KR101254312B1 - Method for load balancing in program disperse distribution apparatus - Google Patents

Abstract

A plurality of download servers connected to a network to enable data communication with a unique IP address, and a plurality of client terminals connected to at least one of the plurality of download servers through the network to download necessary information therefrom. Provides a server load balancing method that can be very usefully used in a program distributed computer device. The server load balancing method includes a connection environment file in which the number of accessible servers, the number of access servers, the IP address of the access server, the number of IP addresses, the class information of the corresponding IP, and the index information are set to the plurality of client terminals. Setting and storing, and connecting the server corresponding to the access server IP address corresponding to the remaining value obtained by dividing the index value corresponding to the C class of its IP address by the number of access servers in the connection environment file. Consists of steps.

Program distributed distribution, download server, load balancing, IP address C class, index information.

Description

Server Load Balancing Method for Program Distributed Deployment Devices {METHOD FOR LOAD BALANCING IN PROGRAM DISPERSE DISTRIBUTION APPARATUS}

1 is a network diagram suitable for using the method according to the invention.

2 is a control flow diagram for load balancing between a client and a server according to a preferred embodiment of the present invention.

3 is a table showing a file distribution server connection environment file according to a preferred embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS to the main parts of the drawings "

10: network, 12: download server,

14: client terminal, 16: host.

The present invention relates to a data communication method in a distributed computing network having a client-server, and more particularly, to download from a server by selecting one of a plurality of servers to which a client data terminal is linked. The present invention relates to a server load balancing method of a program distribution and distribution device for optimally adjusting the loading of.

A distributed computer network having a client-server, for example, one host computer installed at the main office, connected to the host computer and connected to all or part of the network and other resources in the network to other computers in the network. And a plurality of client terminals that access the server through a network and transmit and receive the required data information in response to a request of a client and a server for controlling a file request and transmitting a corresponding file in response to a file request. The network may be at least one of a local area network (LAN), a wide area network (WAN), or a virtual private network (VPN). Can be interconnected to build a broadband network. In the above, the client terminal may be a client computer or an automatic teller machine (ATM) installed in a branch or a branch to enable data communication.

A plurality of client terminals installed in the distributed computer network as described above need to transmit and receive necessary information to access at least one of the plurality of servers through the network and download corresponding data at the request of the client. Therefore, in a distributed computer network having such a structure, it is required to appropriately distribute the load of the server according to the number of client terminals.

As a conventional technique for distributing downloads of a server, a scheme in which connections are distributed to two download servers by dividing a point and a number into odd and even numbers on a client terminal. For example, after setting the IP (Internet Protocol) address, the point, and the number of information on the client terminal, and executing the execution environment execution file, the client terminal has a preset IP address by dividing the point, the number of the client terminal into even and odd numbers. It was configured in such a way that it could be divided into multiple servers.

However, in the conventional method, when the server connected to the host computer is added (added), the operator must directly modify the IP address, point, and key information set on the client terminal for load balancing of the servers. There was an inconvenience of mode management of the information of the client terminal.

In addition, when the client terminal is added, it is inconvenient because the information can be set so that the data communication between the client terminal and the server is possible only if the operator knows the server information to which the client terminal accesses. Only one backup server was set up, so data backup was not smooth.

Due to the above problems, the server load balancing method according to the related art does not perform a balanced and active load balancing when the client terminal and the server are added, thereby preventing the communication of data smoothly, and the flexible configuration of the backup server and the connection environment. This was difficult.

Therefore, in the distributed computer network having a plurality of servers and client terminals, a distributed program for automatically distributing and controlling the download of a server when the client terminal is connected when a plurality of servers to which the client terminal is accessible or a server is added. It is to provide a server load balancing method of the device.

Another object of the present invention is to provide a server load balancing method of a program distribution distribution apparatus capable of automatically distributing load of a download server without modification of connection environment information between client and server even if there is an expansion of a client terminal and a download server.

