F5 GTM 解决方案介绍 Traffic Management Basics Within the Data Center To the Data Center ISP A ISP B Data Center to Data Center 异地容灾中常见的应用与网络恢复技术 按预案手工实现站点接管(Tier3/4) 手动修改客户端访问目的地址(缺点:切换慢、维护工作量大) 手动修改DNS解析记录方式(缺点:错误设置DNS启示录的后故是相当严重的) 通过事先写好的脚本实现自动的热接管(Tier5) 应用层重定向(缺点:时间长、扩展性差) 通过广域网流量管理方案提供永不停顿的系统运行能力(Tier6) Getting Users to the Best Available Data Center Router L-DNS BIG-IP GTM BIG-IP LTM Corporate Servers Site 1 (Primary) Client Router BIG-IP LTM Corporate Servers Site 2 (Back up) BIG-IP GTM 主要功能与特性:应用智能、可管理性与高性能 感知应用,及时发现灾难 自动切换,通知用户改变数据访问点 F5 BIG-IP GTM (Global Traffic Manager) 支持流量在数据中心的动态负载均衡 解决关联应用在多数据中心的协同问题 灵活的规则定义--iRules 支持IPV6应用 图形界面的DNS管理工具 TMOS 全球领先的广域网流量管理方案 异地容灾自动恢复的最佳选择 BIG-IP GTM将故障切换的时间缩短到几十秒钟!!! User wants to browse get_host_by_name() called by browser, which causes DNS query to Local DNS (LDNS) Local DNS recurses: Ask Root for , get back NS record for .com Ask .com for , get back NS record for . Ask for , get back A record Return A record to puter User’puter Stores A record in memory get_host_by_name() returns the address of browser Browser opens connection to address:80 and does a GET / Web page response 标准DNS解析流程 Public Root DNS Server (one of 16 from )
Web Server in Timbuktu .com DNS Server DNS Server Local DNS A Record for ? Go ask .com A Record for ? Go ask A Record for ?
A Record for ?
Tip: GTM operates here, as an intelligent DNS, monitoring multiple redundant resources and distributing traffic to them GTM WIP .com Pool
User wants to browse Users PC queries to Local DNS (LDNS) Local DNS recurses: Ask Root for , Ask .com for Ask for AME record Root for .com Ask .com for .com Ask GTM for .com GTM receives DNS query on its Listener Checks to see if .com matches a Wide IP definition Checks for persistence records Checks the Wide IP pool for the most available virtual server Returns the IP a
