of the generation comprising at least one link information
Source pond, and the resource pool is sent to the dns-proxy server, so that：The dns-proxy server exists
After receiving any first DNS request message for carrying the domain-name information, what is included from the resource pool should be to
In a few link information, Target Link information is determined；Sent to the client and carry the Target Link information
First DNS response messages of corresponding Target Link IP address.To realize using domain name system in client
The load balancing of the link in the case of DNS proxy.
Specifically, scheduled field can also be carried in the second DNS request message：
A kind of link scheduling device that the embodiment of the present invention is provided can also include field judge module；
The field judge module：For judging whether the scheduled field is effective；When judging effective, touch
Send out resource pool generation module 402 described.
Specifically, the ageing time on the resource pool can also be included in the resource pool；
The dns-proxy server ought judge that the resource pool is stored in depositing for the dns-proxy server
When the storage time exceedes the ageing time, the resource pool is abandoned.
Specifically, the link information also include it is corresponding with link IP address can quantity allotted so that described
Dns-proxy server is sending the Target Link IP that the carrying Target Link information includes to the client
After first DNS response messages of address, by the Target Link IP address it is corresponding can quantity allotted subtract one,
Until it is corresponding can quantity allotted be 0 when, the Target Link IP address be no longer used to distribution；Also,
The dns-proxy server ought judge at least one link information includes and link IP address
It is corresponding can quantity allotted when being all 0, abandon the resource pool.
For systems/devices embodiment, because it is substantially similar to embodiment of the method, so the ratio of description
Relatively simple, the relevent part can refer to the partial explaination of embodiments of method.
It should be noted that herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these
There is any this actual relation or order between entity or operation.And, term " including ", "comprising"
Or any other variant thereof is intended to cover non-exclusive inclusion, so that a series of mistake including key elements
Journey, method, article or equipment not only include those key elements, but also other including being not expressly set out
Key element, or it is this process, method, article or the intrinsic key element of equipment also to include.Do not having
In the case of more limitations, the key element limited by sentence "including a ...", it is not excluded that wanted including described
Also there is other identical element in process, method, article or the equipment of element.
One of ordinary skill in the art will appreciate that realizing all or part of step in above method implementation method
Program be can be by instruct the hardware of correlation to complete, described program can be stored in computer-readable
In taking storage medium, storage medium designated herein, such as：ROM/RAM, magnetic disc, CD etc..
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.
All any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in
In protection scope of the present invention.
Claims (14)
1. a kind of link scheduling method, it is characterised in that be applied to domain name system DNS proxy server, institute
The method of stating includes：
The first DNS request message that client sends is received, the first DNS request message carries domain name letter
Breath；
It is determined that the corresponding resource pool of domain name information obtained from load balancing LB device requests, wherein, institute
Stating resource pool includes at least one link information, and each link information includes corresponding with domain name information
Link IP address, the link information has unique correspondence with link IP address；
In at least one link information included from the resource pool, Target Link information is determined；
Sent to the client and carry the first of the Target Link IP address that the Target Link information includes
DNS response messages.
2. method according to claim 1, it is characterised in that set from the LB when not being stored with locally
During the corresponding resource pool of domain name information that standby request is obtained, methods described also includes：
The second DNS request message is sent to the LB equipment, the second DNS request message carries the domain
Name information, so that the corresponding resource pool of LB equipment generation domain name information；
Receive the 2nd DNS response messages of the carrying resource pool that the LB equipment sends.
3. method according to claim 1 and 2, it is characterised in that also included in the resource pool on
The ageing time of the resource pool；
Methods described also includes：
When the storage time that the resource pool is stored in the dns-proxy server exceedes the ageing time
When, abandon the resource pool.
4. method according to claim 1 and 2, it is characterised in that the link information also includes and chain
Road IP address is corresponding can quantity allotted；
Methods described also includes：
The Target Link IP address that the Target Link information includes is carried being sent to the client
After first DNS response messages, by the Target Link IP address it is corresponding can quantity allotted subtract one, until right
Answer can quantity allotted be 0 when, the Target Link IP address be no longer used to distribution；
Also, when at least one link information include it is corresponding with link IP address can quantity allotted all
For 0 when, abandon the resource pool.
5. method according to claim 4, it is characterised in that methods described also includes：
When the resource pool is abandoned, the second DNS request message, the 2nd DNS are sent to the LB equipment
Request message carries domain name information, so that the LB equipment regenerates the corresponding money of domain name information
Source pond；
Receive the second of the corresponding resource pool of domain name information that the carrying that the LB equipment sends is regenerated
DNS response messages.
6. a kind of link scheduling method, it is characterised in that be applied to load balancing LB equipment, methods described bag
Include：
The second DNS request message that dns-proxy server sends is received, in the second DNS request message
Domain-name information is carried, domain name information is the DNS that client sends to the dns-proxy server
The domain-name information that request message is carried；
According to domain name information resource pool of the generation comprising at least one link information, wherein, each link
Information includes the corresponding link IP address of domain name information, and the link information has unique with link IP address
Correspondence；
Generation and the 2nd DNS response messages corresponding to the second DNS request message, wherein, described the
The resource pool is carried in two DNS response messages；
The 2nd DNS response messages, the 2nd DNS response reports are sent to the dns-proxy server
Text carries the resource pool, so that：The dns-proxy server determines Target Link from the resource pool
Information, and send the first of the Target Link IP address that the carrying Target Link information includes to the client
DNS response messages.
