CN112261095B - Load distribution realization system and method based on two-stage proxy - Google Patents
Load distribution realization system and method based on two-stage proxy Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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Abstract
The invention discloses a load distribution realization system and a method based on two-stage proxy, wherein the system comprises an access unit and a service unit, the access unit comprises a first switch, a service request module, a local virtual service gateway and a first proxy server; the service unit comprises a second switch, a service providing module and a second proxy server, wherein the second proxy server is also connected with the first proxy server through a dispatching data network; when a service request module in an access unit initiates a service call request, directly making a service request to a local virtual service gateway; the local virtual service gateway realizes load distribution based on a preset strategy, forwards the load distribution through the first proxy server and the second proxy server, accesses the service of the appointed service member unit, and then returns the access result to the service request module in the access unit. The invention realizes that the service request module can carry out service call across two-stage agents and carry out distribution and switching according to the health condition of the service unit.
Description
Technical Field
The invention belongs to the technical field of power automation systems, and particularly relates to a load distribution realizing system and method based on two-stage agents, in particular to a load distribution realizing system and method based on two-stage agents in a service multi-activity environment of a power grid dispatching control system.
Background
In order to improve stability and reliability of service systems, systems in various industries generally construct a plurality of service centers, and a multi-activity mechanism is adopted among the service centers to realize load splitting and fault switching of service access. The service center provides a series of services for external application to call, and usually three layers of routes of the service center network are reachable, that is, the external application can be connected to an IP address and a port number of a certain service center to access the corresponding services. Load splitting among a plurality of service centers is generally realized through global load balancing (Global Server Lond Balance, GSLB) equipment, a domain name system is built in the system, the GSLB equipment resolves a domain name into an IP address of a certain service center according to a strategy, and then the IP address and a port corresponding to a service are directly accessed to complete service call.
In the power grid dispatching automation system, different dispatching mechanisms are connected through dispatching data networks. Unlike conventional three-layer interconnection network structures, networks between different scheduling mechanisms cannot be directly routed and reachable, and only networks among several proxy server nodes deployed at the edge of the network can be communicated, and if other nodes need to communicate with another service center, the other nodes must be implemented through forwarding (application layer) of the proxy server nodes, and the proxy server nodes do not have a routing function.
The service forwarding of the proxy server node is an implementation of an application layer and is mainly used for remote service call among different service centers. When the application of a certain dispatching organization calls the service of another organization, the domain name (corresponding to the service center) and the service name (corresponding to the specific service port of the service center) of the service request are firstly sent to the local proxy server node, and after the local proxy server node analyzes, the domain name and the service name are sent to the proxy server node of the opposite end, and then the domain name and the service name are forwarded to the actual background service.
After the dispatching automation system introduces a multi-activity mechanism, a plurality of flat dispatching mechanisms are used as service centers and simultaneously provide services to the outside. When the next scheduling mechanism is used as a service requester to initiate a service request to a service center, the request needs to be distributed to different centers according to the needs. Due to the network structure of the dispatch automation system, the background service node network of the service center is not reachable, so that the conventional GLSB splitting is adopted, and the method of accessing the service through the IP address and the port cannot work in this case, because even if the GLSB splitting returns the correct IP address, the external application cannot access the address.
Disclosure of Invention
Aiming at the problems, the invention provides a load distribution realizing system and method based on two-stage agents, which solve the problem that a conventional load distribution mode cannot be suitable for remote service call among different institutions of a power grid dispatching control system, are independent of a domain name system, realize that external application can carry out service call across the two-stage agents, and carry out distribution and switching according to the health condition of a service center.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a load splitting implementation system based on two-stage agents, including:
the access unit comprises a first switch, a service request module connected with the first switch, a local virtual service gateway and a first proxy server;
the system comprises a plurality of service units, a service providing module and a second proxy server, wherein each service unit comprises a second switch, and the service providing module and the second proxy server are connected with the second switch;
when a service request module in an access unit initiates a service call request, directly carrying out a service request to a local virtual service gateway in the access unit; the local virtual service gateway realizes load distribution based on a preset strategy, forwards the load distribution through a first proxy server and a selected second proxy server in the access unit, accesses the service of the appointed service unit, and then returns the access result to the service request module in the access unit.
Optionally, when the number of the access units is greater than 1, the first proxy server in each access unit is connected with the second proxy server in each service unit through the scheduling data network, so that each access unit is connected to all service units at the same time, and the service call request is distributed to any service unit.
