CN103607356A - Load balancing method, load balancer and system thereof - Google Patents
Load balancing method, load balancer and system thereof Download PDFInfo
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- CN103607356A CN103607356A CN201310566155.7A CN201310566155A CN103607356A CN 103607356 A CN103607356 A CN 103607356A CN 201310566155 A CN201310566155 A CN 201310566155A CN 103607356 A CN103607356 A CN 103607356A
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Abstract
The invention discloses a load balancing method, a load balancer and a system thereof. The method comprises: when a request form a client is received, a session Id is obtained from the request; and a server corresponding to the session Id is searched in a session list and the request is sent to the server, wherein a server address corresponding to the session Id is preserved in the session list. According to the technical scheme, the session Id is obtained in the request from the client and the corresponding server is determined by using the session Id, thereby ensuring that no interruption occurs during the session process. Moreover, load balancing is realized; and thus problems that session may be lost or the load is not balanced in the prior art can be solved and the beneficial effect of load balancing realization on the premise of session keeping is realized.
Description
Technical field
The present invention relates to field of computer technology, be specifically related to a kind of load-balancing method, load equalizer and system.
Background technology
After Clustering is released, load balancing gets the attention research as the core of Clustering, load balancing should guarantee that the load between back-end server is suitable, in the scene that needs session to keep, need again correctly the request of same session to be assigned to corresponding back-end server, guarantee that the session between client and back-end server is not lost.
LVS(Linux Virtual Server, Linux virtual server) be the load-balancing technique of increasing income, by at Netfilter(netfilter) test point (HOOK) point on insert call method, at IP(Internet Protocol, the agreement interconnecting between network) layer is realized the transparent forwarding of packet.LVS safeguards a connection table information, preserves client ip, port and back-end server IP and port information, when having packet to arrive, according to IP, port information inquiry connection table, obtains forwarding target.
LVS utilizes source IP to carry out session maintenance at present, in the packet of arrival LVS, the data of identical sources IP are assigned to same back-end server without exception, as TCP(Transmission Control Protocol, transmission control protocol) SYN(is synchronous) wrap while arriving LVS, LVS can inquire about in connection table, whether there is the consistent connection of SYN bag source IP therewith, if existed, SYN bag is forwarded to the back-end server of linkage record, if there is no by forwarding after a back-end server of dispatching algorithm scheduling of configuration.
The shortcoming of such scheme is under high speed proxy surfing environment, to have session loss and serious load imbalance problem, Fig. 1 shows the session flow process under multi-proxy server online environment, a large amount of client users' request, by the ISP(Internet Service Provider of many proxy servers, ISP) or intranet send to load equalizer to connect, from two requests of same client's same session, may walk different proxy servers and arrive LVS(load equalizer), source IP is different in LVS judgement, two requests are assigned to different back-end server devices, cause session loss, such as, LVS, by the access request from Proxy1, according to the IP address of proxy server 1, utilizes load-balancing algorithm to select Fig. 1 the top one station server to process, and by the access request from Proxy2, according to the IP address of proxy server 2, utilize load-balancing algorithm to select the bottom station server of Fig. 1 to process, cause session loss.Fig. 2 shows the session flow process under single proxy server online environment, the request of a large amount of clients arrives LVS by single proxy server, and source IP is identical in LVS judgement, and these requests are all assigned to same back-end server, cause separate unit server overload, other servers are but very idle.Such as, access request from three clients all arrives LVS, and LVS judgement is all the access request (source IP is identical) from Proxy1, and load equalizer keeps all connections to be all transmitted to a station server according to session, the load imbalance that like this, just causes server.
Summary of the invention
In view of the above problems, the present invention has been proposed to a kind of overcome the problems referred to above or the load equalizer addressing the above problem at least in part, system and corresponding load-balancing method are provided.
According to one aspect of the present invention, a kind of load-balancing method is provided, for realize load balancing between server, the method comprises:
When receiving the request of client, from described request, obtain session identity card SessionId;
From session Session table, search the server corresponding with described SessionId, described request is sent to this server; Wherein, in described Session table, preserve the server address corresponding with SessionId.
