CN104378230A - System and method for improving stability of Telnet server - Google Patents
System and method for improving stability of Telnet server Download PDFInfo
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- CN104378230A CN104378230A CN201410618666.3A CN201410618666A CN104378230A CN 104378230 A CN104378230 A CN 104378230A CN 201410618666 A CN201410618666 A CN 201410618666A CN 104378230 A CN104378230 A CN 104378230A
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Abstract
The invention discloses a system for improving the stability of a Telnet server, and a method for improving the stability of the Telnet server through the system. The method includes the steps that when clients put forwards a Telnet connecting request to the server, whether the number U of the clients currently having established Telnet connection with the server is larger than or equal to the preset maximum connecting number Umax of the clients connected to the server is judged; if U<Umax, the clients putting forwards the request establish Telnet connection with the server; if U>=Umax, all the clients connected with the server currently are detected one by one, and connection between the clients which are judged in an abnormal connection state and the server is released. Through the system and method, the clients which have been in the abnormal connection state currently can be effectively detected in time, resources occupied by the abnormal clients are released, and the stability and the safety of the Telnet server are effectively improved.
Description
Technical field
The present invention relates to a kind of system and method improving Telnet service end stability, when specifically referring to that the client's side link quantity received when service end reaches maximum, the abnormal system and method connected is discharged in time, to improve stability and the fail safe of Telnet service end by the mode whether active poll client is online.
Background technology
Telnet is TCP/IP(Transmission Control Protocol/Internet Protocol, transmission control protocol/Internet Protocol) a member in protocol suite is standard agreement and the major way of the service of Internet telnet.It provides the ability completing distance host work on client computers for user, makes client to be connected to service end, and Telnet is one of the most frequently used at present equipment control mode.
When client with service end once set up after Telnet is connected, be not there is data interaction always.If client is normally closed, then the normal release connection of both sides.But when telnet client is a fairly large number of time, often have some client hosts and occur the abnormal conditions such as power down, deadlock, abnormal restarting or communication link disconnection, itself and service end are disconnected; Then because the connection between service end and client is not normal release, service end is not detected, and client is current because of abnormal situation about disconnecting, therefore service end will retain and the session connection of maintenance abnormality client always, long accumulation can cause very many half-open connections and the session process of abnormal client side, cause consumption and the waste of service end resource, affect normally logging in of other client.
The main flow switching equipment product used at present is all used AAA(Authentication, Authorization, Accounting; Certification, mandate, charging) function improves the stability of Telnet service end and fail safe, its specific practice is: 1. limiting maximum client's side link quantity is UMax, if the client that current request connects is UMax+1 user, then service end is busy in the connection of reason refusal with system; 2. the maximum connect hours limiting each client is the general TMax > of TMax(10 minutes), if when the connect hours of active client is more than TMax, service end will disconnect the connection with this client automatically.
But, now general raising Telnet service end stability and the processing mode of fail safe can not effectively solve Problems existing, if disconnect because there being client generation abnormal conditions, service end needs to wait for until after the TMax time, this abnormal client session connected could be removed, releasing resource.And client can cannot realize Telnet with service end because of the number of connection restriction of client to be at any time connected.
Summary of the invention
The object of the present invention is to provide a kind of system and method improving Telnet service end stability, the current client being in abnormal connection status can be detected timely and effectively, and the resource discharged shared by those abnormal client side, effectively improve the stability fail safe of Telnet service end.
In order to achieve the above object, the invention provides a kind of system improving Telnet service end stability, it is arranged in Telnet service end, there is the abnormal client connected for detecting and discharging; This system comprises: counting module, when there being client to propose Telnet connection request to service end, this counting module is for judging whether the current quantity U setting up the client that Telnet is connected with service end is more than or equal to the maximum number of connections amount Umax between service end and client preset; Access module, it is connected with described counting module; As U < Umax, this access module is used for that the client proposing connection request is set up Telnet with service end and is connected; Poller module, it is connected with described counting module; As U >=Umax, this poller module is used for detecting one by one the current all clients be connected with service end, to being judged as the client release connection being in abnormal connection status.
