JP2000293496A - Decentralizing device for service load of network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decentralize the load on a server which is providing various services over a network by informing a terminal of the IP address of a service providing server which has a lighter load according to the load states of respective service providing servers. SOLUTION: A domain name system(DMS) process part d1 informs a load decentralizing process part d3 of the IP address [190.10.1.1] of a Web server b1 and the IP address [190.10.1.2] of a Web server b2. The load decentralizing process part d3 confirms information on the loads of the Web servers b1 and b2 corresponding to the IP addresses [190.10.1.1] and [190.10.1.2] reported from the DNS process part d1 and then informs the DNS process part d1 of the IP address of a Web server having a lighter load at this point of time. Then, the IP address [190.10.1.1] of the Web server b1 is transferred from the DNS process part d1 to a DNS process part c1 and further sent to a terminal X.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a service load distribution device in a network, and relates to a technology for distributing loads of servers providing various services on the network.

[0002]

2. Description of the Related Art In the Internet, when a terminal wants to connect to a Web site composed of a plurality of Web servers, the terminal:
First, connect to the provider and DNS managed by this provider
(Domain Name System) We want to connect to the server
By presenting the domain name of the site b, the IP address of the Web server corresponding to this domain name is obtained. At this time, the DNS server searches the database managed by itself using the domain name input from the terminal as a key, thereby obtaining the IP address corresponding to the domain name.
The address is detected, and this IP address is transmitted to the terminal.

Here, when a Web site is composed of a plurality of Web servers, a plurality of IP addresses corresponding to the domain name exist for each Web server. , The IP address corresponding to the domain name is detected and the IP address of any Web server corresponding to the domain name is transmitted to the terminal regardless of the load status of the Web server.

[0004] However, the load status of each Web server in a Web site is not uniform, and is constantly changing. Therefore, in order to operate a Web site efficiently, it is necessary to realize terminal connection in consideration of the load status of each Web server. By doing so, the terminal can more efficiently receive information from the Web site.

The present invention has been made in view of the above-described problems, and has the following objects. (1) Distribute the load of servers providing various services on the network. (2) Various services are efficiently provided on a network.

[0006]

In order to achieve the above object, according to the present invention, as a first means, a service providing site in which a plurality of service providing servers of the same kind are registered is provided with service information in response to a request from a terminal. A load distribution processing unit for detecting the load status of each service providing server, and a domain name of a service providing site, wherein the load balancing processing unit detects a load status of each service providing server. When a service information provision request is received from a terminal by specifying a domain name, a load is stored based on the load status of each service providing server detected by the load distribution processing unit. Address notifying means for notifying the terminal of the IP address of the lighter service providing server to the terminal. To adopt the means.

[0007] As a second means, in the first means, the load distribution processing unit and the IP address notifying means are provided on a router to which each service providing server is connected, and to the router of the service providing server. When the connection is detected, after automatically assigning an IP address to each service providing server, the IP address notifying means includes IP address notifying means for notifying the IP address to the IP address notifying means. The IP address notified from the means is registered in the database.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a service load distribution device in a network according to the present invention will be described below with reference to the drawings.

FIG. 1 is a network configuration diagram to which the present embodiment is applied. In this figure, reference numeral A denotes a small-scale network composed of a plurality of terminals X, Y and Z, B denotes a Web site (service provision site) composed of a plurality of Web servers b1 and b2 (service provision servers), and C is a router that relays communication between the small-scale network A and the external network, and D is a router (service load balancing device) that relays communication between the Web site B and the external network.

The router C has a DN for searching an IP address corresponding to the domain name based on the domain name.
The S processing unit c1 is mounted. The terminals X, Y, and Z are connected to the router C and are DNS clients. The router D has a DNS processing unit d1 (IP address notifying means) and a DHCP (Dynamic Host Configuration Pr.
(otocol) processing section d2 (IP address allocating means) and load distribution processing section d3.

The DNS processing unit d1 has a database for associating the domain name of the Web site B with the IP addresses of the Web servers b1 and b2.
When a service information provision request is received from Web site B by designating a domain name from Z, the IP addresses of Web servers b1 and b2 corresponding to the domain name are searched and notified to terminals X, Y and Z. Is what you do.