Alternatively, in the small-size text file cookie information of described SessionId from described request, obtain;
Before described request is sent to this server, utilize synchronous SYN bag, the confirmation ACK bag of buffer memory in advance to connect with this server.
Alternatively, when not finding the server corresponding with described SessionId from described Session table, according to load balancing principle, select a station server, utilize described buffer memory SYN bag, ACK bag to connect with this server, described request is sent to this server.
Alternatively, receive after the response data packet of server, when described response data packet comprise SessionId time; The address of described SessionId and this server is saved in Session table;
According to link information, described response data packet is transmitted to client.
Alternatively, while not comprising SessionId in described response data packet, according to link information, described response data packet is transmitted to client.
According to a further aspect in the invention, provide a kind of load equalizer, for realize load balancing between server, this load equalizer comprises:
Client identity acquisition of information module for when receiving the request of client, is obtained session identity card SessionId from described request;
Sending module, for searching the server corresponding with described SessionId from session Session table, sends to this server by described request; Wherein, in described Session table, preserve the server address corresponding with SessionId.
Alternatively, in the small-size text file cookie information of described client identity acquisition of information module from described request, obtain described SessionId;
Before described sending module sends to this server by described request, utilize synchronous SYN bag, the confirmation ACK bag of buffer memory in advance to connect with this server.
Alternatively, described sending module also for:
When described client identity acquisition of information module is not found the server corresponding with described SessionId from described Session table, described sending module is according to load balancing principle, select a station server, utilize described buffer memory SYN bag, ACK bag to connect with this server, described request is sent to this server.
Alternatively, described device also comprises:
Conversational list update module, for receiving after the response data packet of server, when described response data packet comprises SessionId; The address of described SessionId and this server is saved in Session table;
Described sending module, according to link information, is transmitted to client by described response data packet.
Alternatively, described sending module also for:
While not comprising SessionId in described response data packet, according to link information, described response data packet is transmitted to client.
According to a further aspect in the invention, provide a kind of load equalizer system, comprised a plurality of clients, multiple servers, and be arranged on the described load equalizer between client, server.
Technical scheme of the present invention is by obtaining SessionId the request from client, utilize SessionId to determine corresponding server, can guarantee whether conversation procedure interrupts, and, realize load balancing, solved thus that in prior art, exist may session loss and the problem of load imbalance, obtained guarantee to realize under the prerequisite that session keeps load balancing beneficial effect.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 shows the structure chart being connected with Duo Tai proxy server by load equalizer between client in prior art, server;
Fig. 2 shows the structure chart being connected with separate unit proxy server by load equalizer between client in prior art, server;
Fig. 3 shows a kind of flow chart of load-balancing method according to an embodiment of the invention;
Fig. 4 shows and a kind ofly according to an embodiment of the invention for client requests, carries out process chart;
Fig. 5 shows a kind of according to an embodiment of the invention process chart for server response;
Fig. 6 shows a kind of structural representation of load equalizer according to an embodiment of the invention;
Fig. 7 shows the structural representation of a kind of load equalizer of another embodiment according to the present invention.
Embodiment
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown exemplary embodiment of the present disclosure in accompanying drawing, yet should be appreciated that and can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order more thoroughly to understand the disclosure that these embodiment are provided, and can by the scope of the present disclosure complete convey to those skilled in the art.
As shown in Figure 3, the embodiment of the present invention relates to a kind of load-balancing method, and for realize load balancing between server, the method comprises: when receiving the request of client, obtain session identity card SessionId from this request; From session Session table, search the server corresponding with SessionId, above-mentioned request is sent to this server; Wherein, in Session table, preserve the server address corresponding with SessionId.
Concrete, when having new request to arrive LVS, utilize the cookie information of delayed binding technology in ask, then according to the SessionID field selection back-end server in cookie information, forward.In whole process, added sl_vs_request_skbuff data volume, be used for preserving SYN bag, ACK bag and request header packet, and record load equalizer and send back to the packet TCP homing sequence number of client and the TCP homing sequence number that real server produces.
