CN101938427B - Re-directing method and device in global load balance - Google Patents
Re-directing method and device in global load balance Download PDFInfo
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- CN101938427B CN101938427B CN2010102920876A CN201010292087A CN101938427B CN 101938427 B CN101938427 B CN 101938427B CN 2010102920876 A CN2010102920876 A CN 2010102920876A CN 201010292087 A CN201010292087 A CN 201010292087A CN 101938427 B CN101938427 B CN 101938427B
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Abstract
The invention discloses a re-directing method and a re-directing device in global load balance. The method comprises the following steps that: load balance equipment receives a hyper text transmission protocol (HTTP) request from a client and acquires information of station, which have sent re-directing messages to the client, from the hyper text transmission protocol (HTTP) request; the load balance equipment selects stations except the stations which have sent the re-directed messages from a station list, wherein the selected stations serve as the re-directed stations; the load balance equipment generates the re-directed message according to the selected re-directed stations, wherein the load balance device adds the information of the station of the load balance device is and the acquired information of the stations which have sent the re-directed messages into the re-directed messages as the information of the stations which have sent the re-directed messages; and the load balance equipment sends the re-directed messages to the client. Repeated re-direction in the global load balance can be avoided and the availability and the reliability of a global load balance service are improved by using the method and the device.
Description
Technical field
The present invention relates to communication technical field, particularly relate to reorientation method and device in a kind of GSLB.
Background technology
Along with the raising of network traffic, and the quick growth of quantity and data traffic, the disposal ability of each core of existing network and calculating strength also correspondingly increase, and make single server apparatus can't bear whole network tasks at all.To above-mentioned situation; Networking technology area has proposed load balancing (Load Balance; Hereinafter to be referred as: LB) technology, with bandwidth, increase throughput, strengthen network data-handling capacity, raising network more flexible and the availability of expansion conventional network equipment and server.
According to the difference of the network design of load-balancing device, load-balancing technique can comprise the local load balancing (Local Load Balance, hereinafter to be referred as: LLB) and GSLB (Global Load Balance, hereinafter to be referred as: GLB).
As shown in Figure 1, be local load balancing sketch map of the prior art.Server cluster concentrates on a physical location, and load-balancing device is positioned at the server cluster outside, and the service access that the user end to server cluster is initiated carries out distribution processor.
As shown in Figure 2, be GSLB sketch map of the prior art.Server cluster is distributed in diverse geographic location, and the front end of each server cluster is all disposed a GLB equipment, and collaborative work between each GLB equipment is distributed the service access from client.GSLB can provide fully transparent service for the user, makes the user need not to be concerned about the physical distribution of server cluster, can effectively avoid the single point failure of server cluster, improves the response speed of server cluster through access modes nearby.For the local load balancing, GSLB is more reliable, can better service experience be provided to calling party.
The strategy that GSLB uses comprises HTTP (Hyper Text Transfer Protocol, HTTP) redirecting technique, and this technology can be directed to optimum website with customer flow through the redirection message based on http protocol.As shown in Figure 3, be the HTTP redirection sketch map of GSLB of the prior art.User end to server cluster I sends get (obtaining) request; The LB equipment I is found the whole faults of home server after receiving the get request, need the get request be redirected on the server cluster II, so return HTTP redirection message (shown in the solid line flow process among Fig. 3) to client; After client is received redirection message, initiate new HTTP request (shown in the dotted line flow process among Fig. 3) to being redirected destination address.
Yet, in the HTTP redirection process of above-mentioned GSLB, can appear at the problem that repeats to be redirected between a plurality of websites.For example, when server cluster I and server cluster II break down, the get request may occur and be redirected to server cluster II, be redirected back server cluster I from server cluster II again, cause business unavailable from server cluster I.
For addressing the above problem, existing system is through between website, increasing the proprietary protocol alternant way, to evade the problem that repeats to be redirected.For example, there are three server clusters in the GSLB system, are respectively server cluster I, server cluster II and server cluster III.Carry out proprietary protocol between three server clusters and communicate, respectively report available server number separately.Servers-all in server cluster I breaks down; When needing to select to be redirected website; Can in having the website of available server, select the website of an optimum; If do not have available server among the server cluster II, there is available server among the server cluster III, then the get request directly is redirected to server cluster III.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Because the proprietary protocol communication between the website needs certain call duration time, and in this call duration time the redirected selection mistake of short time can take place.And, the service provider of high reliability being provided for needs in visit peak time, the selection mistake of short time also is unacceptable.Therefore, prior art can't solve the problem that is redirected that repeats in the GSLB, can't guarantee the reliability that GSLB is professional.