Described poller module comprises: the first message sending module, and it is connected with described counting module, for sending a TCP message to client; First feedback receive module, its answer signal sent after receiving TCP message for receiving client; First release connection module, it is connected with the first described feedback receive module; When this first feedback receive module does not receive the answer signal of client transmission, the Telnet of release between this client with service end is connected by the first described release connection module.
The system of described raising Telnet service end stability, also comprise keep-alive module, it is connected with described counting module; As U≤Umax, this keep-alive module is used for judging whether client is in connection abnormality at set intervals, and this is in the connection between the client of abnormal connection status and service end by release.
Described keep-alive module comprises: the second message sending module, and it is connected with described counting module, for after idle a period of time, sends a keep-alive message, send several times continuously with frequency at set intervals to same client; Second feedback receive module, its answer signal sent after at every turn receiving keep-alive message for receiving this client; Second release connection module, it is connected with the second described feedback receive module; When this second feedback receive module does not receive the answer signal of client transmission all the time, the Telnet of release between this client with service end is connected by the second described release connection module.
Described keep-alive module also comprises parameter setting module; it is connected with the second described message sending module, sends the free time before keep-alive message, this second message sending module often adjacent number of times repeating to send to same client keep-alive message for twice to the time interval between same client transmission keep-alive message and this second message sending module for arranging this second message sending module to a client.
The present invention also provides a kind of method improving Telnet service end stability, specifically comprises following steps:
When there being client to propose Telnet connection request to service end, counting module judges whether the current quantity U setting up the client that Telnet is connected with service end is more than or equal to the maximum number of connections amount Umax between service end and client preset;
If during U < Umax, the client proposing connection request is set up Telnet with service end and is connected by access module;
If during U >=Umax, poller module detects one by one to the current all clients be connected with service end, and to being judged as the client release connection being in abnormal connection status.
Described poller module detects one by one to the current all clients be connected with service end, and to being judged as that the process of the client release connection being in abnormal connection status comprises following steps:
First message sending module sends TCP message to a client;
Whether the first feedback receive module does not receive the answer signal that this client sends after receiving TCP message;
During as do not received answer signal, the client that the first release connection module release is in abnormal connection status is connected with the Telnet between service end;
During as received answer signal, judge whether all to have sent TCP message to detect connection status to all clients be connected with service end; If not, then described first message sending module sends TCP message to other clients.
The method of described raising Telnet service end stability; also comprise: as U < Umax; at interval of a period of time, keep-alive module judges whether client is in connection abnormality, and this is in the connection between the client of abnormal connection status and service end by release.
Described keep-alive module judges whether client is in connection abnormality at set intervals, and the process discharging the connection be between the client of abnormal connection status and service end comprises following steps:
Parameter setting module arranges and sends the free time before keep-alive message to client, arranges and often sends time interval between keep-alive message to same client adjacent twice, and repeat the number of times sending keep-alive message to same client;
Second message sending module at one's leisure between after, send keep-alive message to client, and just repeat at set intervals to send once, send several times continuously;
The whether continuous several times of second feedback receive module all do not receive the answer signal that this client sends;
As continuous several times all do not receive answer signal, the client that the second release connection module release is in abnormal connection status is connected with the Telnet between service end;
As once receive answer signal, judge whether all to have sent keep-alive message to detect connection status to all clients be connected with service end; If not, then described second message sending module sends keep-alive message to other clients.
In sum, the system and method for raising Telnet service end stability provided by the present invention, utilizes TCP keepalive mechanism to realize judging whether client is in connection abnormality at set intervals, and disconnects this client in time with release connection resource; And on this basis, the quantity of the client connected when service end reaches in limited time, realize the connection status of the initiatively all clients of poll, judge whether have current being in connect abnormal client existence at once, thus the connection resource discharged as early as possible shared by those clients, use to be supplied to other clients asking to connect.
