数据中心灾难恢复：处理分布式应用故障.pptVIP

64 ? 2005 Cisco Systems, Inc. All rights reserved. Cisco Confidential DC-2106 设计 1: DNS和HTTP Location Cookie GSS Data Center 2 VIP: 5 ? 1, 2—Clients makes initial DNS request and the GSS resolves it to Data Center 1 ? 3—Client accesses Data Center 1, cookie= site1 is inserted to the HTTP header ? 4, 5—Client rerequires for the same application midsession, with a different D-proxy IP, and the GSS resolves it to Data Center 2 ? 6—Client now sends traffic to Data Center 2, with cookie-site1 in the HTTP header ? 7—CSS at Data Center 2 either reroute the user traffic directly back to Data Center 1 CSS, or sends a 302 redirect to the client, due to cookie!=site2 7 3 6 2, 5 1, 4 Client’s D-Proxy Server Farm CSS-B CSS-A Data Center 1 www1 www3 CSS-B CSS-A www0 65 ? 2005 Cisco Systems, Inc. All rights reserved. Cisco Confidential DC-2106 设计1: 考虑和注意事项 ? Requires SSL termination for HTTPS applications ? 302 redirect requires site-specific DNS configuration and alerting users of book marking ? Redirect does not work with HTTP post operations ? CSS direct reroute performs better with high-speed direct line between data centers ? Works only for HTTP or HTTPS protocols Site Stickiness Achieved! 10.45.248.x 10.46.248.x Redistribute RHI RHI BG BG 4.24 (AS 3) IG P 66 ? 2005 Cisco Systems, Inc. All rights reserved. Cisco Confidential DC-2106 设计2: 智能的全球服务器负载均衡 RHI, BGP/IGP E-BGP E-BGP E-BGP ISP1 (AS 1) ISP2 (AS 2) Internet E-BGP 30.30.30.x 10.4 8.x P P /24 7200SecEdge To Internal Network (IGP) Secondary Data Center MSFC CSM /24 7200PriEdge (AS 3) IGP To Internal Network (IGP) Primary Data Center MSFC CSM IGP (OSPF) 10.41.248.x Enterprise Edge Router GSS 67 ? 2005 Cisco Systems, Inc. All rights reserved. Cisco Confidential DC-2106 MSFC router ospf 1 log-adjacency-changes redistribute static metric-type 1 subnets route-map REMOTE-APP network 55 area 0 net