How to deal with container ports in docker?

Question

Network administration

How to deal with container ports in docker? For example, I have 3 users who fill out forms on the test.com page. The form data should be sent to the container I created. And under each user the container is created.
This works with one user and one container. I send the form to the container on test.com:8080/form (I specified port 8080 when creating the container) and everything works. But docker does not create a container for the second user, since this port is occupied by the first container. How can I properly solve this problem?

Answer 1

In fact, roughly speaking, there are container ports (each of them has 65535 of them) and ports of your host machine (where containers are spinning), there are also 65535 of them. And if 1 port of some container is linked to the port of the host machine, this port of the host machine is already can't be busy. For example, if you have two mysql containers and inside they open 3306 ports, then only one of them can link to port 3306 of the host machine, the second one will say "I'm tired, I'm leaving."