Therefore, the system and method for raising Telnet service end stability provided by the present invention, the current client being in abnormal connection status can be detected timely and effectively, and the resource discharged shared by those abnormal client side, thus provide better service for client, make the code structure of Telnet service end more succinct and healthy and strong simultaneously, effectively improve the stability fail safe of Telnet service end.
Accompanying drawing explanation
Fig. 1 is the structural representation of the system of raising Telnet service end stability provided by the invention;
Fig. 2 is the method flow diagram of raising Telnet service end stability provided by the invention;
Fig. 3 is whether the poll client in the present invention connects abnormal method flow diagram.
Embodiment
Below in conjunction with Fig. 1 ~ Fig. 3, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in Figure 1, be the system of raising Telnet service end stability provided by the present invention, it is arranged in Telnet service end, there is the abnormal client connected for detecting and discharging; This system comprises:
Counting module 1, when there being client to propose Telnet connection request to service end, this counting module 1 is for judging whether the current quantity U setting up the client that Telnet is connected with service end is more than or equal to the maximum number of connections amount Umax between service end and client preset;
Access module 2, it is connected with described counting module 1; As U < Umax, this access module 2 is connected for the client proposing connection request is set up Telnet with service end;
Poller module 3, it is connected with described counting module 1; As U >=Umax, this poller module 3 for detecting one by one the current all clients be connected with service end, to being judged as the client release connection being in abnormal connection status.
Described poller module 3 comprises: the first message sending module 31, and it is connected with described counting module 1, for sending a TCP message to client; First feedback receive module 32, its answer signal sent after receiving TCP message for receiving client; First release connection module 33, it is connected with the first described feedback receive module 32; When this first feedback receive module 32 does not receive the answer signal of client transmission, show that this client is in abnormal connection status, the Telnet of release between this client with service end is connected by the first described release connection module 33, thus reaches releasing resource to be supplied to the object that other are asking the client connected.
The system of described raising Telnet service end stability, can also comprise keep-alive (KeepAlive) module 4, it is connected with described counting module 1; As U < Umax, this keep-alive module 4 is for judging whether client is in connection abnormality at set intervals, and this is in the connection between the client of abnormal connection status and service end by release.
In specific embodiment, described keep-alive module 4 can comprise: the second message sending module 41, and it is connected with described counting module 1, for after idle a period of time, send a KeepAlive message with frequency at set intervals to same client, send several times continuously; Second feedback receive module 42, its answer signal sent after at every turn receiving KeepAlive message for receiving this client; Second release connection module 43, it is connected with the second described feedback receive module 42; When this second feedback receive module 42 does not receive the answer signal of client transmission all the time, show that this client is in abnormal connection status, the Telnet of release between this client with service end is connected by the second described release connection module 43.
Further; described keep-alive module 4 can also comprise parameter setting module 44; it is connected with the second described message sending module 41; the free time T1 before KeepAlive message is sent to a client for arranging this second message sending module 41; this the second message sending module 41 often sends time interval T2 between KeepAlive message to same client adjacent twice, and this second message sending module 41 repeats the times N sending KeepAlive message to same client.
As shown in Figure 2, the present invention also provides a kind of method improving Telnet service end stability, and it adopts the above-mentioned system be arranged in Telnet service end to realize, and the method specifically comprises following steps:
S0, client propose Telnet connection request to service end;
S1, counting module 1 judge whether the current quantity U setting up the client that Telnet is connected with service end is greater than the maximum number of connections amount Umax between service end and client preset;
If during U < Umax, perform step S2: the client proposing connection request is set up Telnet with service end and is connected by access module 2;
If during U >=Umax, continue to perform step S3: poller module 3 detects one by one to the current all clients be connected with service end, to being judged as the client release connection being in abnormal connection status.