It is still another object of the present invention to provide a program distributed distribution providing a file distributed server connection environment in which a client terminal selects and connects a server so that download of the plurality of servers is minimized in a distributed computer network having a plurality of servers and client terminals. A server load balancing method of a device is provided.

The present invention for achieving the above object, the number of servers that can be connected, the number of attempted server, the IP address of the access server, the number of C class (IP address C class) of the IP address, the C class information of the corresponding IP and its index information Is set and stored in each of a plurality of client terminals, and the client terminal divides the index value corresponding to the C class of its IP address in the connection configuration file by the number of access servers. And connecting a server corresponding to the access server IP address corresponding to the obtained remaining value.

Each of the plurality of access servers connected to the network analyzes the IP address of the terminal transmitted from the client terminal and transmits the connection environment file of the server to the connected client terminal when the IP address is connected to another area. And transmitting the access permission response message to the client terminal after confirming the IP authentication when the analyzed IP address is connected to the client.

The number of access servers, the number of access attempt servers, the access server IP address, the number of C classes of IP addresses, the corresponding C class information, and the index thereof are preferably set to increase or decrease according to the number of servers connected to the network.

The connection environment file includes version environment information (version) information and virtual private network (VPN) IP address information, and the client terminal is connected to the connection configuration file (SC_CFG) transmitted from the server. The method may further include updating the set connection environment file when the version information and the version information of the connection configuration file TC_CFG set in the terminal thereof are different.

The client terminals may include updating a connection environment file set therein when the connection environment file is transmitted from the server, and newly connecting the server by the updated connection environment file information.

And if the client terminal has not been connected to the server for a predetermined time, calculating the value of the access server IP address by increasing the value of the C class of the connection environment file.

The client terminal may include acquiring a VPN server IP address from a connection environment file and accessing a server corresponding to an IP address value of the VPN server when a connection failure of a server corresponding to all access server IP addresses occurs. .

The server load balancing method of the program distributed computer apparatus as described above acquires one of a plurality of access server IP addresses by the remaining value obtained by dividing the index value of the IP address C class set inside the client terminal by the number of access servers. By accessing the connection information of the server set in the terminal is flexible, it is possible to automatically distribute the load balancing for the client terminal connecting to each server.

In addition, the client terminal can automatically update the server connection environment file set therein by the connection environment file transmitted from the server, so that the server connection flexibility can be provided, and the load balancing of the server for data download can be maintained in an optimal state. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings in which: FIG. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be noted that the embodiments of the present invention described below are intended to sufficiently convey the spirit of the present invention to those skilled in the art. It should also be noted that detailed descriptions of well-known functions and configurations in the art that may unnecessarily obscure the subject matter of the present invention are omitted.

1 shows a network diagram suitable for using the method according to the invention. The program distributing device 10 includes a network 12 as an essential component thereof, which is at least one of a local area network (LAN) and a wide area network (WAN), which are connected by a network interconnector. It may be. The network 12 includes one or more client terminals 14i (where "i" is an integer as a, b, c, ... n, and are the same below) for transmitting and receiving data corresponding to a client's request. A plurality of down-load servers (hereinafter referred to as " servers ") 16i are connected to allow a connection from the client terminal 14i and download data corresponding to a request therefrom.

Each of the client terminals 14i has a connection environment file configured to access the server 16i therein, and acquires a server IP address set in the connection environment file and has a corresponding IP address through the network 12. A connection with server 16i is attempted to establish a communication channel.

Each of the servers 16i has a unique IP address and transmits / receives data to and from the client terminal 14i that attempts to connect among the plurality of client terminals 14 under the control of an application protocol (AP). In this case, each of the client terminals 14i applied to the present invention loads a server by selecting and accessing one of a plurality of servers by referring to information of a file distribution server (FDS) connection environment file according to the present invention. Balancing is performed, and the connection environment file is updated by checking version information transmitted from the connected server 16i.

2 is a control flowchart for load balancing between a client and a server according to an exemplary embodiment of the present invention, which is a procedure in which one client terminal 14i accesses the server 16i to download a work file requested by the client. Indicates.

