CN1391378A - Connection switching system at front end of server cluster and its switching method - Google Patents
Connection switching system at front end of server cluster and its switching method Download PDFInfo
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- CN1391378A CN1391378A CN01129313A CN01129313A CN1391378A CN 1391378 A CN1391378 A CN 1391378A CN 01129313 A CN01129313 A CN 01129313A CN 01129313 A CN01129313 A CN 01129313A CN 1391378 A CN1391378 A CN 1391378A
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Abstract
A TCP connection switching system in the front of server cluster and its switching method for transferring the data packet to stand-by server when a server is failed are disclosed. Said system can cut off the TCP connection between user and the server and create the TCP connection to user and server. When the server is failed, it can replace the server to transmit and receive messages while create a TCP connection to stand-by server. The connection to user is created again.
Description
The present invention relates to the webserver, relate in particular between user and server and set up the system and method that TCP (transmission control protocol) is connected.
At present, in network server system, be extensive use of load-balancing device at the server farm front end, as 4/7 layer switch, at first, the webserver is organized into groups, each station server provides identical service in the group, at the front end of this group server, places one 4/7 layer switch, asking the user wheel to be transmitted by 4/7 layer switch delivers on the server, this has not only solved the load sharing problem of each station server, and has improved reliability of service to a certain extent, when certain station server in the group breaks down, all TCP on this station server connect interruption, and ongoing request can not get service.But, can detect failed server by 4/7 layer switch, the user is as long as initiate request again, and 4/7 layer switch just no longer is forwarded to new user's request on this station server, and by other server service in the group.
Along with IP (Internet protocol) internet voice business, as developing rapidly of business such as IP phone, make the online audio call of process IP, finish the call server that is equivalent to the call-handling capability on the narrowband speech switch and disposed in a large number, like this, satisfy the public telephone network required standard with regard to the reliability that needs server category equipment.If server category equipment is still adopted the prior art scheme that 4/7 layer switch is set, so, when server breaks down, the calling of carrying out on this server is all interrupted, even the fault that detects 4/7 layer switch takes place and no longer new user is asked to be forwarded on this station server, but still fail to avoid a large amount of call losses of having taken place, all interrupted callings all will be initiated again by the user.At this type of situation, still there is not the solution of when server breaks down, avoiding call loss in the prior art.
The objective of the invention is to: at deficiency of the prior art, a kind of connection exchanging system and reverse method thereof that is arranged at the server farm front end is provided, being connected on the server is switched to when breaking down on the backup server corresponding with this server proceeds, thereby improve service reliability.
For achieving the above object, the technical solution used in the present invention is: a kind ofly be arranged at the server farm front end and the connection exchanging system to the backup server corresponding with this server of when server breaks down the transmission of packet being continued, this connects exchanging system by the user port module, the Service-Port module, main processing block and server detection module are formed and are had a system ip address, it is source address with the IP address that described user port module is used for the packet from user side, with the user port number is source port number, with the system ip address is destination address, with the system end slogan is that user side TCP connection set up in the destination slogan, and to packet specified address switching motion; Described Service-Port module is used for that server is set up TCP and connects, to be source address with the server ip address from the packet of server end, be source port number with the server end slogan, be destination address with the IP address, be the destination slogan with the user port number, and to packet specified address switching motion; Described main processing block be used for to user side TCP connection status, server end TCP connection status, user side data packet delivery serial number and server end data bag pass order number write down and handle make belong to same stream packet between user side and server end by the address transition bi-directional; Described server detection module is used to detect the server failure generation and sends fault generation information to main processing block and server port module.
