https://www.cnblogs.com/XJJD/p/10308840.html
https://www.cnblogs.com/1214804270hacker/p/9325150.html
https://www.cnblogs.com/1214804270hacker/p/9299462.html
nginx集群搭建
原文：https://www.cnblogs.com/BoKe-LY/p/11904442.html
