Gunicorn +Nginx 搭建服务，出现 502 Bad Gateway

Question

我想要在自己的服务器部署一个 httpbin 服务，用的是 Gunicorn + Nginx，但在设置 Nginx 代理这一步上一直没成功，提示 502 Bad Gateway，请问可能是哪里出错？

配置基本信息：

Ubuntu: 16.04.2
Nginx: 1.11.8
Gunicorn: 19.7.1

nginx配置

  1 server {
  2     listen 80;
  3     server_name mydomain.com;
  4     access_log  /home/ubuntu/access.log  main;                                                                                      
  5     location / {
  6         proxy_pass http://unix:/tmp/gunicorn/socket;
  7         proxy_set_header Host $host;
  8         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  9     }
 10 }   

gunicorn.service

  1 [Unit]
  2 Description=gunicorn daemon
  3 Requires=gunicorn.socket
  4 After=network.target
  5  
  6 [Service]
  7 PIDFile=/tmp/gunicorn/pid
  8 WorkingDirectory=/home/ubuntu/www                                                                                                   
  9 Restart=on-failure
 10 ExecStart=/usr/local/bin/gunicorn --pid /tmp/gunicorn/pid   \
 11           --bind unix:/tmp/gunicorn/socket httpbin:app
 12 ExecReload=/bin/kill -s HUP $MAINPID
 13 ExecStop=/bin/kill -s TERM $MAINPID
 14  
 15 [Install]
 16 WantedBy=multi-user.target

gunicorn.socket

  1 [Unit]
  2 Description=gunicorn socket
  3  
  4 [Socket]
  5 ListenStream=/tmp/gunicorn/socket
  6  
  7 [Install]
  8 WantedBy=sockets.target 

设置完成后，通过 curl 访问 socket 可以得到正确的网页，但 Nginx 代理不成功。

nginx错误日志

2017/03/30 22:45:49 [crit] 11460#0: *58 connect() to unix:/tmp/gunicorn/socket failed (2: No such file or directory) while connecting to upstream, client: my_ip_address, server: mydomain.com, request: "GET / HTTP/1.1", upstream: "http://unix:/tmp/gunicorn/socket:/", host: "mydomain.com"

Answer 1

502错误 说明你的Web应用本身有bug