Nginx报upstream timed out错误

前两天给客户部署生产环境，客户提供的是windows服务，我们的系统是前后台分离的，前台使用nginx容器，我按正常思路部署好服务后，前台页面正常显示，但是前台连接后台时，时好时坏，经常连不到后台服务器，但是后台正常提供服务，经过简单分析，应该是nginx的问题。看了下nginx的日志，发现error.log果然有错误抛出。

2018/09/20 16:41:47 [error] 2280#4160: *15 upstream timed out (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1, request: "POST /*****/pc/sys/login HTTP/1.1", upstream: "http://[::1]:8080/*****/pc/sys/login", host: "localhost", referrer: "http://localhost/loginOld"
2018/09/20 16:44:09 [error] 2280#4160: *47 upstream timed out (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1, request: "POST /*****/pc/sys/login HTTP/1.1", upstream: "http://[::1]:8080/*****/pc/sys/login", host: "127.0.0.1", referrer: "http://127.0.0.1/loginOld"
2018/09/20 16:45:40 [error] 2280#4160: *51 upstream timed out (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 127.0.0.1, server: 127.0.0.1, request: "POST /*****/pc/sys/login HTTP/1.1", upstream: "http://[::1]:8080/*****/pc/sys/login", host: "127.0.0.1", referrer: "http://127.0.0.1/loginOld"

我把重点标红了，大家看到是不是很奇怪，地址里怎么会有[::1] 这样的地址呢，其实谜底在这里

现在ip地址有两种ipv4和ipv6，区别我就不讲了，大家可以问度娘，关键是现在很多操作系统默认使用IPV6了，如果是这样的话localhost就不好使了，他会被转换成http://[::1]:这种地址。查看nginx配置文件

把所有localhost改为127.0.0.1，完美解决问题

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