Summary of the invention
The present invention provides reorientation method and the device in a kind of GSLB, in order to solve the problem that is redirected that repeats in the GSLB.
The present invention proposes the reorientation method in a kind of GSLB, comprising:
Load-balancing device receives the HTTP HTTP request from client, obtains the information of sending the website of redirection message to said client of carrying in the said HTTP request;
Said load-balancing device is selected the website except that the said website that sent redirection message from site list, as this redirected website;
Said load-balancing device generates redirection message according to the redirected website of selecting; Wherein, said load-balancing device with the information of its place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message;
Said load-balancing device sends to said client with said redirection message.
Wherein, said client generates the HTTP request in the following manner:
Said client receives this redirection message that is redirected load-balancing device transmission before; Obtain the uniform resource position mark URL information of carrying in the said before redirection message that load-balancing device sends, the information that the oriented said client of inquiry query partial record in the said URL information was sent the website of redirection message;
Said client generates the HTTP request that comprises said URL information.
Wherein, when not carrying in the said HTTP request when said client was sent the information of website of redirection message, said load-balancing device is selected this redirected website from said site list;
Said load-balancing device generates redirection message according to the redirected website of selecting; Wherein, said load-balancing device adds the information of its place website in the said redirection message to as the information of sending the website of redirection message to said client;
Said load-balancing device sends to said client with said redirection message.
Wherein, said load-balancing device with the information of its place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message, be specially:
Said load-balancing device obtains URL information from the HTTP request of the client that receives, and the information of this load-balancing device place website added to is used to write down the query part of information of sending the website of redirection message to said client in this URL information;
Said load-balancing device generates the URL information of said redirection message according to this URL information of having added site information.
Wherein, the information of said website comprises at least a in IP address and the site identity of said website.
The present invention also proposes a kind of load-balancing device, comprising:
Acquisition module is used to receive the HTTP request from client, obtains the information of sending the website of redirection message to said client of carrying in the said HTTP request;
Select module, be used for selecting the website except that the said website that sent redirection message, as this redirected website from site list;
Generation module; Be used for generating redirection message according to the redirected website that said selection module is selected; Wherein, said generation module with the information of said load-balancing device place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message;
Sending module is used for the redirection message that said generation module generates is sent to said client.
Wherein, said selection module also is used for not carrying when said client was sent the information of website of redirection message in said HTTP request, from said site list, selects this redirected website;
Said generation module; Also be used for generating redirection message according to the redirected website that said selection module is selected; Wherein, said generation module adds the information of said load-balancing device place website in the said redirection message to as the information of sending the website of redirection message to said client.
Wherein, Said generation module; Specifically be used for obtaining URL information, and the information of said load-balancing device place website added to be used to write down the query part of information of sending the website of redirection message to said client in this URL information from the HTTP request of the client that receives; Generate the URL information of said redirection message according to this URL information of having added site information.
Wherein, the information of said website comprises at least a in IP address and the site identity of said website.
Compared with prior art; The present invention has the following advantages: the information that obtains sending to client the website of redirection message according to the HTTP request of client; And according to the redirected website of the Information Selection of this website; Repeating between the different server cluster of having avoided occurring in the redirection process of GSLB is redirected, and improves GSLB availability of traffics and reliability.
Description of drawings
Fig. 1 is a local load balancing sketch map of the prior art;
Fig. 2 is a GSLB sketch map of the prior art;
Fig. 3 is the HTTP redirection sketch map of GSLB of the prior art;
Fig. 4 is the HTTP redirection sketch map of the GSLB in the embodiment of the invention;
Fig. 5 is the reorientation method flow chart in the GSLB in the embodiment of the invention;
Fig. 6 is the structural representation of the load-balancing device in the embodiment of the invention.
Embodiment
In the technical scheme that the embodiment of the invention provides, load-balancing device receives the HTTP HTTP request from client, obtains the information of sending the website of redirection message to client of carrying in this HTTP request; Load-balancing device is selected the website except that the website that sent redirection message from site list, as this redirected website; Load-balancing device generates redirection message according to the redirected website of selecting; Wherein, Load-balancing device with the information of its place website with the transmission that gets access to the information of website of redirection message add in the redirection message as the information of the website that sent redirection message; And this redirection message sent to client, thereby avoid repeating in the GSLB to be redirected.
To combine the accompanying drawing among the present invention below, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.