Sl_vs_request_skbuff is mainly used for, and preserves SYN bag, ACK bag and request header packet, and example is as follows:
struct?sl_vs_request_skbuff
{
struct?list_head?r_list;
u16af;/*address?family*/
union?nf_inet_addr?caddr;
union?nf_inet_addr?vaddr;
__be16cport;
__be16vport;
_ _ u16protocol; //tcp agreement, can consider not this field
/*counter?and?timer*/
atomic_t?refcnt;/*reference?count*/
struct?timer_list?timer;/*Expiration?timer*/
volatile?unsigned?long?timeout;/*timeout*/
/*Flags?and?state?transition*/
spinlock_t?lock;/*lock?for?state?transition*/
volatile__u16flags;/*status?flags*/
volatile__u16state;/*state?info*/
Atomic_t req_pkt_draf_flag; The subpackage of/* request header is 1, otherwise be 0*/
Struct sl_vs_session*session; In/* LB, exist session for binding, otherwise be NULL*/
struct?sk_buff*syn_buff;
struct?sk_buff*ack_buff;
Struct sk_buff_head request_buff; // may be a plurality of packets, request header buffer memory
// preservation sequence number
volatile__u32vseq;
volatile__u32dseq;
};
LVS is in NetFilter(packet filtering) on registered the client-requested that two important function ip_vs_in(are responsible for load equalizer to receive and processed) and the ip_vs_out(server of being responsible for that load equalizer is received respond process), process respectively the packet of Client → Server direction and Server → Client direction.Fig. 4 is ip_vs_in process chart, and Fig. 5 is ip_vs_out process chart.
As shown in Figure 4, when receiving client-requested, comprise following treatment step:
When the request of client transmission arrives, on load equalizer, simulate TCP and connect process of establishing, the process that emulating server and client connect, and buffer memory SYN bag, ACK bag and request header.
From request header, take out SessionId.
Search the Session table of setting up in advance, judge in Session table whether include above-mentioned SessionId.
If include above-mentioned SessionId in Session table, show that client and server have carried out session, therefore, the server address corresponding with above-mentioned SessionId carrying according to Session souvenir, selects this server to connect; Utilize SYN bag, the ACK bag of buffer memory to be connected with selected server, then request header is sent to this server.
If do not include above-mentioned SessionId in Session table, show it is to initiate for the first time to connect, there is no session information, therefore, based on load-balancing algorithm, select a station server, with SYN bag, the ACK bag of aforementioned buffer memory, after modifying target address and port, be connected with selecteed server, request header is sent to this server.
As shown in Figure 5, after the complete request of server process, feedback server response data packet, specifically comprises:
Load equalizer is received after the response data packet of server feedback, resolution response packet, take out in request header can this time session of unique identification SessionId;
Judge whether this SessionId is empty, if so, shows to have session information to exist, load equalizer utilizes SYN bag, the ACK bag of buffer memory, after modifying target address, port and sequence number, issues client.If not, show also not record this session information in Session table, therefore, SessionId and corresponding server address are inserted in Session table as a record, then utilize SYN bag, the ACK bag of buffer memory, after modifying target address, port and sequence number, issue client.
Like this, session each time will be set up record, and then in subsequent request, can be found corresponding server according to SessionId when session establishment in Session table, can not cause session loss; And for the request of initiating for the first time to connect, can utilize load-balancing algorithm to carry out server-assignment, can not cause load imbalance.
As shown in Figure 6, the embodiment of the present invention also relates to a kind of load equalizer of realizing said method, and for realize load balancing between server, this load equalizer comprises:
Client identity acquisition of information module for when receiving the request of client, is obtained session identity card SessionId from described request;
Sending module, for searching the server corresponding with described SessionId from session Session table, sends to this server by described request; Wherein, in described Session table, preserve the server address corresponding with SessionId.
