如何解决Gunicorn + Nginx 502 Bad Gateway上的Flask应用
我对使用nxginx和gunicorn的烧瓶应用程序的依赖有问题。当我检查nginx状态时，看起来还可以：
add_action( 'woocommerce_checkout_shipping',array( new WC_Checkout,'checkout_form_shipping' ),10 );独角兽也不错：
● 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.
但是，当我尝试通过浏览器访问flask应用程序时，我有● 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.
，并且在502 Bad Gateway中看到以下内容（其中.151是我要在其上提供应用程序的服务器，而.151是服务器。 178是我的桌面）：
/var/log/nginx/error.log在项目目录中，我可以看到该套接字文件存在，所以很奇怪。
有趣的是，当我通过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,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,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,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,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,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,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,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,referrer: "http://192.168.0.151/"
和sudo systemctl stop gunicorn停止nginx和gunicorn并运行sudo systemctl stop nginx时，我的应用程序仍然可以运行并且可以从桌面访问，但它每20秒会重新启动一次
独角兽配置：
gunicorn --bind 192.168.0.151 -w 5 wsgi:appNginx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
wsgi.py
server {
listen 80;
server_name 192.168.0.151;
location / {
include proxy_params;
proxy_pass http://unix:/home/pi/Peephole/peephole.sock;
}
}
不知道这是否重要，但是我的服务器是raspberry pi 4b 4gb。
解决方法
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
然后在nginx配置中，通过HTTP而不是套接字传递给它：
proxy_pass http://localhost:8000/
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