7. method according to claim 6, it is characterised in that the link information also includes and link IP
Address it is corresponding can quantity allotted so that the dns-proxy server to the client send carry institute
After stating a DNS response messages of the Target Link IP address that Target Link information includes, by the object chain
Road IP address it is corresponding can quantity allotted subtract one, until it is corresponding can quantity allotted be 0 when, the Target Link
IP address is no longer used to distribution；Also,
The dns-proxy server ought judge at least one link information includes and link IP address
It is corresponding can quantity allotted when being all 0, abandon the resource pool.
8. a kind of link scheduling device, it is characterised in that be applied to domain name system DNS proxy server, institute
Stating device includes：First request message receiver module, resource pool determining module, first object information determine mould
Block and the first response message sending module；
The first request message receiver module：The first DNS request message for receiving client transmission,
The first DNS request message carries domain-name information；
The resource pool determining module：For the domain name letter for determining to be obtained from load balancing LB device requests
Corresponding resource pool is ceased, wherein, the resource pool includes at least one link information, each link information
Including link IP address corresponding with domain name information, it is unique right that the link information has with link IP address
Ying Xing；
The first object information determination module：For at least one chain included from the resource pool
In the information of road, Target Link information is determined；
The first response message sending module：The Target Link letter is carried for being sent to the client
First DNS response messages of the Target Link IP address that breath includes.
9. device according to claim 8, it is characterised in that described device also includes：Second request
Message sending module and the second response message receiver module；
The second request message sending module：Obtained from the LB device requests for that ought be stored with locally
Domain name information corresponding resource pool when, send the second DNS request message to the LB equipment, it is described
Second DNS request message carries domain name information, so that LB equipment generation domain name information correspondence
Resource pool；
The second response message receiver module：For receiving the carrying resource pool that the LB equipment sends
The 2nd DNS response messages.
10. device according to claim 8 or claim 9, it is characterised in that also comprising closing in the resource pool
In the ageing time of the resource pool；
Described device also includes the first discard module；
First discard module：Storage for being stored in the dns-proxy server when the resource pool
When time exceedes the ageing time, the resource pool is abandoned.
11. device according to claim 8 or claim 9, it is characterised in that the link information also include with
Link IP address is corresponding can quantity allotted；
Described device also includes can quantity allotted subtract one module and the second discard module；
It is described can the quantity allotted module that subtracts：For sending the carrying Target Link letter to the client
After first DNS response messages of the Target Link IP address that breath includes, by the Target Link IP address
It is corresponding can quantity allotted subtract one, until it is corresponding can quantity allotted be 0 when, the Target Link IP address is not
It is used further to distribution；
Second discard module：For including when at least one link information and link IP address pair
Answer can quantity allotted when being all 0, abandon the resource pool.
12. devices according to claim 11, it is characterised in that described device also includes the 3rd request
Message sending module and the 3rd response message receiver module；
The 3rd request message sending module：For when the resource pool is abandoned, being sent out to the LB equipment
The second DNS request message is sent, the second DNS request message carries domain name information, so that the LB
Equipment regenerates the corresponding resource pool of domain name information；
The 3rd response message receiver module：For receiving what the carrying that the LB equipment sends was regenerated
2nd DNS response messages of the corresponding resource pool of domain name information.
13. a kind of link scheduling devices, it is characterised in that be applied to load balancing LB equipment, described device
Including：Second request message receiver module, resource pool generation module, the second response message generation module and
Two response message sending modules；
The second request message receiver module：The 2nd DNS for receiving dns-proxy server transmission please
Message is sought, domain-name information is carried in the second DNS request message, domain name information is client to institute
State the domain-name information that the first DNS request message of dns-proxy server transmission is carried；
The resource pool generation module：For including at least one link information according to the generation of domain name information
Resource pool, wherein, each link information include the corresponding link IP address of domain name information, the link
Information has unique correspondence with link IP address；
The second response message generation module：For generate with corresponding to the second DNS request message
2nd DNS response messages, wherein, carry the resource pool in the 2nd DNS response messages；
The second response message sending module：For sending described second to the dns-proxy server
DNS response messages, the 2nd DNS response messages carry the resource pool, so that：The DNS proxy
Server determines Target Link information from the resource pool, and sends the carrying target to the client
First DNS response messages of the Target Link IP address that link information includes.
14. devices according to claim 13, it is characterised in that the link information also includes and chain
Road IP address it is corresponding can quantity allotted so that the dns-proxy server to the client send carry
After first DNS response messages of the Target Link IP address that the Target Link information includes, by the target
Link IP address it is corresponding can quantity allotted subtract one, until it is corresponding can quantity allotted be 0 when, the object chain
Road IP address is no longer used to distribution；Also,
The dns-proxy server ought judge at least one link information includes and link IP address
It is corresponding can quantity allotted when being all 0, abandon the resource pool.
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| CN114629822A (en) * | 2022-04-18 | 2022-06-14 | 北京小米移动软件有限公司 | Link detection method and device, electronic equipment and storage medium |
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