3 is a table illustrating a file distribution server connection environment file 100 according to a preferred embodiment of the present invention, an example of which is set in each of the client terminals 14 by an operator or by transmission from the server 16. Indicates.

In FIG. 3, reference numeral 102 is connection environment file version information, 104 is a VPN server IP address, 106 is connection server number information, 108 is connection attempt server number information, 110 is connection server IP address, and 112 is a corresponding client terminal 14i. C class number information, and 114 are C class and index information of an IP address.

1 to 3 will be described in detail the steps of server load balancing in the program distribution apparatus according to an embodiment of the present invention.

In order to access the server 16i using the client terminal 14i, the operator must set up the FDS connection environment file 100 as shown in FIG. 3 in the client terminal 14i in order to configure an active and efficient server connection environment. .

The FDS connection environment file 100 has connection environment file version information 102 for application to the changed environment when the connection environment is changed as shown in FIG. 3, and the server for the server 16i to which the client terminal 14i is to be connected. The number information 106, the client terminal 14i, has access attempt server number information 108 to try to connect in the event of a connection failure, and access server IP address information 110 of each server 16i. In addition, the FDS connection environment file 100 includes C class number information 112 and corresponding C class information and index information 114 of an IP address of a point accessible to each server 16i.

When a new client terminal 14i is installed or a client attempts to access the server 16i using the client terminal 14i, the AP 20 in the client terminal 14i is set internally in step 21 of FIG. The IP address of the server 16i to be connected is computed and obtained by referring to the FDS connection environment file 100.

The step of calculating and obtaining the IP address of the server 16i to be connected is shown in Equation 1 below.

[Equation 1]

IP address of connected server = "Index value corresponding to C class" / "Destination value of the number of connected servers" FDSIPxy (where "x" and "y" are 0,1,2, .N Is taken as the server IP address.

For example, if the C class of the client terminal 14i is " 156.147.22 " as shown in Fig. 3, the index value corresponding to the C class of its own IP address is " 4 " Since the value of FDScnt) 106 is "3", the server IP to be connected is the remaining "1" of "4/3" of FDSIP00, FDSIP01, and FDSIP02 which represent the IP address of the server to be connected in FDS info in the connection environment file. Since the corresponding FDSIP01 corresponds to "156.147.25.147", the client terminal 14i attempts to connect to the server 16i having the IP address of "156.147.25.147" in step 22 of FIG.

Receiving the connection request message from the client terminal 14i, the server 16i checks the IP address and the connection environment file of the client terminal sent from the client terminal 14i, and allows the connection after the IP authentication or to another server. Search for the IP to connect to.

In case of the IP to be connected to another server in the search step, the server 16i is the corresponding server 16j (where j is i ?? j as a natural number such as 0, 1, 2, 3, etc.). In step 24 of FIG. 2, the connection environment file of FIG. 2 is transmitted to the corresponding client terminal 14i. The client terminal 14i, which has received the connection environment file 100 on the other server side by the above steps, updates the internal connection environment file by the connection environment file 100 transmitted from the server 16i, and updates the updated connection. In step 26 of FIG. 2, the server 16j is connected to the environment file 100.

If it is determined in the search step that the connection is allowed after IP authentication, the server 16i transmits an access permission message to the corresponding client terminal 14i attempting to establish a communication channel in step 28.

When the client terminal 14i requests the current connection environment file version to the server 16i connected in step 30 of FIG. 2, the server 16i provides the server connection environment file version information stored therein in step 32. send. At this time, the client terminal 14i compares the version information 102 of the connection environment file TC_CFG configured therein with the connection environment file SC_CFG transmitted from the server.

If the result of the comparison between the two connection environment files TC_CFG and SC_CFG is different, the corresponding client terminal 14i sends a new connection environment file request message to the corresponding server 16i in which the communication channel is formed in step 34 of FIG. The request is transmitted from the server 16i. In response to the connection environment file request message, when the server 16i transmits the new connection environment file 100 in step 36, the client terminal 14i downloads the new connection environment file and restarts the connection according to the new connection environment. Also do. At this time, the method of connecting the server 16i by receiving a new connection environment file is as described above.