Wherein, in the small-size text file cookie information of described client identity acquisition of information module from described request, obtain described SessionId;
Before described sending module sends to this server by described request, utilize synchronous SYN bag, the confirmation ACK bag of buffer memory in advance to connect with this server.
Described sending module also for:
When described client identity acquisition of information module is not found the server corresponding with described SessionId from described Session table, described sending module is according to load balancing principle, select a station server, utilize described buffer memory SYN bag, ACK bag to connect with this server, described request is sent to this server.
As shown in Figure 7, this device also comprises:
Conversational list update module, for receiving after the response data packet of server, when described response data packet comprises SessionId; The address of described SessionId and this server is saved in Session table;
Described sending module, according to link information, is transmitted to client by described response data packet.
Wherein, described sending module also for:
While not comprising SessionId in described response data packet, according to link information, described response data packet is transmitted to client.
In addition, the embodiment of the present invention also relates to a kind of load equalizer system, comprises a plurality of clients, multiple servers, and be arranged on the load equalizer between client, server, wherein, load equalizer is the load equalizer described in above-described embodiment, and the present embodiment is not describing in detail.
Technical scheme of the present invention is by obtaining SessionId the request from client, utilize SessionId to determine corresponding server, can guarantee that reply process interrupts, and, realize load balancing, solved thus that in prior art, existing to reply and lost and the problem of load imbalance, obtained under the prerequisite that guarantees reply maintenance, realize load balancing beneficial effect.
The algorithm providing at this is intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment with demonstration.Various general-purpose systems also can with based on using together with this teaching.According to description above, it is apparent constructing the desired structure of this type systematic.In addition, the present invention is not also for any certain programmed language.It should be understood that and can utilize various programming languages to realize content of the present invention described here, and the description of above language-specific being done is in order to disclose preferred forms of the present invention.
In the specification that provided herein, a large amount of details have been described.Yet, can understand, embodiments of the invention can not put into practice in the situation that there is no these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the above in the description of exemplary embodiment of the present invention, each feature of the present invention is grouped together into single embodiment, figure or sometimes in its description.Yet, the method for the disclosure should be construed to the following intention of reflection: the present invention for required protection requires than the more feature of feature of clearly recording in each claim.Or rather, as reflected in claims below, inventive aspect is to be less than all features of disclosed single embodiment above.Therefore, claims of following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can the module in the equipment in embodiment are adaptively changed and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and can put them into a plurality of submodules or subelement or sub-component in addition.At least some in such feature and/or process or unit are mutually repelling, and can adopt any combination to combine all processes or the unit of disclosed all features in this specification (comprising claim, summary and the accompanying drawing followed) and disclosed any method like this or equipment.Unless clearly statement in addition, in this specification (comprising claim, summary and the accompanying drawing followed) disclosed each feature can be by providing identical, be equal to or the alternative features of similar object replaces.
In addition, those skilled in the art can understand, although embodiment more described herein comprise some feature rather than further feature included in other embodiment, the combination of the feature of different embodiment means within scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with compound mode arbitrarily.
All parts embodiment of the present invention can realize with hardware, or realizes with the software module moved on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that and can use in practice microprocessor or digital signal processor (DSP) to realize the some or all functions according to the some or all parts in the load equalizer of the embodiment of the present invention.The present invention for example can also be embodied as, for carrying out part or all equipment or device program (, computer program and computer program) of method as described herein.Realizing program of the present invention and can be stored on computer-readable medium like this, or can there is the form of one or more signal.Such signal can be downloaded and obtain from internet website, or provides on carrier signal, or provides with any other form.
It should be noted above-described embodiment the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment in the situation that do not depart from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and is not listed as element or step in the claims.Being positioned at word " " before element or " one " does not get rid of and has a plurality of such elements.The present invention can be by means of including the hardware of some different elements and realizing by means of the computer of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to carry out imbody by same hardware branch.The use of word first, second and C grade does not represent any order.Can be title by these word explanations.
