Why is NGINX giving 504 gateway timeout error? - nginx

Question

My NGINX conf is-
server {
listen 80;
server_name site.com ;
location / {
include proxy_params;
proxy_pass http://0.0.0.0:8000;
}
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/site.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/site.com/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
I am running a Flask app on Gunicorn on Port 8000. When I try to access my site, I get a 504 Gateway Time-out nginx/1.14.0 (Ubuntu).
In the error.log , it says-
upstream timed out (110: Connection timed out) while connecting to upstream, client:myip server: site.com, request: "GET / HTTP/1.1", upstream: "http://0.0.0.0:8000/", host: "mysite.com"

Answer 1

You have some errors in your config.
You cannot have one server who is listening on multiple ports.
You should not write 0.0.0.0:8000, but try 127.0.0.1:8000 instead
Also I dont understand why you include proxy params, just delete that line.
Here is an example of what you could do.
server {
server_name site.com www.site.com;
location / {
proxy_pass http://127.0.0.1:8000/;
}
listen [::]:443 ssl; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/site.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/site.com/privkey.pem;
include /etc/letsencrypt/options-ssl-nginx.conf;
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
}
server {
if ($host = www.site.com) {
return 301 https://$host$request_uri;
}
if ($host = site.com) {
return 301 https://$host$request_uri;
}
listen 80;
listen [::]:80;
server_name site.com www.site.com;
return 404;
}
Good Luck :-)

Answer 2

Suggest to keep like below values, which could resolve the timeout issue.
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;