CN103491123A - Load balancing method based on domain name visiting, system and load balancer - Google Patents
Load balancing method based on domain name visiting, system and load balancer Download PDFInfo
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Abstract
The invention discloses a load balancing method based on domain name visiting, a system and a load balancer. The method includes the steps that a service request of a user is received, and virtual service in the service request is analyzed; a background server group corresponding to the virtual service is looked up according to a corresponding relation between preset virtual service and the background server group; a background server is selected from the background server group, an IP address corresponding to a domain name is looked up from a domain name server according to the domain name of the background server, and the service request is sent to a corresponding background server according to the IP address. When a manager modifies the IP address of the background server, the manager does not need to modify a configuration file in the load balancer, the load lancer can still look up the corresponding background server according to the domain name, and access to service by the user cannot be influenced. Besides, as for a manager for the server, configuration work for defining the background server by means of the domain name in the load balancer is quite simple.
Description
Technical field
The present invention relates to the IP technical field, relate in particular to a kind of load-balancing method, system and load equalizer based on domain name access.
Background technology
Load balancing is that load (task) is shared evenly on a plurality of operating units and carried out, such as Web server, ftp server, the crucial application server of enterprise and other mission critical server etc., thus jointly finish the work task.
Load-balancing technique has mainly been applied: DNS load balancing, proxy server load balance, address conversion gateway load balancing, agreement internal support load balancing, NAT load balancing NAT, reverse proxy load balancing, mixed type load balancing etc.
Domain name system (Domain Name System, DNS), be comprised of resolver and name server.Name server refers to domain name and the corresponding IP address of preserving All hosts in this network, and has the server that domain name is converted to the IP address function.Wherein domain name must not necessarily have domain name in ，ErIP address, a corresponding IP address.Domain name system adopts the hierarchical organization of similar directory tree.Name server is the server side in Client/Server pattern, and it mainly contains two kinds of forms: master server and forwarding server.The process that domain name is mapped as to the IP address just is called " domain name mapping ".On Internet, between domain name and IP address, be (or many-one) one to one, also can adopt the DNS repeating query to realize one-to-many, although domain name is convenient to people's memory, but only recognize the IP address between machine, conversion work between them is called domain name mapping, domain name mapping need to be completed by special domain name resolution server, and DNS is exactly the server that carries out domain name mapping.The DNS name is for TCP/IP networks such as Internet, by user-friendly name lookup computer and service.When inputting dns name as the user claiming in application program, the DNS service can be other associated information by this name resolving, as the IP address.Because when online, the network address of input, be to resolve and found corresponding IP address by domain name analysis system, could surf the Net like this.In fact, the final sensing of domain name is IP.
Present load balancing, be all that the IP/TCP for server carries out load balancing, in configuration load equalization algorithm on load equalizer, all will at first define background server, is all to define background server with the combination of IP and TCP now.Therefore, in the IP of background server address change back loading equalizer, IP address corresponding to background server also needs corresponding change, otherwise the user can't access this business; And prior art, be configured very complicatedly to background server, cause the waste of resource allocation to a certain degree.
Summary of the invention
Change in order to solve service IP address in prior art the technical problem that rear user can't access, save resource allocation; The present invention proposes a kind of load-balancing method, system and load equalizer based on domain name access.
One aspect of the present invention, provide a kind of load-balancing method based on domain name access, utilizes domain name to set background server, and the method comprises:
Receive user's service request, and resolve the Virtual Service in described service request;
According to the corresponding relation of predefined Virtual Service and background server group, search background server group corresponding to described Virtual Service;
Select background server from described background server group, according to the domain name of described background server, inquire about the IP address that domain name is corresponding from name server, according to described IP address, described service request is sent to corresponding background server.
Another aspect of the present invention, provide a kind of SiteServer LBS based on domain name access, comprising: name server and the load equalizer that utilizes domain name setting background server,
The domain name server, for the domain name of storing virtual service and the corresponding relation of IP address;
Described load equalizer, for receiving user's service request, and resolve the Virtual Service in described service request; According to the corresponding relation of predefined Virtual Service and background server group, search background server group corresponding to described Virtual Service; Select background server from described background server group, according to the domain name of described background server, inquire about the IP address that domain name is corresponding from the domain name server, according to described IP address, described service request is sent to corresponding background server.