As shown in Figure 4; HTTP redirection sketch map for the GSLB in the embodiment of the invention; Comprise client, server cluster I, the LB equipment I that is connected with server cluster I, server cluster II, the LB equipment I I, the server cluster III that are connected with server cluster II, and the LB equipment I II that is connected with server cluster III.Usually, safeguarding in each LB equipment has site list, comprises the information of each website in this site list, and promptly available conduct is redirected the information of the LB equipment of website.When the get request that the LB equipment interconnection is received is redirected, can from this site list, select to be redirected website.
In above-mentioned framework, client is sent the get request to the LB equipment I, carries the destination address of the IP address of LB equipment I as this get request in this get request, and promptly the URL in this get request is expressed as: http: // 1.1.1.1.When with server cluster I that the LB equipment I is connected in when not having available server (being that LB equipment I place website can't respond this get request); The LB equipment I selects LB equipment I I as redirected website according to site list, and generates redirection message according to the information of LB equipment I I, and this redirection message is sent to client; The URL of this redirection message (Universal Resource Locator; The information of sending the website of redirection message to client is also carried in the above-mentioned URL information, i.e. the identification parameter of LB equipment I as being redirected site address in the IP address of URL) carrying LB equipment I I in the information; Wherein, The identification parameter of LB equipment I can be arranged in the URL information, like the URL information representation of redirection message be: http: // 2.2.2.2? SrvKey=01010101, wherein; Http is the content of scheme (communication protocol) part in the URL information, representes this URL information use http protocol; 2.2.2.2 be the content of host (main frame) part in the URL information, expression is redirected site address, the i.e. address of LB equipment I I; SrvKey=01010101 is the content of query (inquiry) part in the URL information, and expression LB equipment I was sent redirection message (the 01010101st, the identification parameter of LB equipment I) to client.
Client receives the redirection message from the LB equipment I; Obtain the URL information of carrying in this redirection message, generate the get request that comprises this URL information, and send this get request to LB equipment I I; URL information in this get request comprises the destination address of the IP address of LB equipment I I as this get request; The information that the oriented client of query partial record of this URL information was sent the website of redirection message, for example, the identification parameter of LB equipment I.In concrete the realization; According to existing protocol, client can directly be asked the URL information of redirection message as the get that generates URL information, that is: http: // 2.2.2.2? SrvKey=01010101; Wherein, 2.2.2.2 be the address of targeted sites (being LB equipment I I), SrvKey=01010101 representes to send to client the information of the website of redirection message, is the identification parameter of LB equipment I here.If with do not have available server among the server cluster II that LB equipment I I is connected yet, LB equipment I I carries out re-orientation processes to the get request that receives, this re-orientation processes flow process is as shown in Figure 5, may further comprise the steps:
In this step; After client receives the redirection message of LB equipment I transmission; URL information through resolving in this message knows that being redirected website is LB equipment I I place website; And send the get that comprises above-mentioned URL information to LB equipment I I and ask, be carried at the information of sending the website of redirection message to this client in this GSLB process in this URL information, be the information of LB equipment I place website here.In embodiments of the present invention, can the URL information in this get request message be expressed as: http: // 2.2.2.2? SrvKey=01010101.
The information of wherein, sending the website of redirection message to client can be identification parameter.This identification parameter can be the SrvKey parameter, and this parameter is corresponding with the IP address of website, can generate according to the IP address.For example; In the present embodiment; The website that sent redirection message is the LB equipment I, and the IP address of LB equipment I is 1.1.1.1, can every section of this IP address be converted to two decimal number; And every section decimal number that is converted to merged, corresponding SrvKey parameter can be " SrvKey=01010101 ".Need to prove; Because the every section decimal number maximum that can represent of IP address is no more than 255; Also can every section of IP address be converted to three decimal integer; And the result that will change merges, and obtains corresponding SrvKey parameter, can guarantee the one-to-one relationship of identification parameter and IP address like this.
Particularly; The transmission that in get request, comprises the site information of redirection message be expressed as under the situation of site identity parameter; When for example sending the identification parameter " SrvKey=01010101 " of the website of redirection message; LB equipment can be through resolving this identification parameter, obtains sending the IP address of the website of redirection message, i.e. 1.1.1.1.Owing to comprise the IP address (the IP address of LB equipment is the IP address of this equipment place website) that available conduct is redirected the LB equipment of website in the site list; The IP address that LB equipment I I selects to be different from 1.1.1.1 from this site list is as Redirect Address, and the LB equipment corresponding with Redirect Address is redirected website.LB equipment I I can duplicate a site list copy to this client; And the IP address that will send the website of redirection message from this site list copy, delete or be labeled as unavailable, with the website avoiding selecting to send redirection message as redirected website.
Need to prove, after execution of step, continue execution in step 505.
