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AssigneeNone recorded
InventorsTatsuya Watanuki, Kazuo Sugai, Naoya Ikeda, Yoshifumi Atarashi, Hidemitsu Higuchi
Estimating the term…
A system includes at least two servers for executing the same application protocol among a plurality of servers, load balancing apparatus respectively connected to the servers, and a router connected to these load balancing apparatuses and to a network. Receiving an access packet from the network, the router selects and routes an arbitrary load balancing apparatus. Receiving the access packet, each load balancing apparatus selects an arbitrary server and transmits the access packet.
A load balancing system for distributing access packets to a plurality of servers prepared for at least one kind of application protocol, comprising:
A load balancing system for distributing access packets to a plurality of servers prepared for at least one kind of application protocol, comprising:
A load balancing method in a load balancing system including a plurality of load balancing apparatuses connected to at least two Web servers for executing the same application protocol among a plurality of Web servers prepared for each of at least one kind of application protocol and distributing access packets to said plurality of Web servers, and a router connected to said plurality of load balancing apparatuses and routing the access packet received through a network to each of said load balancing apparatuses, said router executing at least the following steps:
Dependencies are inferred from the claim text.
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Address processing for routing: address table lookup; Address filtering
Translation of Internet protocol [IP] addresses: maintenance or indexing of mapping tables
In which an application is distributed across nodes in the network: for accessing one among a plurality of replicated servers
Server selection for load balancing: based on the content of a request
Term end not estimated
This invention relates to a load balancing system. More particularly, the invention relates to a system capable of distributing traffics to a plurality of Web servers provided to an information service site connected to the Internet.
A wide variety of Internet information services such as EC (Electronic Commerce) have been rapidly increasing in recent years. The phenomena in which traffics to Web servers installed at a specific site providing the information service abruptly increase have often occurred. On the other hand, services having a higher speed and higher reliability have been required for business concerns that provide data centers and ASP (Application Service Providers).
These sites generally use a router for connection with the Internet. A Web system at the site includes load balancing apparatuses connected to the router and a plurality of Web servers connected to the load balancing apparatuses. Large quantities of traffics (access packets) from outside are once collected to the router in such a Web system. To secure reliability and stability of the system, the router must be able to distribute the traffics to a plurality of Web servers.
FIG. 1 shows a construction of a Web system 10 according to an embodiment of the invention;
FIG. 2 shows a construction of a policy routing table;
FIG. 3 shows a construction of a hash table “#1”;
Embodiments of the invention will be hereinafter explained in detail with reference to the drawings.
FIG. 1 shows a construction of a Web system that constitutes an information service site according to an embodiment of the invention.
A plurality of client apparatuses 11a to 11d using PC (Personal Computers), etc, for receiving information services and a Web system 10 of a site providing the information services are connected to one another through a network such as the Internet 12. The Web system 10 includes a router 13 connected to the Internet 12 and load balancing apparatuses A14, B15, C16 and D17 for distributing traffics (access packets) allocated by the router 13 to a plurality of Web servers. The load balancing apparatus A14 and B15 execute ordinary HTTP and are connected to the Web servers 18a to 18d responding to HTTP packets from the client apparatuses. The load balancing apparatuses C16 and D17 execute HTTPS and are connected to the Web servers 19a to 19d responding to HTTPS packets. Generally, the Web servers 18a to 18d and 19a to 19d are so constituted as to provide the same information service. A virtual IP address “10.0.0.1” is allocated as the address representing all the Web servers 18a to 18d and the Web servers 19a to 19d. This virtual IP address “10.0.0.1” is set to all load balancing apparatuses A14, B15, C16 and D17. Each load balancing apparatus receives access packets containing the virtual IP address “10.0.0.1” as a destination address from the router 13 and distributes them to each Web server. The load balancing apparatus A14, B15, C16 and D17 respectively have their individual IP addresses, that is, “50.0.0.1”, “60.0.0.1”, “70.0. 0.1” and “80.0.0.1”.