Another aspect of the present invention, provide a kind of load equalizer, utilizes domain name to set background server, and described load equalizer comprises:
Receiver module, for receiving user's service request;
Parsing module, for resolving the Virtual Service of described service request;
Memory module, for storing the corresponding relation of predefined described Virtual Service and background server group;
Search module, for the corresponding relation according to described Virtual Service and background server group, search background server group corresponding to described Virtual Service;
Select module, for from described background server group, selecting background server;
Enquiry module, inquire about IP address corresponding to domain name for the domain name according to described background server from name server;
Sending module, inquire about IP address corresponding to domain name for the domain name according to described background server from the domain name server.
Load-balancing method, system and load equalizer based on domain name access of the present invention, on load equalizer, utilize domain name to set background server, when forwarding user's access request, IP address corresponding to domain name to name server inquiry background server, be forwarded to background server according to the IP address by access request.Because background server is defined by domain name, when the IP address that administrative staff have revised background server, administrative staff are without the configuration file of revising in load equalizer, and load equalizer still can, according to domain name lookup to corresponding background server, can not have influence on the access of user to business.And, adopt domain name definition background server in load equalizer, can greatly reduce the resource allocation of station server, raise the efficiency.
The accompanying drawing explanation
Fig. 1 is the structure chart that the present invention is based on the SiteServer LBS embodiment of domain name access;
Fig. 2 is the structure chart of load equalizer embodiment of the present invention;
Fig. 3 is the flow chart that the present invention is based on the load-balancing method embodiment of domain name access.
Embodiment
Present load balancing, be all that the IP/TCP for server carries out load balancing, in configuration load equalization algorithm on load equalizer, all will at first define background server, is all to define background server with the combination of IP and TCP now.In actual production, also service application expansion of development along with the Internet, the inventor finds, if background server is the server be placed on Internet, define background server based on IP following defect will be arranged: in whole system, background server is that the IP address corresponding to business of carrying out with it defines, if administrative staff have revised the IP address of background server, and do not revise in load equalizer the IP address that background server is corresponding thereupon, the user is behind input IP address so, system can't find background server corresponding to this business, the user can't access this business.
Another inventor finds, for the administrative staff of background server, background server is configured very complicated, at first will find IP address corresponding to business with the order of ping+IP address on computers, and this IP address configuration is become to background server; Then configuration packet is containing the group of this background server; Last configuration access strategy, while comprising path corresponding to IP address in the URL of user access request, just choose this group, and then selected this background server.
Change in order to solve service IP address in prior art the technical problem that rear user can't access, the present invention proposes a kind of load-balancing method, system and load equalizer based on domain name access; When simultaneously the present invention has also solved Traditional IP/TCP and carries out load balancing, need carry out the technical problem that complex configurations causes the resource allocation waste to background server.
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, the SiteServer LBS embodiment that the present invention is based on domain name access comprises: utilize domain name set the load equalizer 11 of background server, a plurality of background server 12a, 12b, 12c ... and name server 13.This year equalizer receives user's service request, and resolves the Virtual Service in service request; According to the corresponding relation of predefined Virtual Service and background server group, search background server group corresponding to Virtual Service; Select background server from the background server group, the corresponding IP address according to domain name nslookup from name server of background server, send to corresponding background server according to the IP address by service request.
As shown in Figure 2, load equalizer embodiment comprises: receiver module 21, parsing module 22, memory module 23, search module 24, select module 25 and sending module 26.Particularly, receiver module receives user's service request; Parsing module is resolved the Virtual Service in service request; Memory module is stored the corresponding relation of predefined Virtual Service and background server group; Search the corresponding relation of module according to Virtual Service and background server group, search background server group corresponding to Virtual Service; Select module to select background server from the background server group; The IP address that enquiry module is corresponding according to domain name nslookup from name server of background server; The IP address that sending module is corresponding according to domain name nslookup from name server of background server.
In addition, load equalizer also comprises: health assessment module 27, regularly inquiry IP address corresponding to background server domain name in name server, and background server corresponding to access IP address, to estimate the health status of background server.
Can't access if inquire about corresponding background server corresponding to ，HuoIP address, IP address less than domain name on name server, for background server, the unhealthy status sign is set; Can access if inquire background server corresponding to ，QieIP address, IP address corresponding to domain name on name server, for background server, the health status sign is set.
Select module to select the background server of payload traffic request according to health status and the loading condition of background server from the background server group.Select health and the lower background server payload traffic request of load, such as non-standing algorithm, training in rotation algorithm, minimum join algorithm, response speed algorithm or continuation algorithm etc. according to load-balancing algorithm.