Connect continue reverse method to the backup server corresponding of the transmission that is used in the exchanging system when server breaks down packet with this server, it is characterized in that: when described server detection module detects server and breaks down, carry out according to following step:
A, Service-Port module are deleted the record about server;
B, the address transition of revising in the user port module are moved, and transfer packet to main processing block;
C, main processing block send to user side and reply, and simultaneously according to record, use IP address and user port number to send request to backup server, set up TCP and connect, and add the record of this backup server in the Service-Port module;
D, revise address transition action in user port module and the server port module according to the IP address of backup server and port numbers; And number current data packet is carried out the serial number conversion according to the user side data packet delivery serial number of main processing block record and server end data bag pass order.
Because the present invention has adopted above connection exchanging system and reverse method, the TCP that is blocked between user and the server by the connection exchanging system connects, and is connected and set up TCP with the user with server respectively.For the user, connect exchanging system and pretend to be server; And for server, connect exchanging system and pretend to be the user again, system is connected two TCP by operations such as address transition and connects.When server breaks down, connect exchanging system and pretend to be the server messaging, keep being connected, simultaneously, initiate again to be connected with the TCP of backup server with client's TCP, after connection is set up successfully, connect exchanging system by the conversion of TCP serial number, be connected two TCP once more and connect, avoided the connection on the server to hinder for some reason and interrupt, service is switched on the backup server proceeds, improved reliability of service.
Below in conjunction with drawings and Examples technical solution of the present invention is described further.
Fig. 1 is the overall construction drawing that connects exchanging system among the present invention program;
Fig. 2 is the flow chart of reverse method among the present invention program.
With reference to Fig. 1, connecting exchanging system is made up of user port module, Service-Port module, main processing block and server detection module and has a system ip address, this IP address is to the disclosed virtual ip address of user, the user port module is connected with the user, and the Service-Port module is connected with server.User port module and Service-Port mould are respectively equipped with user side stream table and server end stream table, with the stream of the TCP under these five field identification packets of source address, source port number, protocol number, destination address and destination slogan, also comprise processing action in the stream table to packet.Described user port module is used for the packet from user side is source address with the IP address, is source port number with the user port number, be destination address with the system ip address, be that the destination slogan is set up user side TCP and connected with the system end slogan, and to packet specified address switching motion; Described Service-Port module is used for that server is set up TCP and connects, to be source address with the server ip address from the packet of server end, be source port number with the server end slogan, be destination address with the IP address, be the destination slogan with the user port number, and to packet specified address switching motion; Described main processing block is provided with TCP controll block table, be used for to user side TCP connection status, server end TCP connection status, user side data packet delivery serial number and server end data bag pass order number write down and handle make belong to same stream packet between user side and server end by the address transition bi-directional; Described server detection module is used to detect the server failure generation and sends fault generation information to main processing block and server port module.
The initiation that connects with a TCP below, formation illustrate the course of work that connects exchanging system among the present invention program.
At first, the user sends the TCP initial package, is initiated to the TCP that connects exchanging system and connects.Five fields that identify this bag are IP address, user port number, TCP, system ip address, system end slogan, and this bag arrives and connects the exchanging system user port.Because this bag is the initial package of stream, user port module notice main processor modules and server port module for this new TCP flow distribution TCP controll block, also distribute list item in two stream tables.Then, determine main IP address with server by main processor modules, the address transition action in content of in each list item, inserting and the stream table, the TCP serial number in the TCP controll block table etc., and set up related.
In the 2nd step, according to the address transition action during Already in stream is shown, connection is dealt into the main server of using by the user port module.
In the 3rd step, server echo reply bag, this bag arrive and connect the exchanging system Service-Port.Five fields that identify this bag are server ip address, server end slogan, TCP, IP address, user port number.By the retrieval in server end stream table of Service-Port processing module, retrieve the list item of this TCP stream.Then, list items such as the tcp state in the corresponding TCP controll block table of Service-Port processing module elder generation change, serial number carry out the address transition operation according to the content of server end stream table again.
In the 4th step, the Service-Port module sends response packet according to the action regulation in the stream table to the user.
In the 5th step, the user port module is received the follow-up data bag that the user sends, and goes out the list item of this TCP stream in the table search of user side stream.List items such as the tcp state in the corresponding TCP controll block table of elder generation's change, serial number carry out the address transition operation according to the content of user side stream table more then.