Optionally, the number of local virtual service gateways, first proxy servers and/or second proxy servers is greater than 1.
Optionally, the local virtual service gateway includes a plurality of ports, each port corresponding to a certain service, and when the service request module in the access unit requests to access a different service, the service request module is connected to a different port of the local virtual service gateway.
Optionally, the local virtual service gateway includes:
the central state health checking module is used for regularly calling test services of each service unit based on the first proxy server and the second proxy server and judging the working state of the service unit;
and the distribution strategy definition module is internally provided with an equalization strategy, and distributes the call request of the service request module in the access unit to different service units according to different strategies.
Optionally, when the service request module in the access unit initiates a service call request, a session is established, and when the central state health check module determines that the service unit is normal, subsequent service accesses of the session are kept in the same service unit; when the central state health check module judges that the current service unit fails, the session is rebuilt, and the subsequent service access is shunted to the service unit with normal state.
Optionally, the equalization strategy includes:
splitting according to the IP network segment loads corresponding to the service units; or (b)
And carrying out load splitting according to the weight predefined by the service unit.
Optionally, the local virtual service gateway is deployed independently from the first proxy server or on the first proxy server node.
In a second aspect, the present invention provides a load splitting implementation method based on two-stage proxy, including:
the service request module in the access unit is utilized to directly carry out service request to the local virtual service gateway in the access unit;
and realizing load distribution by using the local virtual service gateway based on a preset strategy, forwarding through a first proxy server connected with the local virtual service gateway and a second proxy server in the selected service unit, accessing the service of the designated service providing module in the service unit, receiving the access result fed back by the service providing module, and finally returning the access result to the service request module in the access unit.
Optionally, the method further comprises: when a service request module in an access unit initiates a service call request, a session is established, and under the normal condition of a service unit, the subsequent service access of the session is kept in the same service unit; when the current service unit fails, session reestablishes, and subsequent service accesses are shunted to the service unit in normal state.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by establishing the local virtual service gateway and the service access of the reverse proxy to different service units, the load split across the two-stage proxy is realized, the problems that the network between power grid dispatching mechanisms cannot be directly used, and the conventional load split is difficult to use are solved, the service requirement of a power grid regulation and control system is met, and the service liveness of the system is effectively supported.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
FIG. 1 is a block diagram of a two-level proxy-based load splitting implementation system in one embodiment of the invention;
fig. 2 is a schematic diagram of a load splitting implementation process in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The principle of application of the invention is described in detail below with reference to the accompanying drawings.
Example 1
The embodiment of the invention provides a load distribution realizing system based on two-stage agents, which comprises the following steps:
the access unit comprises a first switch, a service request module connected with the first switch, a local virtual service gateway and a first proxy server;
the service unit comprises a second switch, a service providing module and a second proxy server, wherein the service providing module and the second proxy server are connected with the second switch, and the second proxy server is also connected with the first proxy server through a dispatching data network;
when a service request module in an access unit initiates a service call request, directly making a service request to a local virtual service gateway; the local virtual service gateway realizes load distribution based on a preset strategy, forwards the load distribution through the first proxy server and the second proxy server, accesses the service of the appointed service unit, and then returns the access result to the service request module in the access unit.
In the embodiment of the invention, the mode of accessing the local service and then carrying out load splitting is adopted, the cross-two-stage proxy service call is completed by the local virtual service gateway, the problem that the internal network of the service unit cannot be directly accessed is avoided, and the external application accesses different service units without splitting by using domain name resolution through GLSB (global system for mobile communication), but directly accesses the IP address of the local virtual service gateway. .
In the embodiment of the invention, when the number of the access units is greater than 1, the first proxy server in each access unit is respectively connected with the second proxy server in each service unit, so that each access unit is simultaneously connected to all the service units, and the service call request is shunted to any one service unit.
In the embodiment of the invention, the number of the local virtual service gateway, the first proxy server and/or the second proxy server is greater than 1, single-point faults are avoided, and any virtual service gateway can independently complete the reverse proxy function of the multi-active service unit service.
In the embodiment of the invention, the local virtual service gateway comprises a plurality of ports, each port corresponds to a certain type of service, and when the service request module in the access unit requests to access different services, the service request module is connected to different ports of the local virtual service gateway.