As shown in Figure 3, described step S3 comprises following steps:
S31, the first message sending module 31 send TCP message to a client;
Whether S32, the first feedback receive module 32 do not receive the answer signal that this client sends after receiving TCP message;
As do not received answer signal, show that this client is in abnormal connection status, the client that the release of continuation execution step S33: the first release connection module 33 is in abnormal connection status is connected with the Telnet between service end, thus reaches releasing resource to be supplied to the object that other are asking the client connected;
As received answer signal, showing that this client is in normal connection status, continuing to perform step S34: judge whether all to have sent TCP message to detect connection status to all clients be connected with service end; If so, then terminate; If not, then return continuation and perform step S31.
As shown in Figure 2; the method of described raising Telnet service end stability; can also comprise after step S1: step S4, as U < Umax; utilize TCP keepalive mechanism; keep-alive module 4 judges whether client is in connection abnormality at set intervals, and this is in the connection between the client of abnormal connection status and service end by release.Described step S4 and step S2 can perform simultaneously.
Described step S4 comprises following steps:
S40, parameter setting module 44 arrange and send the free time T1 before KeepAlive message to a client, arrange and often send time interval T2 between KeepAlive message to same client adjacent twice, and repeat the times N sending KeepAlive message to same client; In the present embodiment, described T1 can be set to 5 minutes; Described T2 can be set to 75 seconds; Described N is set to 10 times;
S41, the second message sending module 41, after the idle T1 time, send KeepAlive message to a client, and T2 just repeats to send once at set intervals, sends N time continuously;
Whether S42, the second feedback receive module 42 N continuous time all do not receive the answer signal that this client sends;
As N continuous time does not all receive answer signal, show that this client is in abnormal connection status, the client that the release of continuation execution step S43: the second release connection module 43 is in abnormal connection status is connected with the Telnet between service end;
As once receive answer signal, show that this client is in normal connection status, continue to perform step S44: judge whether all to have sent KeepAlive message to detect connection status to all clients be connected with service end; If so, then terminate; If not, then return continuation and perform step S41.
In sum, the system and method for raising Telnet service end stability provided by the present invention, utilizes TCP keepalive mechanism to realize judging whether client is in connection abnormality at set intervals, and disconnects this client in time with release connection resource; And on this basis, the quantity of the client connected when service end reaches in limited time, realize the connection status of the initiatively all clients of poll, judge whether have current being in connect abnormal client existence at once, thus the connection resource discharged as early as possible shared by those clients, use to be supplied to other clients asking to connect.
Therefore, the system and method for raising Telnet service end stability provided by the present invention, the current client being in abnormal connection status can be detected timely and effectively, and the resource discharged shared by those abnormal client side, thus provide better service for client, make the code structure of Telnet service end more succinct and healthy and strong simultaneously, effectively improve the stability fail safe of Telnet service end.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. improve a system for Telnet service end stability, be arranged in Telnet service end, there is the abnormal client connected for detecting and discharging; It is characterized in that, this system comprises:
Counting module (1), when there being client to propose Telnet connection request to service end, this counting module (1) is for judging whether the current quantity U setting up the client that Telnet is connected with service end is more than or equal to the maximum number of connections amount Umax between service end and client preset;
Access module (2), it is connected with described counting module (1); As U < Umax, this access module (2) is connected for the client proposing connection request is set up Telnet with service end;
Poller module (3), it is connected with described counting module (1); As U >=Umax, this poller module (3) for detecting one by one the current all clients be connected with service end, to being judged as the client release connection being in abnormal connection status.
2. the system improving Telnet service end stability as claimed in claim 1, it is characterized in that, described poller module (3) comprises:
First message sending module (31), it is connected with described counting module (1), for sending a TCP message to client;
First feedback receive module (32), its answer signal sent after receiving TCP message for receiving client;
First release connection module (33), it is connected with described the first feedback receive module (32); When this first feedback receive module (32) does not receive the answer signal of client transmission, the Telnet of release between this client with service end is connected by the first described release connection module (33).