On the other hand, the connection environment file 100 configured as shown in FIG. 3 can be written in the form of a text document, and if there is a security problem, it should be recognized that a binary file can be converted and used.

When a data communication channel is formed between the client terminal 14i and the server 16i by the above steps, the client terminal 14i and the server 16i perform the work files required by performing steps 38 to 48 of FIG. 3. Download to the client terminal 14i and terminate the mutual connection.

If the client terminal 14i acquires the IP address of the server to be accessed in step 22 or 26 of FIG. 2 and connects to the corresponding server 16i, the client terminal 14i corresponds to the preset time (for example, about 1 minute and 30 seconds). If there is no response from the server 16i, the client terminal 14i increases the value of class C in the connection environment file 100 as shown in FIG. Attempt to connect (16j).

By the above control step, when the connection failure of the server corresponding to all the connection server IP addresses 110 shown in FIG. 3 occurs, the client terminal 14i acquires the VPN server IP address 104 from the connection environment file. Obtain the IP address and connect to the VPN server.

The AP 20 of the client terminal 14i compares the version of the connection environment file 100 finally updated the next time it connects to the server with the version of the connection environment file on the server 16i and compares its own connection environment file. First, it is checked whether or not 100 has been changed, and when it is changed, a new version of the connection environment file is downloaded as described above.

As described above, the information about the client terminal 14i and the access server to be connected to the server 16i by the distributed connection control of the server 16i according to the embodiment of the present invention is flexible and each server 16i It is possible to automatically distribute load balancing for the client terminal (14i) connecting to.

As described above, the server load balancing method of the program distribution distribution apparatus according to the embodiment of the present invention enables centralized batch processing of the connection environment between the client terminal and the server by using the connection environment file and the connection environment file version. When adding and adding servers, load balancing function is provided without manually setting connection information of the server, and it is possible to flexibly support connection conversion to a backup server in case of server failure. In addition, it can be very useful in a client-server environment in which the information of the client terminal or server changes frequently.

Claims (7)

Setting and storing a connection environment file in which the number of accessible servers, the number of connection attempt servers, the IP address of the access server, the number of IP addresses, the class information of the corresponding IP, and the index information are set in a plurality of client terminals, respectively; Connecting, by the client terminal, a server corresponding to the access server IP address corresponding to the remaining value obtained by dividing the index value corresponding to the C class of its IP address by the number of access servers in the connection environment file; Load balancing method. The method of claim 1, wherein each of the plurality of access servers analyzes an IP address of a terminal transmitted from the client terminal and transmits an access environment file of the corresponding server to the client terminal when the IP address is to be connected to another region. And transmitting an access permission response message to the client terminal after confirming the IP authentication when the received IP address is connected to the client. The method of claim 2, wherein the number of access servers, the number of access attempt servers, the number of access server IP addresses, the number of classes of IP addresses, the corresponding class information, and the indexes are set to increase or decrease according to the number of access servers connected to the network. Server load balancing method. The connection environment file of claim 3, wherein the connection environment file includes connection environment file version information and virtual private network IP address information, and the client terminal receives the version information of the connection environment file transmitted from the server and the connection environment file set in its own terminal. Updating the set connection environment file when the version information of the server is different. The method according to claim 1, wherein the client terminals update a connection environment file set therein when the connection environment file is transmitted from the connection server, and newly connect the server with the updated connection environment file information. Server load balancing method comprising the steps of. The method of claim 5, wherein the client terminal comprises the step of calculating the value of the access server IP address by increasing the value of the class C of the connection environment file when the server is not connected for a predetermined time Server load balancing method. The method of claim 6, wherein the client terminal acquires a VPN server IP address from a connection environment file and connects a server corresponding to an IP address value of the server for VPN in case of a failure of a server corresponding to all accessible access server IP addresses. Server load balancing method comprising the.

Images