In an embodiment of the present invention, the local virtual service gateway includes:
the central state health checking module is used for regularly calling test services of each service unit based on the first proxy server and the second proxy server and judging the working state of the service unit;
and the distribution strategy definition module is internally provided with an equalization strategy, and distributes the call request of the service request module in the access unit to different service units according to different strategies.
When a service request module in an access unit initiates a service call request, a session is established, and when the central state health check module judges that the service units are normal, the subsequent service access of the session is kept in the same service unit; when the central state health check module determines that the current service unit fails, session reestablishment, and subsequent service access is shunted to the service unit with normal state.
In an embodiment of the present invention, the equalization strategy includes:
splitting according to the IP network segment loads corresponding to the service units; or (b)
And carrying out load splitting according to the weight defined by the service unit.
In the embodiment of the invention, the service access is forwarded through the proxy server node, the service call flow among power grid dispatching mechanisms is followed, the service access requirement of the cross-proxy is met, and the local virtual service gateway and the first proxy server are independently deployed or are deployed on the first proxy server node.
The system and its operation in the embodiments of the present invention are described in detail below with reference to specific application 1.
As shown in fig. 1, in the grid dispatching control system, cloud services of a regulatory cloud are operated at two service centers a and B (i.e., service units) in different places, and monitoring centers C and D (i.e., access units) are connected with the service centers a and B through dispatching data networks and access services provided by the service centers. The service requester in fig. 1 is a service request module, and the service provider is a service providing module.
Taking the service center A as an example, as one end for providing service, all nodes of the service center are connected to a core switch of an intranet, and only 2 proxy server nodes are connected to the intranet switch and also to a dispatching data network. Likewise, the monitoring center C, as one end for initiating service call, has only 2 proxy server nodes connected to the dispatch data network.
The internal node of the monitoring center C cannot directly communicate with the internal node network of the service center a. When the monitoring system C calls the service of the service center A, the local virtual service gateway is accessed first, and the local virtual service gateway is forwarded through the two-stage proxy server to call the service. The local 2 proxy server nodes are redundant and completely peer to each other, and after 1 proxy server node fails, the local 2 proxy server nodes can be forwarded through another proxy server.
The service center A and the service center B are deployed by adopting a dual-activity mechanism, and simultaneously provide services to the outside. When the states of the two service centers are normal, the service call of the monitoring system is shunted to the two centers by the load; when one hub fails, the service call of the monitoring hub is forwarded to the normal hub.
As shown in fig. 2, the load splitting method specifically includes the steps of:
step 1, a local service gateway module is deployed in a monitoring center, and a local virtual service gateway E and a local virtual service gateway F are respectively deployed on 2 nodes to form redundant mutual backup; the local virtual service gateway, as a functional module, may also be deployed and run on proxy nodes, here deployed on 2 independent nodes for better illustration of relationships to other functions as well.
Step 2, the local virtual service gateway E, F of the monitoring center periodically sends a test service access request to the service center, and confirms the state of the service center according to the return condition of the result; the service access requests of the monitoring center are only shunted to the normally-operating service center.
Step 3, when the application program of the monitoring center accesses the service of the service center, directly initiating a request to the local virtual service gateway, and taking the local virtual gateway as a service provider; the local service virtual gateway reverse proxies all service access requests from the current monitoring center to the business center A, B.
And 4, after the local virtual service gateway of the monitoring center receives the local service request, carrying out actual remote service call according to the configuration strategy and the state of the remote service center. The service call passes through the local proxy node and the remote proxy node and finally reaches the actual service provider of the service center.
And step 5, running a service proxy function module on the proxy node, and forwarding the SOA service call of the application layer of the dispatching control system, thereby meeting the application service cross-region remote call mechanism of the dispatching control system.
From the above steps, it can be seen that the external application of the power grid regulation system accesses the service of the multi-activity service center in two steps, the first step is to access the local virtual service gateway; and secondly, the local virtual service gateway performs remote service call across the two-stage proxy according to the load distribution result. Because the local virtual service gateway, the service agent and the service center are all in redundant configuration, the single-point fault of the system does not affect the whole load distribution function.
Example 2
Based on the same inventive concept as embodiment 1, the embodiment of the present invention provides a load splitting implementation method based on two-stage proxy, including:
the service request module in the access unit is utilized to directly carry out service request to the local virtual service gateway;
and the local virtual service gateway is utilized to realize load distribution based on a preset strategy, the load distribution is forwarded through a first proxy server connected with the local virtual service gateway and a second proxy server in the service unit, the service of a designated service providing module in the service unit is accessed, the access result fed back by the service providing module is received, and finally the access result is returned to a service request module in the access unit.