In the 6th step, the user port module sends packet according to the action regulation in the user side stream table to server.
Connection exchanging system of the present invention can be provided with a plurality of external interfaces, and the user is connected by the said external interface with the Service-Port module with user port module, server.Described external interface can adopt Ethernet interface, DDN (Digital Data Net) interface, interface (being connected to the online packet type data terminal equipment of public data and the interface between the data with special circuit) etc. X.25.
When the server detection module detects server and breaks down, send fault generation information to main processing block and server port module.Connect exchanging system and begin to carry out and switches, the transmission of packet is continued to the backup server corresponding with this server, described server and corresponding with it backup server can be followed the backed up in synchronization agreement.Below, describe the execution in step of reverse method in detail in conjunction with Fig. 2.
At first, execution in step A, the deletion of Service-Port module is about the record of server, as server ip address, the server end slogan in the server end stream table.Execution in step B revises the address transition action in the user port module again, transfers packet to main processing block, and so far, the TCP that has cut off server end connects.Execution in step C then, main processing block sends to user side and replys, simultaneously according to record, use IP address and user port number to send request to backup server, setting up TCP connects, and in the Service-Port module, add the record of this backup server, as server ip address, server end slogan.Wherein main processing block sends to user side and replys, and can be notice user side retransmission data bag, its essence is and pretends to be the TCP server to response, and the connection of user side is kept; And meanwhile, foundation is connected with the TCP of backup server, with IP address, the port numbers adding server end stream table of backup server.Last execution in step D moves according to the address transition that the IP address and the port numbers of backup server are revised in user port module and the server port module; And number current data packet is carried out the serial number conversion according to the user side data packet delivery serial number of main processing block record and server end data bag pass order.Because backup server is to add midway, so, actual N the packet of the 1st packet that server end transmits for the user side transmission, and record user side data packet delivery serial number and server end data bag pass order number in the main processing block, carry out the serial number conversion according to record, guaranteed that corresponding relation is correct,, user side TCP connection has been connected with server end TCP once more is connected through above-mentioned switching.Recover normal when main with server, also can the main server of using be switched back in connection according to equal step.
Other modification that those skilled in the art make according to technical solution of the present invention are also within protection range of the present invention.
Claims (5)
1, a kind ofly be arranged at the server farm front end and the connection exchanging system to the backup server corresponding of when server breaks down, the transmission of packet being continued with this server, it is characterized in that: described connection exchanging system is by the user port module, the Service-Port module, main processing block and server detection module are formed and are had a system ip address, it is source address with the IP address that described user port module is used for the packet from user side, with the user port number is source port number, with the system ip address is destination address, with the system end slogan is that user side TCP connection set up in the destination slogan, and to packet specified address switching motion; Described Service-Port module is used for that server is set up TCP and connects, to be source address with the server ip address from the packet of server end, be source port number with the server end slogan, be destination address with the IP address, be the destination slogan with the user port number, and to packet specified address switching motion; Described main processing block be used for to user side TCP connection status, server end TCP connection status, user side data packet delivery serial number and server end data bag pass order number write down and handle make belong to same stream packet between user side and server end by the address transition bi-directional; Described server detection module is used to detect the server failure generation and sends fault generation information to main processing block and server port module.
2, connection exchanging system as claimed in claim 1 is characterized in that: this connection exchanging system is provided with a plurality of external interfaces, and the user is connected by the said external interface with the Service-Port module with user port module, server.
3, connection exchanging system as claimed in claim 1 is characterized in that: described server and corresponding with it backup server are followed the backed up in synchronization agreement.
