Running Multiple Instances of the Same Project in the same Docker Environment

[danniarreza]

Hi, I'm trying to do as the title suggests. So, same Mendix Project, runs in two containers that can be accessed through localhost:8080 & localhost:8081 for example.

What I did was (1) specifying the $PORT variable in the Dockerfile to receive a value from the docker build command so then I can specify the different ports, and then (2) docker build twice to have two images with different ports. Building the images was a success, of course, but when I docker run the second image, it says this "Admin port '8082' is already in use", see below.

Is there a way to change this admin port from outside the project, as in, from either the Dockerfile or from the build-args parameter or anything?