In an embodiment of the present invention, the method further includes: when a service request module in an access unit initiates a service call request, a session is established, and under the normal condition of a service unit, the subsequent service access of the session is kept in the same service unit; when the current service unit fails, session reestablishes, and subsequent service accesses are shunted to the service unit in normal state.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A two-level proxy-based load splitting implementation system, comprising:
the access unit comprises a first switch, a service request module connected with the first switch, a local virtual service gateway and a first proxy server;
the system comprises a plurality of service units, a service providing module and a second proxy server, wherein each service unit comprises a second switch, and the service providing module and the second proxy server are connected with the second switch;
when a service request module in an access unit initiates a service call request, directly carrying out a service request to a local virtual service gateway in the access unit; the local virtual service gateway realizes load distribution based on a preset strategy, forwards the load distribution through a first proxy server and a selected second proxy server in the access unit, accesses the service of the appointed service unit, and then returns an access result to a service request module in the access unit;
the local virtual service gateway comprises a plurality of ports, each port corresponds to a certain type of service, and when a service request module in an access unit requests to access different services, the service request module is connected to different ports of the local virtual service gateway;
the local virtual service gateway comprises:
the central state health checking module is used for regularly calling test services of each service unit based on the first proxy server and the second proxy server and judging the working state of the service unit;
the distribution strategy definition module is internally provided with an equalization strategy, and distributes the call request of the service request module in the access unit to different service units according to different strategies;
when a service request module in an access unit initiates a service call request, a session is established, and under the condition that a central state health check module judges that a service unit is normal, subsequent service access of the session is kept in the same service unit; when the central state health check module judges that the current service unit fails, session rebuilding is carried out, and subsequent service access is shunted to the service unit with normal state;
the equalization strategy includes:
splitting according to the IP network segment loads corresponding to the service units; or (b)
And carrying out load splitting according to the weight predefined by the service unit.
2. The two-stage proxy-based load splitting implementation system of claim 1, wherein: when the number of the access units is greater than 1, the first proxy server in each access unit is connected with the second proxy server in each service unit through the scheduling data network, so that each access unit is connected to all the service units at the same time, and the service call request is distributed to any one service unit.
3. The two-stage proxy-based load splitting implementation system of claim 1, wherein: the number of the local virtual service gateway, the first proxy server and/or the second proxy server is greater than 1.
4. The two-stage proxy-based load splitting implementation system of claim 1, wherein: the local virtual service gateway is deployed independently of the first proxy server or on the first proxy server node.
5. A method for implementing load splitting based on two-stage agents, comprising:
the service request module in the access unit is utilized to directly carry out service request to the local virtual service gateway in the access unit;
the local virtual service gateway is utilized to realize load distribution based on a preset strategy, and the load distribution is forwarded through a first proxy server connected with the local virtual service gateway and a second proxy server in a service unit, so as to access the service of a designated service providing module in the service unit, receive an access result fed back by the service providing module, and finally return the access result to a service request module in an access unit;
the local virtual service gateway comprises a plurality of ports, each port corresponds to a certain type of service, and when a service request module in an access unit requests to access different services, the service request module is connected to different ports of the local virtual service gateway;
the local virtual service gateway comprises:
the central state health checking module is used for regularly calling test services of each service unit based on the first proxy server and the second proxy server and judging the working state of the service unit;
the distribution strategy definition module is internally provided with an equalization strategy, and distributes the call request of the service request module in the access unit to different service units according to different strategies;
when a service request module in an access unit initiates a service call request, a session is established, and under the condition that a central state health check module judges that a service unit is normal, subsequent service access of the session is kept in the same service unit; when the central state health check module judges that the current service unit fails, session rebuilding is carried out, and subsequent service access is shunted to the service unit with normal state;
the equalization strategy includes:
splitting according to the IP network segment loads corresponding to the service units; or (b)
And carrying out load splitting according to the weight predefined by the service unit.
6. The two-stage proxy-based load splitting implementation method of claim 5, further comprising: when a service request module in an access unit initiates a service call request, a session is established, and under the normal condition of a service unit, the subsequent service access of the session is kept in the same service unit; when the current service unit fails, session reestablishes, and subsequent service accesses are shunted to the service unit in normal state.
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