CONTENTS DELIVERY SYSTEM AND METHOD USING OBJECT REDIRECTION, AND GSLB SWITCH THEREOF

• US 20100042681A1
• Filed: 08/12/2009
• Published: 02/18/2010
• Est. Priority Date: 08/13/2008
• Status: Active Grant

• Current Assignee: SK Planet Co., Ltd. (SK Telecom Co., Ltd.)
• Original Assignee: SK Telecom Co., Ltd.
• Inventors: JEON, Jae Sic, KIM, Kyong Hwan
• Granted Patent: US 8,316,085 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/1021 based on client or server locations
• CPC Class Codes: H04L 67/1034 Reaction to server failures by a load balancer

Abstract

A contents delivery system and method using object redirection, and a GSLB switch thereof are provided. When a client requests a web server to provide a page embedded object, the web server embeds the URL representing the position of the object in an HTTP 302 redirection message and transmits the HTTP 302 redirection message including the URL to the client. A GSLB switch corresponding to the URL transmits the IP address of a specific host server selected from at least one host server storing the object to the client. Accordingly, load of the web server decreases and flexibility in change of a CDN solution is secured.

Claims

1. A contents delivery system using object redirection comprising:

at least one host server receiving and storing an object embedded in a page;

a web server storing the page and the object, transmitting the object to the at least one host server such that the at least one host server stores the object, transmitting the page to a client at the request of the client, embedding the URL representing the position of the object stored in the at least one host server in an HTTP 302 redirection message and transmitting the HTTP 302 redirection message including the URL to the client when the client requests the web server to provide the object; and

a GSLB switch corresponding to the URL and transmitting the IP address of a specific host server which will transmit the object, selected from the at least one host server, to the client receiving the message through a local DNS server at the client when receiving inquiry of the local DNS server about the IP address of the host server storing the object.

2. The contents delivery system of claim 1, wherein the GSLB switch selects the specific host server which will transmit the object with reference to a host network map including position information of the at least one host server and object information stored in the at least one host server.

3. The contents delivery system of claim 2, wherein the position information of the least one host server includes the IP address of the at least one host server.

4. The contents delivery system of claim 3, wherein the GSLB switch selects the specific host server located in proximity to the client with reference to the IP address of the at least one host server and the IP address of the client.

5. The contents delivery system of claim 2, wherein the GSLB switch selects the specific host server in consideration of at least one of data traffic information of the at least one host server and fail-over information of the at least one host server.

6. A contents delivery method using object redirection, comprising:

a storing step in which at least one host server receives an object embedded in a page from a web server and stores the object;

a message transmitting step in which the web server embeds the URL representing the position of the object stored in the host server in an HTTP 302 redirection message and transmits the HTTP 302 redirection message including the URL to a client receiving the page when the client requests the web server to provide the object; and

an address transmitting step in which a GSLB switch corresponding to the URL transmits the IP address of a specific host server which will transmit the object, selected from the at least one host server, to the client receiving the message through a local DNS server at the client when receiving inquiry of the local DNS server about the IP address of the host server storing the object.

7. The contents delivery method of claim 6, wherein the GSLB switch transmits the IP address of the specific host server to the local DNS server in consideration of at least one of data traffic information of the at least one host server, fail-over information of the at least one host server, information on proximity of the client to the at least one host server and object information stored in the at least one host server in the address transmitting step.

8. The contents delivery method of claim 6, wherein the GSLB switch transmits the IP address of another GSLG switch to the local DNS server and the other GSLB switch receives inquiry of the local DNS server about the IP address of the specific host server storing the object from the local DNS server and transmits the IP address of the specific host server to the client in the address transmitting step.

9. The contents delivery method of claim 8, wherein the GSLB switch transmits the IP address of the other GSLB switch among a plurality of GSLB switches to the local DNS server with reference to fail-over information of the plurality of GSLB switches in the address transmitting step.

10. A GSLB switch comprising:

a transmitting/receiving unit transmitting/receiving data;

a host network map database storing a host network map including position information of at least on host server and object information stored in the at least one host server; and

a controller receiving the position information of the at least one host server and the object information stored in the at least one host server through the transmitting/receiving unit to update the host network map, selecting a specific host server which will transmit the object from the at least one host server with reference to the host network map and transmitting the IP address of the specific host server to a client through a local DNS server at the client via the transmitting/receiving unit when receiving inquiry of the local DNS server about the IP address of the host server storing the object from the local DNS server through the transmitting/receiving unit.

11. The GSLB switch of claim 10, wherein the position information of the at least one host server includes the IP address of the at least one host server.

12. The GSLB switch of claim 11, wherein the controller selects the specific host server located in proximity to the client with reference to the IP address of the at least one host server and the IP address of the client.

13. The GSLB switch of claim 10, further comprising an information collecting module collecting at least one of data traffic information of the at least one host server and fail-over information of the at least one host server through the transmitting/receiving unit.

14. The GSLB switch of claim 13, wherein the information collecting module further collects fail-over information of a plurality of GSLB switches.

15. The GSLB switch of claim 13, wherein the information collecting module collects the information by transmitting/receiving messages to/from the at least one host server or the plurality of GSLB switches at predetermined periods.

16. The GSLB switch of claim 13, wherein the information collecting module collects the fail-over information when data traffic is relatively small in consideration of data traffic of the at least one host server or the plurality of GSLB switches.

17. The GSLB switch of claim 13, wherein the controller transmits the IP address of the specific host server with reference to the information collected by the information collecting module when receiving the inquiry of the local DNS server about the IP address.

18. The GSLB switch of claim 14, wherein the controller transmits the IP address of a GSLB switch other than the GSLB switch among the plurality of GSLB switches with reference to the information collected by the information collecting module when receiving the inquiry of the local DNS server about the IP address.

19. The GSLB switch of claim 13, wherein the information collecting module stores the collected information in the host network map.

20. The GSLB switch of claim 14, wherein the information collecting module collects the information by transmitting/receiving messages to/from the at least one host server or the plurality of GSLB switches at predetermined periods.

21. The GSLB switch of claim 14, wherein the information collecting module collects the fail-over information when data traffic is relatively small in consideration of data traffic of the at least one host server or the plurality of GSLB switches.