4, a kind of transmission that in connection exchanging system as claimed in claim 1, is used for when server breaks down packet reverse method to the backup server corresponding that continues with this server, it is characterized in that: when described server detection module detects server and breaks down, carry out according to following step:
A, Service-Port module are deleted the record about server;
B, the address transition of revising in the user port module are moved, and transfer packet to main processing block;
C, main processing block send to user side and reply, and simultaneously according to record, use IP address and user port number to send request to backup server, set up TCP and connect, and add the record of this backup server in the Service-Port module;
D, revise address transition action in user port module and the server port module according to the IP address of backup server and port numbers; And number current data packet is carried out the serial number conversion according to the user side data packet delivery serial number of main processing block record and server end data bag pass order.
5, reverse method as claimed in claim 4 is characterized in that: described main processing block sends to reply to user side and is notice user side retransmission data bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011293136A CN1134938C (en) | 2001-06-11 | 2001-06-11 | Connection switching system at front end of server cluster and its switching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011293136A CN1134938C (en) | 2001-06-11 | 2001-06-11 | Connection switching system at front end of server cluster and its switching method |
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| CN1391378A true CN1391378A (en) | 2003-01-15 |
| CN1134938C CN1134938C (en) | 2004-01-14 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423513C (en) * | 2006-03-21 | 2008-10-01 | 杭州华三通信技术有限公司 | Merging method with TCP connection |
| WO2009046646A1 (en) * | 2007-10-09 | 2009-04-16 | Huawei Technologies Co., Ltd. | A method, apparatus and system for performing redundant backup on video service |
| CN1816056B (en) * | 2005-02-02 | 2011-04-06 | 日本电气英富醍株式会社 | Network, network terminal device, method and program for ip address management using same |
| CN101222350B (en) * | 2007-01-12 | 2011-08-24 | 华为技术有限公司 | Protection switching decision method and system |
| CN103944698A (en) * | 2014-04-10 | 2014-07-23 | 四川华雁信息产业股份有限公司 | Hot standby method |
| CN104348637A (en) * | 2013-07-26 | 2015-02-11 | 中国科学院声学研究所 | Method for maintaining TCP connection in fault switching |
| CN106331156A (en) * | 2016-09-26 | 2017-01-11 | 广东小天才科技有限公司 | Terminal information interaction method and device |
| CN109714190A (en) * | 2018-11-28 | 2019-05-03 | 四川商通实业有限公司 | A kind of load balancing based on application level and failure transfer system and its method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192964B (en) * | 2006-11-24 | 2011-04-06 | 中兴通讯股份有限公司 | Master/slave switching system and method for multicast source |
-
2001
- 2001-06-11 CN CNB011293136A patent/CN1134938C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1816056B (en) * | 2005-02-02 | 2011-04-06 | 日本电气英富醍株式会社 | Network, network terminal device, method and program for ip address management using same |
| CN100423513C (en) * | 2006-03-21 | 2008-10-01 | 杭州华三通信技术有限公司 | Merging method with TCP connection |
| CN101222350B (en) * | 2007-01-12 | 2011-08-24 | 华为技术有限公司 | Protection switching decision method and system |
| WO2009046646A1 (en) * | 2007-10-09 | 2009-04-16 | Huawei Technologies Co., Ltd. | A method, apparatus and system for performing redundant backup on video service |
| CN104348637A (en) * | 2013-07-26 | 2015-02-11 | 中国科学院声学研究所 | Method for maintaining TCP connection in fault switching |
| CN103944698A (en) * | 2014-04-10 | 2014-07-23 | 四川华雁信息产业股份有限公司 | Hot standby method |
| CN103944698B (en) * | 2014-04-10 | 2017-10-03 | 四川华雁信息产业股份有限公司 | A kind of double hot standby method |
| CN106331156A (en) * | 2016-09-26 | 2017-01-11 | 广东小天才科技有限公司 | Terminal information interaction method and device |
| CN109714190A (en) * | 2018-11-28 | 2019-05-03 | 四川商通实业有限公司 | A kind of load balancing based on application level and failure transfer system and its method |
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| CN1134938C (en) | 2004-01-14 |
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