502 bad gateway: Nginx, gunicorn, Django - django

Question

Here is my nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log notice;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
include /etc/nginx/conf.d/*.conf;
server {
listen 80;
server_name 0.0.0.0;
location = /favicon.ico { access_log off; log_not_found off; }
location /static/ {
root /myproject;
}
location / {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://unix:/root/myproject/myproject.sock;
}
}
}
And my project have this structure:
This is my gunicorn.service file
[Unit]
Description=gunicorn daemon
Requires=gunicorn.socket
After=network.target
[Service]
User=root
Group=nginx
WorkingDirectory=/root/myproject/myproject
ExecStart=/root/myproject/myprojectenv/bin/gunicorn --access-logfile - --workers 3 --bind unix:/run/gunicorn.sock myproject.wsgi:application
[Install]
WantedBy=multi-user.target
error.log
2022/04/13 12:45:30 [crit] 20474#20474: *8 connect() to unix:/root/myproject/myproject.sock failed (2: No such file or directory) while connecting to upstream, client: 10.81.234.10, server: 0.0.0.0, request: "GET / HTTP/1.1", upstream: "http://unix:/root/myproject/myproject.sock:/", host: "10.10.89.8"
My gunicorn service is working properly and nginx.conf is also working properly with no errors.
All permissions have been granted to myproject directory
Still I am getting a 502 Bad Gateway error.
Please let me know if any additional information needed

Answer 1

The issue is you are creating the Socket file in different location and pointing the nginx to different location. Your socket file is created at
/run/gunicorn.sock as you can see from this command
ExecStart=/root/myproject/myprojectenv/bin/gunicorn --access-logfile - --workers 3 --bind unix:/run/gunicorn.sock myproject.wsgi:application
and referring to it in different location(/root/myproject/myproject.sock) in nginx configuration as you can
see here
proxy_pass http://unix:/root/myproject/myproject.sock;
You can solve this in 2 ways
by changing gunicorn conf from
ExecStart=/root/myproject/myprojectenv/bin/gunicorn --access-logfile - --workers 3 --bind unix:/run/gunicorn.sock myproject.wsgi:application
to
ExecStart=/root/myproject/myprojectenv/bin/gunicorn --access-logfile - --workers 3 --bind unix:/root/myproject/myproject.sock myproject.wsgi:application
By changing nginx conf from
proxy_pass http://unix:/root/myproject/myproject.sock;
to
proxy_pass http://unix:/run/gunicorn.sock;
I recommend using the first approach
Restart both gunicorn and nginx after these changes