Gunicorn + nginx 502 错误网关上的 Flask 应用程序
[英]Flask app on Gunicorn + nginx 502 Bad Gateway
问题描述
I have a problem with deply of my flask app using nxginx and gunicorn.
我在使用 nxginx 和 gunicorn 部署我的烧瓶应用程序时遇到问题。 When I am checking nginx status it looks ok:当我检查 nginx 状态时，它看起来没问题：
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2020-08-25 20:10:46 CEST; 2s ago
Docs: man:nginx(8)
Process: 2847 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Process: 2848 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Main PID: 2849 (nginx)
Tasks: 5 (limit: 4915)
Memory: 8.7M
CGroup: /system.slice/nginx.service
├─2849 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
├─2850 nginx: worker process
├─2851 nginx: worker process
├─2852 nginx: worker process
└─2853 nginx: worker process
sie 25 20:10:46 raspberrypi systemd[1]: Starting A high performance web server and a reverse proxy server...
sie 25 20:10:46 raspberrypi systemd[1]: Started A high performance web server and a reverse proxy server.
Gunicorn also looks fine: Gunicorn 看起来也不错：
● gunicorn.service - Gunicorn instance to serve peephole
Loaded: loaded (/etc/systemd/system/gunicorn.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2020-08-25 20:12:11 CEST; 1s ago
Main PID: 3017 (gunicorn)
Tasks: 1 (limit: 4915)
Memory: 39.4M
CGroup: /system.slice/gunicorn.service
└─3017 /home/pi/Documents/Peephole/venv/bin/python /home/pi/Documents/Peephole/venv/bin/gunicorn --preload --workers 2 --tim
sie 25 20:12:11 raspberrypi systemd[1]: Started Gunicorn instance to serve peephole.
However when I am trying to access flask app via browser then I have 502 Bad Gateway and in /var/log/nginx/error.log is see the following (where .151 is server on which I am trying to deply app, and .178 is my desktop):但是，当我尝试通过浏览器访问 Flask 应用程序时，我有502 Bad Gateway并且在/var/log/nginx/error.log中看到以下内容（其中 .151 是我尝试部署应用程序的服务器，并且 . 178是我的桌面）：
2020/08/25 18:51:53 [crit] 530#530: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET / HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/", host: "192.168.0.151"
2020/08/25 18:51:54 [crit] 530#530: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/favicon.ico", host: "192.168.0.151", referrer: "http://192.168.0.151/"
2020/08/25 18:52:05 [crit] 530#530: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/favicon.ico", host: "192.168.0.151", referrer: "http://192.168.0.151/"
2020/08/25 19:00:20 [crit] 1299#1299: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET / HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/", host: "192.168.0.151"
2020/08/25 19:00:22 [crit] 1299#1299: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/favicon.ico", host: "192.168.0.151", referrer: "http://192.168.0.151/"
2020/08/25 19:48:32 [crit] 1300#1300: *6 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET / HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/", host: "192.168.0.151"
2020/08/25 19:48:38 [crit] 1300#1300: *6 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/favicon.ico", host: "192.168.0.151", referrer: "http://192.168.0.151/"
2020/08/25 20:12:29 [crit] 2850#2850: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET / HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/", host: "192.168.0.151"
2020/08/25 20:12:29 [crit] 2850#2850: *1 connect() to unix:/home/pi/Peephole/peephole.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.0.178, server: 192.168.0.151, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/pi/Peephole/peephole.sock:/favicon.ico", host: "192.168.0.151", referrer: "http://192.168.0.151/"
In project directory I can see that socket file exists, so its weird.在项目目录中，我可以看到套接字文件存在，所以很奇怪。
Also what's interesting, when I am stopping nginx and gunicorn via sudo systemctl stop gunicorn and sudo systemctl stop nginx and running gunicorn --bind 192.168.0.151 -w 5 wsgi:app my app is alive and possible to reach from desktop but it keeps restarting every 20 seconds.还有什么有趣的，当我通过sudo systemctl stop gunicorn和sudo systemctl stop nginx and running gunicorn --bind 192.168.0.151 -w 5 wsgi:app sudo systemctl stop nginx和gunicorn --bind 192.168.0.151 -w 5 wsgi:app我的应用程序还活着，可以从桌面访问，但它一直在重新启动每 20 秒。
Gunicorn configuration:独角兽配置：
[Unit]
Description=Gunicorn instance to serve peephole
After=network.target
[Service]
User=pi
Group=www-data
WorkingDirectory=/home/pi/Documents/Peephole
Environment="PATH=/home/pi/Peephole/venv/bin"
ExecStart=/home/pi/Documents/Peephole/venv/bin/gunicorn --preload --workers 2 --timeout 120 --bind unix:peephole.sock -m 007 wsgi:app
[Install]
WantedBy=multi-user.target
Nginx configuration: nginx配置：
server {
listen 80;
server_name 192.168.0.151;
location / {
include proxy_params;
proxy_pass http://unix:/home/pi/Peephole/peephole.sock;
}
}
wsgi.py wsgi.py
from server import create_app
app = create_app()
Dont know if this is important but raspberry pi 4b 4gb is my server.不知道这是否重要，但 raspberry pi 4b 4gb 是我的服务器。
1 个解决方案
解决方案1
0 2020-08-25 18:42:45
On the ExecStart line in your supervisor file, try telling gunicorn to bind to all interfaces:在主管文件的ExecStart行上，尝试告诉 gunicorn 绑定到所有接口：
--bind 0.0.0.0:8000
Then in the nginx config, pass to this via HTTP instead of socket:然后在 nginx 配置中，通过 HTTP 而不是套接字传递给这个：
proxy_pass http://localhost:8000/
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