Particularly, do not carry in the get request when client was sent the information of website of redirection message when LB equipment I I judges, LB equipment I I selects redirected website from site list.
LB equipment I I is when generating redirection message, and the information that himself is belonged to website is added in this redirection message as the site information of sending redirection message to client.Particularly; The transmission of in get request, carrying the site information of redirection message be expressed as under the situation of site identity parameter; LB equipment I I can calculate corresponding identification parameter according to its own IP address, and this identification parameter is added in the query part of the URL information that from the get request, obtains.In the present embodiment; When the IP address of LB equipment I I is 2.2.2.2; Corresponding SrvKey parameter can be " 02020202 "; URL during the received get of LB equipment I I asks is expressed as: " http: // 2.2.2.2/? SrvKey=01010101 ", wherein, the website of redirection message was sent in identification parameter " SrvKey=01010101 " expression to client; At this moment; LB equipment I I adds the identification parameter " 02020202 " of himself in this URL information to, obtained adding the URL information of site information: http: // 2.2.2.2/? SrvKey=0101010102020202 promptly representes to the website that client was sent redirection message to be the website at LB equipment I and LB equipment I I place.
When LB equipment I I resolves the URL information that being used to of obtaining represent to send to client the website of redirection message from get request is http: during // 2.2.2.2/; Show the website that did not also send redirection message at present to client; After LB equipment I I adds himself identification parameter the query part of this URL information to; Can this URL information be expressed as http: // 2.2.2.2/? SrvKey=02020202 shows that working as the forward direction client sent the website that the website of redirection message is LB equipment I I place.
LB equipment I I is when generating redirection message; Generate the URL information of redirection message according to the URL information of having added site information; Promptly keep the query part that this has added the URL information of site information; This has been added the information that host in the URL information of site information partly replaces with the redirected website of selecting, the information that the is redirected website IP address of directed website of can attaching most importance to.
The URL information of the redirection message that LB equipment I I generates can be expressed as the form of Location (position) information; Carry the IP address of being redirected website in this Location information; And the information of sending the website of redirection message to client, like the site identity parameter that adopts the URL mode to represent.For example; When redirected website is LB equipment I II; The IP address of LB equipment I II is 3.3.3.3; When the website that sent redirection message to client was the website at LB equipment I and LB equipment I I place, the Location information in the redirection message that LB equipment I I generates was: " Location:http: // 3.3.3.3/? SrvKey=0101010102020202 ".
Need to prove; In other execution modes of the present invention; Client also can be carried the information such as IP address or site identity of the website that sent redirection message in the get request that LB equipment sends, with the identification parameter of the website that replaces sending redirection message.LB equipment also can carry the information such as IP address or site identity of this website that sent redirection message in the redirection message that client is sent, with the identification parameter of the website that replaces sending redirection message.
In other execution modes of the present invention, can also be carried in other HTTP requests except that the get request to the information that client was sent the website of redirection message and to send to LB equipment, for example, be carried in the post request.
Can find out according to above description; Through in redirection message and HTTP request, adding the information of sending the website of redirection message to client; Thereby assist follow-up website to select to be redirected website; Repeating between the different server cluster of having avoided occurring in the redirection process of GSLB is redirected, and improved GSLB availability of traffics and reliability.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.
According to the reorientation method in the GSLB that provides in the above-mentioned execution mode, the embodiment of the invention also provides the device of using above-mentioned reorientation method.
As shown in Figure 6, the structural representation for the load-balancing device in the embodiment of the invention comprises:
Wherein, the information of website comprises the IP address, site identity of website and the identification parameter that is used for this website of unique identification that generates according to the IP address at least a.
Particularly, select the module 620 can be, and from the site list of getting rid of this unavailable website, select to be redirected website with the website that sent redirection message as unavailable website.
Particularly; Generation module 630 can obtain URL information from the HTTP request of the client that receives, and the information that load-balancing device belongs to website added to is used to write down the query part of information of sending the website of redirection message to client in this URL information; Generate the URL information of redirection message according to this URL information of having added site information.
Sending module 640 is used for the redirection message that generation module 630 generates is sent to client.
In addition, when not carrying in HTTP that acquisition module 610 the receives request when client was sent the information of website of redirection message, above-mentioned selection module 620 also is used at the redirected website of selecting this from site list; Correspondingly; Above-mentioned generation module 630; Also be used for generating redirection message according to the redirected website of selecting module 620 to select; Wherein, generation module 630 information that load-balancing device belonged to website is added in the redirection message as the information of sending the website of redirection message to client.
