问题

no live upstreams while connecting to upstream client

        proxy_pass    http://localhost:5001 -> http://127.0.0.1:5001;

• no live upstreams while connecting to upstream client?

nginx 访问资源 403

https://stackoverflow.com/questions/25774999/nginx-stat-failed-13-permission-denied

从两个点查找：

1. nginx 运行用户是否 root 或有权限的用户
   1. ps aux | grep nginx 可以查看
2. selinux 是什么模式运行？
   1. 修改 sudo nano /etc/selinux/config -> SELINUX=permissive，成宽松模式