Claims (11)
1. a load-balancing method, for realize load balancing between server, the method comprises:
When receiving the request of client, from described request, obtain session identity card SessionId;
From session Session table, search the server corresponding with described SessionId, described request is sent to this server; Wherein, in described Session table, preserve the server address corresponding with SessionId.
2. the method for claim 1, wherein
In the small-size text file cookie information of described SessionId from described request, obtain;
Before described request is sent to this server, utilize synchronous SYN bag, the confirmation ACK bag of buffer memory in advance to connect with this server.
3. method as claimed in claim 2, wherein,
When not finding the server corresponding with described SessionId from described Session table, according to load balancing principle, select a station server, utilize described buffer memory SYN bag, ACK bag to connect with this server, described request is sent to this server.
4. the method as described in claim 1～3 any one, wherein,
Receive after the response data packet of server, when described response data packet comprise SessionId time; The address of described SessionId and this server is saved in Session table;
According to link information, described response data packet is transmitted to client.
5. method as claimed in claim 4, wherein,
While not comprising SessionId in described response data packet, according to link information, described response data packet is transmitted to client.
6. a load equalizer, for realize load balancing between server, this load equalizer comprises:
Client identity acquisition of information module for when receiving the request of client, is obtained session identity card SessionId from described request;
Sending module, for searching the server corresponding with described SessionId from session Session table, sends to this server by described request; Wherein, in described Session table, preserve the server address corresponding with SessionId.
7. load equalizer as claimed in claim 6, wherein, obtains described SessionId in the small-size text file cookie information of described client identity acquisition of information module from described request;
Before described sending module sends to this server by described request, utilize synchronous SYN bag, the confirmation ACK bag of buffer memory in advance to connect with this server.
8. load equalizer as claimed in claim 7, wherein, described sending module also for:
When described client identity acquisition of information module is not found the server corresponding with described SessionId from described Session table, described sending module is according to load balancing principle, select a station server, utilize described buffer memory SYN bag, ACK bag to connect with this server, described request is sent to this server.
9. the load equalizer as described in claim 6～8 any one, wherein, described device also comprises:
Conversational list update module, for receiving after the response data packet of server, when described response data packet comprises SessionId; The address of described SessionId and this server is saved in Session table;
Described sending module, according to link information, is transmitted to client by described response data packet.
10. load equalizer as claimed in claim 9, wherein, described sending module also for:
While not comprising SessionId in described response data packet, according to link information, described response data packet is transmitted to client.
11. 1 kinds of load equalizer systems, comprise a plurality of clients, multiple servers, and are arranged on the load equalizer between client, server, and wherein, described load equalizer is the load equalizer described in claim 6～10 any one.
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| CN105100101A (en) * | 2015-07-31 | 2015-11-25 | 新浪网技术(中国)有限公司 | Method, apparatus and system based on SSL session |
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| CN109246222A (en) * | 2018-09-21 | 2019-01-18 | 郑州云海信息技术有限公司 | service request processing method, device, system and computer readable storage medium |
| CN111741039A (en) * | 2019-03-25 | 2020-10-02 | 阿里巴巴集团控股有限公司 | Session request processing method and device and electronic equipment |
| CN111741039B (en) * | 2019-03-25 | 2022-06-03 | 阿里巴巴集团控股有限公司 | Session request processing method and device and electronic equipment |
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| CN110086886B (en) * | 2019-05-14 | 2021-12-31 | 北京天融信网络安全技术有限公司 | Dynamic session holding method and device |
| CN111030999A (en) * | 2019-11-15 | 2020-04-17 | 广州辰河质检技术有限公司 | Method for extracting files based on network data packet |
| CN111030999B (en) * | 2019-11-15 | 2021-09-24 | 广州辰河质检技术有限公司 | Method for extracting files based on network data packet |
| CN110913039A (en) * | 2019-12-03 | 2020-03-24 | 杭州圆石网络安全技术有限公司 | TCP stream drift processing method and device with separated data and control |
| CN113242272A (en) * | 2021-03-24 | 2021-08-10 | 中国雄安集团数字城市科技有限公司 | MQTT service cluster-based session processing method and system |
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