The DHCP processing unit d2 includes a Web server b1,
When b2 is connected to the router D, an IP address is automatically assigned to each of the Web servers b1 and b2. That is, each of the Web servers b1 and b2 is a DHCP processing unit d
2 client (DHCP client). The DHCP processing unit d2 is a Web server b
When the IP addresses are assigned to the addresses 1 and b2, the assignment information is notified to the DNS processing unit d1 via the load distribution processing unit d3.

The load distribution processing unit d3 includes an access interface to the DNS processing unit d1 and the DHCP processing unit d2, detects the load status of the Web servers b1 and b2, and outputs the detection result to the DNS processing unit d1. Is what you do. The load distribution processing unit d3 is located, for example, in the data link layer on the router D, always detects the traffic of all packets passing through the router D, and based on this traffic, loads the Web servers b1, b2 Judge the situation.

That is, the load distribution processing unit d 3
b server b1, b2 and the IP address
It has a table that associates the number of packets addressed to the P address, and counts up the number of packets each time communication is performed to determine the load status of each of the Web servers b1 and b2.
Each Web server b1, connected to the router D,
The load distribution processing unit d3 may be configured to periodically send an ICMP echo request to b2 and determine the load status of the Web servers b1 and b2 based on the response speed to the ICMP echo request.

Next, the operation of the embodiment constructed as described above will be described in detail. First, processing for registering Web servers b1 and b2 in Web site B will be described. At this time, when detecting the connection of the web servers b1 and b2 to the router D, the DHCP processing unit d2 automatically assigns different IP addresses to the web servers b1 and b2. The DHCP processing unit d2 is, for example, a Web server b1
Is assigned to the Web server b2, and "190.10.1.2" is assigned as the IP address to the Web server b2. In the following description, it is assumed that the domain name of the website B is www.domain.co.jp.

When the assignment of the IP address is completed, the DHCP processing unit d2 sets the Web servers b1 and b2.
To the DNS processing unit d1 via the load distribution processing unit d3. The DNS processing unit d1
Thus, the IP address input via the load distribution processing unit d3 is registered in the database. That is, as shown in the drawing, I, which is one of the information of the Web server b1,
The P address is set to “190.10.1.1”, and the IP address, which is one of the information of the Web server b2, is set to “190.10.1.1”.
0.1.2. " The DNS processing unit d1
As shown in the figure, the web server b
1, b2 information, common domain name "www.domain.c
o.jp "is registered.

Subsequently, each Web server b
The IP addresses 1 and b2 are registered in the database managed by the DNS processing unit d1, and the W addresses of the web servers b1 and b2 are registered.
In a state where the connection registration to the website B has been completed, the W
The following describes the processing when connecting to the website B from the outside, for example, when the terminal X in the small-scale network A connects to the website B.

First, the terminal X requests to obtain the IP address of the website B to be connected to the DNS processing unit c1 of the router C (the domain name of the website B "www.domain.co.jp"). ). Upon receiving this request message, the DNS processing unit c1 searches the database managed by itself based on the domain name "www.domain.co.jp", and retrieves the domain name "www.domain.c".
o.jp ", enter the IP address registered corresponding to the domain name in terminal X.
Send to

However, normally, when a new connection is made from the small-scale network A to the website B, the domain name “www.domain.co.jp” of the website B is registered in the database of the DNS processing unit c1. It has not been. In this case, the DNS processing unit c1 transfers the request message received from the terminal X to the DNS processing unit of another adjacent router. For example, when the router D is adjacent to the router C, the DNS processing unit c1 of the router C becomes the DNS processing unit d1 of the router D.
Transfer to

The DNS processing unit d1 of the router D receiving the request message searches the database managed by itself based on the domain name "www.domain.co.jp" in the same manner as the DNS processing unit c1. . As described above, the domain name of Web site B “ww
Since “w.domain.co.jp” is registered, the DNS processing unit d1 detects all IP addresses corresponding to the domain name “www.domain.co.jp” and notifies the load distribution processing unit d3. I do.

Here, the database managed by the DNS processing unit d1 has the domain name "www.domai" as described above.
n.co.jp ”, the IP address“ 190.10.1.1 ”of the Web server b1 and the Web server b2
Is registered as the IP address "190.10.1.2". Therefore, the DNS processing unit d1 sets the IP address “190.10.1.1” of the Web server b1 and the IP address of the Web server b2.
The address "190.10.1.2" is notified to the load distribution processing unit d3.

