搭建高可用负载均衡组件及缓存DNS
该项工作，如题所示，主要分为两部分：高可用负载均衡组件、缓存DNS。 高可用负载均衡组件 需求：优化业务系统架构中某些关键环节，针对TCP层数据流量进行负载均衡，并保证服务的高可用。 技术选型：HAProxy + Keepalived，这对组合比较常见成熟。 另外，由
该项工作，如题所示，主要分为两部分：高可用负载均衡组件、缓存DNS。
高可用负载均衡组件
需求：优化业务系统架构中某些关键环节，针对TCP层数据流量进行负载均衡，并保证服务的高可用。
技术选型：HAProxy + Keepalived，这对组合比较常见成熟。
另外，由于HAProxy的负载均衡任务可能比较多，靠人工修改配置来增删改任务不方便可靠，所以实现了一个简单的HAProxy管理系统， 以后经实际使用验证和完善会开放源码。
缓存DNS
先以www.qq.com为例，解释一下域名解析过程：
1. 用户向Local DNS发起www.qq.com.查询请求；
2. Local DNS向根服务器发起com.查询请求；
3. 根服务器向Local DNS返回com.解析记录；
4. Local DNS向com.权威服务器发起qq.com.查询请求；
5. com.权威服务器向Local DNS返回qq.com.解析记录；
6. Local DNS向qq.com.权威服务器发起www.qq.com.查询请求；
7. qq.com.权威服务器向Local DNS返回www.qq.com.解析记录；
8. Local DNS向用户返回www.qq.com解析记录。
Local DNS一般由网络运营商（如电信、网通等）提供。
缓存DNS处于用户端（这是一个相对的概念）与local DNS之间，利用DNS服务器软件的缓存功能以及缓存DNS与用户端的近距离特点来加速域名解析。
也可以在缓存DNS上按需求进行域名劫持。运营商为了牟利，也会在local DNS上进行域名劫持，这对于各大互联网公司对外提供的服务来说是个很大的问题。
在完成该工作后，我编写了一份安装配置文档，方便其他同事参考。文档见： HAProxy+HAProxyConsole+Keepalived+BIND安装配置文档.pdf。
原文地址：搭建高可用负载均衡组件及缓存DNS, 感谢原作者分享。
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