Based on said system and device, the invention provides a kind of load-balancing method based on domain name access, as shown in Figure 3, the method embodiment comprises the following steps:
At first, on load equalizer, configure as follows:
(1) define dns server on load equalizer
Specific definition is: L4switch (config) #dns server 211.139.5.29211.139.5.30.
Wherein, dns server can be defined as many, in case Single Point of Faliure.
(2) define background server on load equalizer
Definition to background server is mainly to define server ip or corresponding domain name, the service of server.
Specific definition is: L4switch (config) #slb real<protocol ><real_name ><real_ip or DNS_name ><real_port > [max_conn] [hc_type] [hc_type] [hc_down] [time_out], the implication of major parameter is as shown in table 1 below
Table 1
(3) definition background server group, and background server is added in the background server group
Specific definition is: L4switch (config) #slb group method<group_name > [method[other_parms]], the implication of major parameter is as shown in table 2 below,
Table 2
Can also be defined as: L4switch (config) #slb group member<group_name<real_name > and [<weight > |<param_string >], the implication of major parameter is as shown in table 3 below,
Table 3
(4) defining virtual service
Specific definition is: L4switch (config) #slb virtual<protocol ><virtual_name ><virtual_ip ><virtual_port >, the implication of major parameter is as shown in table 4 below,
Table 4
| protocol | Application protocol type: dns, ftp, http, https, tcp, tcps, or udp |
| virtual_name | The title of Virtual Service, can not be identical with other Virtual Server |
| virtual_ip | The IP address of service externally is provided |
| virtual_port | TCP/UDP externally provides the port (as http protocol, being defaulted as 80) of service. |
(5) definition load balancing, and by Virtual Service and background server group binding
Specific definition is: L4switch (config) #slb policy<policy_type ><virtual_name ><group or real name ><param_args* ><precedence >, the implication of major parameter is as shown in table 5 below,
Table 5
Below with instantiation, method of the present invention is described.
When the service request that receives the user is access http://www.gz.chinamobile.com/xxt, have/xxt in the service request that load equalizer discovery user submits to, the corresponding Virtual Service of xxt.Search corresponding background server group according to this Virtual Service, principle according to load balancing, select a background server to provide service for the user, send the domain name of this background server of request analysis to name server, obtain IP address corresponding to this domain name, the service request that is about to the user turns to this website of http://www.xxt.gz.chinamobile.com/.
If user's access is domain name, so, the user just must, at first to this domain name of dns resolution, obtain IP address corresponding to domain name.
If that user's access is URL, so, service that can also be different according to the different choice of URL, such as, www.sina.com.cn/mail, be mail service, www.sina.com.cn/news is press service.Even, can also provide service according to user's IP address, such as, from Shanghai, provide a kind of service, from Guangdong, another service is provided.
In addition, load equalizer is also regularly inquired about the IP address corresponding to domain name of background server in name server, and background server corresponding to access IP address;
Can't access if inquire about corresponding background server corresponding to ，HuoIP address, IP address less than domain name on name server, for background server, the unhealthy status sign is set; Can access if inquire background server corresponding to ，QieIP address, IP address corresponding to domain name on name server, for background server, the health status sign is set.
When load equalizer is selected background server, according to health status sign and the loading condition of background server, select the background server of payload traffic request from the background server group.
Load-balancing method, system and load equalizer based on domain name access of the present invention utilizes domain name to set background server on load equalizer, sets up domain name and the background server corresponding relation that Virtual Service is provided, and according to domain name, searches background server.Because background server is defined by domain name, when the IP address that administrative staff have revised background server, administrative staff are without the configuration file of revising in load equalizer, and load equalizer still can, according to domain name lookup to corresponding background server, can not have influence on the access of user to business.And, for the server admin personnel, in load equalizer, adopt the configuration effort of domain name definition background server very simple.In addition, mostly all be based on the main frame that domain name defines because Internet is upper, so the present invention can allow load balancing more easily be applied in the occasion of Internet.
It should be noted that: above embodiment is only unrestricted in order to the present invention to be described, the present invention also is not limited in above-mentioned giving an example, and all do not break away from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in claim scope of the present invention.