The load distribution processing unit d3 operates as described above.
Each IP address "190.10.
1.1 and 190.10.1.2 Web servers b1 and b
2 is confirmed by the above-described method, and at this time, the IP address of the Web server with the smaller load is set to DN.
Notify the S processing unit d1. For example, when it is determined that the load of the Web server b1 is lighter than that of the Web server b2,
The load distribution processing unit d3 notifies the DNS processing unit d1 of the IP address "190.10.1.1" of the Web server b1.

The IP address "19" of the Web server b1
"0.10.1.1" is transferred from the DNS processing unit d1 to the DNS processing unit c1, and further transmitted from the DNS processing unit c1 to the terminal X. As a result, the terminal X obtains the IP address "190.10.
1.1 ", it is possible to connect to the web server b1 and obtain desired information.

In the above embodiment, by using the DHCP processing unit d2, the domain name of the Web site B "www.do
main.co.jp "and the web server b in the website B
1, b2 IP address "190.10.1.1", "190.10.1.2"
Although the configuration is such that the router D is not provided with the DHCP processing unit d2, the registration in the database may be performed manually. That is, a database in which the IP addresses of all the Web servers b1 and b2 participating in the Web site B are registered is created in advance, and such a database is mounted on the router D and the DNS processing unit d2
Put under control.

In the above embodiment, the Web site B
Has been described in connection with the web servers b1 and b2. However, as is well known, the servers providing services on the Internet include the web servers b1 and b2 described above.
In addition to the Web services provided by the above, there are services that provide an ftp service, a mail service, and the like. Therefore, regarding the host domain name, it is necessary for the user to set the name prescribed for each service content in the database in the router D in advance.

[0026]

As described above, the service load distribution device in the network according to the present invention has the following effects.

(1) An apparatus for distributing the load of a service providing server in a network in which a service providing site in which a plurality of service providing servers of the same type are registered provides service information in response to a request from a terminal. A load distribution processing unit for detecting a load status of the service providing server; and a database for storing each IP address of the service providing server in association with a domain name of the service providing site. IP address notifying means for notifying the terminal of the IP address of the lighter service providing server based on the load status of each service providing server detected by the load distribution processing unit when the providing request is received. , So that the load is not biased to any of the service providing servers, It is possible to distribute the load of the providing server. Therefore, the service information can be efficiently provided to the terminal.

(2) The load distribution processing unit and the IP address notifying means are provided on the router to which each service providing server is connected, and when the connection of the service providing server to the router is detected, each service providing server is automatically notified. IP address assigning means for notifying the IP address to IP address notifying means after the IP address is assigned
Since the P address notifying means registers the IP address notified from the IP address allocating means in the database, it is not necessary to allocate the IP address to the service providing server in advance. Therefore, the operation of manually registering the IP address in the database can be omitted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a network to which an embodiment of the present invention is applied.

[Explanation of symbols]

 A: Small-scale network B: Web site (service providing site) b1, b2: Web server (service providing server) C: Router c1: DNS processing unit D: Router (service load balancing device) d1 ... DNS processing unit (IP address notifying means) d2 ... DHCP processing unit (IP address allocating means) d3 ... Load distribution processing unit X, Y, Z ... terminals

Claims (2)

[Claims] 1. A service providing server of the same kind (b1, b2)
Is a device for distributing the load on the service providing server in a network in which a plurality of registered service providing sites (B) provide service information in response to requests from terminals (X, Y, Z). A load distribution processing unit (d3) for detecting the load status of the service providing server, and a database for storing each IP address of the service providing server in association with the domain name of the service providing site, and specifying a domain name from a terminal to provide a service. When the information provision request is received, based on the load status of each service providing server detected by the load distribution processing unit,
IP address notifying means (d for notifying the terminal of the IP address of the service providing server (b1) with the lighter load
1) A service load distribution device in a network, comprising: 2. A service distribution server, wherein a load distribution processing unit and an IP address notifying means are provided on a router (D) to which each service providing server is connected, and when the connection of the service providing server to the router is detected. After automatically assigning an IP address to the IP address notifying unit, the IP address notifying unit is provided with an IP address notifying unit (d2) for notifying the IP address to the IP address notifying unit. 2. The service load distribution apparatus in a network according to claim 1, wherein the apparatus is registered in the database.