Embodiments of the invention comprise following advantage; Through in redirection message and HTTP request, adding the information of sending the website of redirection message to client; Assist follow-up website to select to be redirected website; Repeating between the different server cluster of having avoided occurring in the redirection process of GSLB is redirected, and improves GSLB availability of traffics and reliability.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium, comprise some instructions with so that a station terminal equipment (can be mobile phone, personal computer; Server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
Claims (9)
1. the reorientation method in the GSLB is characterized in that, comprising:
Load-balancing device receives the HTTP HTTP request from client, obtains the information of sending the website of redirection message to said client of carrying in the said HTTP request;
Said load-balancing device is selected the website except that the said website that sent redirection message from site list, as this redirected website;
Said load-balancing device generates redirection message according to the redirected website of selecting; Wherein, said load-balancing device with the information of its place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message;
Said load-balancing device sends to said client with said redirection message.
2. the method for claim 1 is characterized in that, said client generates the HTTP request in the following manner:
Said client receives this redirection message that is redirected load-balancing device transmission before; Obtain the uniform resource position mark URL information of carrying in the said before redirection message that load-balancing device sends, the information that the oriented said client of inquiry query partial record in the said URL information was sent the website of redirection message;
Said client generates the HTTP request that comprises said URL information.
3. the method for claim 1 is characterized in that, also comprises:
When not carrying in the said HTTP request when said client was sent the information of website of redirection message, said load-balancing device is selected this redirected website from said site list;
Said load-balancing device generates redirection message according to the redirected website of selecting; Wherein, said load-balancing device adds the information of its place website in the said redirection message to as the information of sending the website of redirection message to said client;
Said load-balancing device sends to said client with said redirection message.
4. the method for claim 1; It is characterized in that; Said load-balancing device with the information of its place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message, be specially:
Said load-balancing device obtains URL information from the HTTP request of the client that receives, and the information of this load-balancing device place website added to is used to write down the query part of information of sending the website of redirection message to said client in this URL information;
Said load-balancing device generates the URL information of said redirection message according to this URL information of having added site information.
5. like each described method in the claim 1 to 4, it is characterized in that the information of said website comprises at least a in IP address and the site identity of said website.
6. a load-balancing device is characterized in that, comprising:
Acquisition module is used to receive the HTTP request from client, obtains the information of sending the website of redirection message to said client of carrying in the said HTTP request;
Select module, be used for selecting the website except that the said website that sent redirection message, as this redirected website from site list;
Generation module; Be used for generating redirection message according to the redirected website that said selection module is selected; Wherein, said generation module with the information of said load-balancing device place website with the transmission that gets access to the information of website of redirection message add in the said redirection message as the information of the website that sent redirection message;
Sending module is used for the redirection message that said generation module generates is sent to said client.
7. equipment as claimed in claim 6 is characterized in that,
Said selection module also is used for not carrying when said client was sent the information of website of redirection message in said HTTP request, from said site list, selects this redirected website;
Said generation module; Also be used for generating redirection message according to the redirected website that said selection module is selected; Wherein, said generation module adds the information of said load-balancing device place website in the said redirection message to as the information of sending the website of redirection message to said client.
8. equipment as claimed in claim 6 is characterized in that,
Said generation module; Specifically be used for obtaining URL information, and the information of said load-balancing device place website added to be used to write down the query part of information of sending the website of redirection message to said client in this URL information from the HTTP request of the client that receives; Generate the URL information of said redirection message according to this URL information of having added site information.
9. like each described equipment of claim 6 to 8, it is characterized in that the information of said website comprises at least a in IP address and the site identity of said website.
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| CN103297472B (en) * | 2012-03-01 | 2018-09-04 | 上海盛大网络发展有限公司 | A kind of reorientation method and content distribution nodes applied to content distributing network |
| CN103312807B (en) * | 2013-06-20 | 2016-12-28 | 华为技术有限公司 | Data transmission method, apparatus and system |
| CN103873564B (en) * | 2014-02-28 | 2018-09-25 | 浪潮通用软件有限公司 | A method of realizing SignalR duplex communications under the conditions of balanced multi-server load |
| CN106169963B (en) * | 2016-09-20 | 2019-07-23 | 北京百度网讯科技有限公司 | The access method and system of service page, proxy server |
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| CN101286884A (en) * | 2008-05-15 | 2008-10-15 | 杭州华三通信技术有限公司 | Method for implementing non-status multi-host backup and proxy gateway |
| CN101325552A (en) * | 2008-08-01 | 2008-12-17 | 杭州华三通信技术有限公司 | Triangle forwarding method for access request and GLB server |
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| CN101938427A (en) | 2011-01-05 |
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