'How do I open another port in a docker nginx container (only in the container; so, NOT publishing which is the -p flag)?
On my local laptop.
I'm learning about ports and Docker and am having problems using different ports in nginx. I would like to start an nginx container and specify a port, open the container shell, and test the web server with curl on the port I specified. In Docker, I've tried to use --expose <different_port_here> and also tried -e NGINX_PORT=<different_port_here> when creating the container but none of them worked. Only the default port 80 works.
Anybody know how I can open a different port within my container? I DON'T want to publish and forward the port outside the container.
Attempt 1
The first thing I tried was to use --expose <different_port_here>
docker run --name my-nginx-container-w-expose -d --expose 100 nginx:stable-perl
When I do docker ps it shows port 100/tcp and 80/tcp so I thought that port 100 would also be open now.
Then I go into the shell and try curl with the following commands
docker exec -it my-nginx-container-w-expose /bin/bash
curl http://localhost:<different_port_here>
Return the following below:
curl: (7) Failed to connect to localhost port 100: Connection refused
Attempt 2
The 2nd thing I tried was to use -e NGINX_PORT=<different_port_here>
docker run --name my-nginx-container-w-env-variable -d nginx:stable-perl
When I do docker ps it does NOT shows port 100/tcp but shows 80/tcp.
Then I go into the shell and try curl with the following commands
docker exec -it my-nginx-container-w-env-variable /bin/bash
curl http://localhost:<different_port_here>
curl: (7) Failed to connect to localhost port 100: Connection refused
The only port I can use is 80
The only port which curl works with when in the container is 80.
curl http://localhost:80
Return
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
Sources
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Source: Stack Overflow
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