Docker EXPOSE. Can't get it

Question

this past two day I\'m having trouble with docker and i can get it. Following to the docker doc you can expose the ports on which a container will listen for connections wi

Answer 1

In your nodejs app, you have the instruction app.listen(PORT); which tells nodejs to start a server listening for connections on the loopback interface on port PORT. As a result your app will only by able to see connections originating from localhost (the container itself).

You need to tell your app to listen on all interfaces on port PORT:

app.listen(PORT, "0.0.0.0");

This way it will see the connections originating from outside your Docker container.