3. the system improving Telnet service end stability as claimed in claim 1, it is characterized in that, also comprise keep-alive module (4), it is connected with described counting module (1); As U < Umax, this keep-alive module (4) is for judging whether client is in connection abnormality at set intervals, and this is in the connection between the client of abnormal connection status and service end by release.
4. the system improving Telnet service end stability as claimed in claim 3, it is characterized in that, described keep-alive module (4) comprises:
Second message sending module (41), it is connected with described counting module (1), for after idle a period of time, sends a keep-alive message, send several times continuously with frequency at set intervals to same client;
Second feedback receive module (42), its answer signal sent after at every turn receiving keep-alive message for receiving this client;
Second release connection module (43), it is connected with described the second feedback receive module (42); When this second feedback receive module (42) does not receive the answer signal of client transmission all the time, the Telnet of release between this client with service end is connected by the second described release connection module (43).
5. the system improving Telnet service end stability as claimed in claim 4, it is characterized in that, described keep-alive module (4) also comprises parameter setting module (44), and it is connected with the second described message sending module (41); The free time before keep-alive message, this second message sending module (41) often adjacent number of times repeating to send to same client keep-alive message for twice to the time interval between same client transmission keep-alive message and this second message sending module (41) is sent to a client for arranging the second described message sending module (41).
6. improve a method for Telnet service end stability, it is characterized in that, the method comprises following steps:
When there being client to propose Telnet connection request to service end, counting module (1) judges whether the current quantity U setting up the client that Telnet is connected with service end is more than or equal to the maximum number of connections amount Umax between service end and client preset;
If during U < Umax, the client proposing connection request is set up Telnet with service end and is connected by access module (2);
If during U >=Umax, poller module (3) detects one by one to the current all clients be connected with service end, and to being judged as the client release connection being in abnormal connection status.
7. the method improving Telnet service end stability as claimed in claim 6, it is characterized in that, described poller module (3) detects one by one to the current all clients be connected with service end, and to being judged as that the process of the client release connection being in abnormal connection status comprises following steps:
First message sending module (31) sends TCP message to a client;
Whether the first feedback receive module (32) does not receive the answer signal that this client sends after receiving TCP message;
During as do not received answer signal, the client that the first release connection module (33) release is in abnormal connection status is connected with the Telnet between service end;
During as received answer signal, judge whether all to have sent TCP message to detect connection status to all clients be connected with service end; If not, then described first message sending module (31) sends TCP message to other clients.
8. the method improving Telnet service end stability as claimed in claim 6; it is characterized in that; also comprise: as U < Umax; keep-alive module (4) judges whether client is in connection abnormality at set intervals, and discharges the connection be between the client of abnormal connection status and service end.
9. the method improving Telnet service end stability as claimed in claim 8; it is characterized in that; described keep-alive module (4) judges whether client is in connection abnormality at set intervals, and the process discharging the connection be between the client of abnormal connection status and service end comprises following steps:
Parameter setting module (44) arranges and sends the free time before keep-alive message to client, arranges and often sends time interval between keep-alive message to same client adjacent twice, and repeat the number of times sending keep-alive message to same client;
Second message sending module (41) at one's leisure between after, send keep-alive message to client, and just repeat to send once at interval of a period of time, send several times continuously;
The whether continuous several times of second feedback receive module (42) all do not receive the answer signal that this client sends;
As continuous several times all do not receive answer signal, the client that the second release connection module (43) release is in abnormal connection status is connected with the Telnet between service end;
As once receive answer signal, judge whether all to have sent keep-alive message to detect connection status to all clients be connected with service end; If not, then described second message sending module (41) sends keep-alive message to other clients.
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| CN201410618666.3A CN104378230A (en) | 2014-11-06 | 2014-11-06 | System and method for improving stability of Telnet server |
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| CN201410618666.3A CN104378230A (en) | 2014-11-06 | 2014-11-06 | System and method for improving stability of Telnet server |
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Application publication date: 20150225 |