How to organize joint work of docker containers?

Question

Docker

Tell me please. I have deployed the app in a container via docker compose. The task is to create several more containers with the same settings. When I run in another docker compos container, some apps don't deploy because they say the ports are already in use. I take the same image from the git. How to make the application run in other containers at the same time

Answer 1

You can leave the internal ports the same and change only the binding to the localhost. Localhost Port: Container Port
app1:
ports:
- '3001:3000'
app2:
ports:
- '3002:3000'

Answer 2

map to other ports or to another IP