nginx.conf does not obey environmental variables

[mabelrxu]

tubesync/config/root/etc/nginx/nginx.conf

Line 133 in 33479e8

proxy_pass http://127.0.0.1:8080;

even when I have LISTEN_HOST and LISTEN_PORT set to 0.0.0.0:4849 GET requests continue to go to 127.0.0.1:8080

2026/04/09 00:30:50 [error] 210#210: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.16.2.11, server: _, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8080/", host: "tubesync.docker.internal"
172.16.2.11 - - [09/Apr/2026:00:30:50 -0400] "GET / HTTP/1.1" 502 556 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36"
2026/04/09 00:30:50 [error] 210#210: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.16.2.11, server: _, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8080/favicon.ico", host: "tubesync.docker.internal", referrer: "http://tubesync.docker.internal/"
172.16.2.11 - - [09/Apr/2026:00:30:50 -0400] "GET /favicon.ico HTTP/1.1" 502 556 "http://tubesync.docker.internal/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36"

[meeb]

LISTEN_HOST and LISTEN_PORT set the listening host and port for the gunicorn application server, not nginx. Setting LISTEN_HOST and LISTEN_PORT allows you to use your own upstream HTTP ingress service to bypass the bundled nginx server.

tubesync/tubesync/tubesync/gunicorn.py

Lines 19 to 24 in 33479e8

	def get_bind():
	host = os.getenv('LISTEN_HOST', '127.0.0.1')
	port = os.getenv('LISTEN_PORT', '8080')
	return '{}:{}'.format(host, port)

This is clearly stated in the readme.

[tcely]

Also, the wiki covers those variables.

I'm happy to review suggested changes to add further explanation to the wiki.

[mabelrxu]

in that case, how do I edit the bind of nginx.conf so that it goes to a different port? I have this container and a different one both trying to use port 8080 and they are causing a collision when I then use caddy to reverse-proxy.

follow up question: why does the container -p 4848 but nowhere in the container can I find anything bound on port 4848?

[tcely]

in that case, how do I edit the bind of nginx.conf so that it goes to a different port? I have this container and a different one both trying to use port 8080 and they are causing a collision when I then use caddy to reverse-proxy.

Each container should have its own IP address, so using the same port isn't normally an issue.
To access gunicorn from another container without going through nginx you must change LISTEN_HOST. Otherwise, only a process on the same container can reach it because 127.0.0.1 is not routed.

follow up question: why does the container -p 4848 but nowhere in the container can I find anything bound on port 4848?

openresty / nginx is bound to port 4848.

tubesync/config/root/etc/nginx/nginx.conf

Lines 116 to 119 in 33479e8

	# Ports
	listen 4848;
	listen [::]:4848;

It's also worth understanding how docker proxies ports from the container to the docker host: https://docs.docker.com/reference/cli/docker/container/run/#publish