Claims (9)
1. the load-balancing method based on domain name access, is characterized in that, utilizes domain name to set background server, and the method comprises:
Receive service request, and resolve the Virtual Service in described service request;
According to the corresponding relation of predefined Virtual Service and background server group, search background server group corresponding to described Virtual Service;
Select background server from described background server group, according to the domain name of described background server, inquire about the IP address that domain name is corresponding from name server, according to described IP address, described service request is sent to corresponding background server.
2. the load-balancing method based on domain name access according to claim 1, is characterized in that, also comprises:
The regularly IP address corresponding to domain name of inquiry background server in name server, and background server corresponding to access IP address;
If on the domain name server inquiry less than domain name corresponding IP address, or background server corresponding to described IP address can't access, and for described background server, the unhealthy status sign is set;
If inquire the IP address that domain name is corresponding on the domain name server, and background server corresponding to described IP address can access, and for described background server, the health status sign is set.
3. the load-balancing method based on domain name access according to claim 2, is characterized in that, from described background server group, selects background server to comprise:
Select the background server of the described service request of load according to health status sign and the loading condition of described background server from described background server group.
4. the SiteServer LBS based on domain name access, is characterized in that, comprising: name server and the load equalizer that utilizes domain name setting background server,
The domain name server, for the domain name of storing virtual service and the corresponding relation of IP address;
Described load equalizer, for receiving user's service request, and resolve the Virtual Service in described service request; According to the corresponding relation of predefined Virtual Service and background server group, search background server group corresponding to described Virtual Service; Select background server from described background server group, according to the domain name of described background server, inquire about the IP address that domain name is corresponding from the domain name server, according to described IP address, described service request is sent to corresponding background server.
5. the SiteServer LBS based on domain name access according to claim 4, is characterized in that,
Described load equalizer, for regularly at name server, inquiring about the IP address corresponding to domain name of background server, and access background server corresponding to described IP address; If on the domain name server inquiry less than domain name corresponding IP address, or background server corresponding to described IP address can't access, and for described background server, the unhealthy status sign is set; If inquire the IP address that domain name is corresponding on the domain name server, and background server corresponding to described IP address can access, and for described background server, the health status sign is set.
6. the SiteServer LBS based on domain name access according to claim 5, it is characterized in that, described load equalizer, select the background server of the described service request of load for the sign of the health status according to described background server and loading condition from described background server group.
7. a load equalizer, is characterized in that, utilizes domain name to set background server, and described load equalizer comprises:
Receiver module, for receiving user's service request;
Parsing module, for resolving the Virtual Service of described service request;
Memory module, for storing the corresponding relation of predefined described Virtual Service and background server group;
Search module, for the corresponding relation according to described Virtual Service and background server group, search background server group corresponding to described Virtual Service;
Select module, for from described background server group, selecting background server;
Enquiry module, inquire about IP address corresponding to domain name for the domain name according to described background server from name server;
Sending module, inquire about IP address corresponding to domain name for the domain name according to described background server from the domain name server.
8. load equalizer according to claim 7, is characterized in that, also comprises: the health assessment module, for regularly at name server, inquiring about the IP address corresponding to domain name of background server, and access background server corresponding to described IP address; If on the domain name server inquiry less than domain name corresponding IP address, or background server corresponding to described IP address can't access, and for described background server, the unhealthy status sign is set; If inquire the IP address that domain name is corresponding on the domain name server, and background server corresponding to described IP address can access, and for described background server, the health status sign is set.
9. load equalizer according to claim 8, is characterized in that, described selection module is selected the background server of the described service request of load for the sign of the health status according to described background server and loading condition from described background server group.
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| CN107493351A (en) * | 2017-10-09 | 2017-12-19 | 郑州云海信息技术有限公司 | A kind of client accesses the method and device of the load balancing of storage system |
| CN107493351B (en) * | 2017-10-09 | 2021-06-29 | 郑州云海信息技术有限公司 | Load balancing method and device for client to access storage system |
| CN109936592A (en) * | 2017-12-15 | 2019-06-25 | 中国移动通信集团浙江有限公司 | Method, apparatus, electronic equipment and the storage medium of service processing |
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| CN108989479B (en) * | 2018-07-11 | 2023-05-16 | 湖北省楚天云有限公司 | Method and device for configuring secondary domain name of cloud computing platform |
| CN109743392A (en) * | 2019-01-07 | 2019-05-10 | 北京字节跳动网络技术有限公司 | A kind of load-balancing method, device, electronic equipment and storage medium |
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