Where do i find my docker services when launched by gitlab-ci

I have a docker-compose file launching gitlab-ce, gitlab runner and 2 personals services(webapp).
When i run docker-compose up locally, i can access my Service1 from localhost:48160 (since I have mapped this port with the exposed port).
Now i am trying to launch this docker compose file in a gitlab pipeline. The job pass, and i think that my job are created (screen of the passed job)1.
The fact is, when it run from gitlab, i don’t know of to access my service, because i can’t access it from localhost:48160 anymore. I’ve tryed to get the ip adress of the container but it results a strange ipadress (last line on the previous screen).
What am i missing ?

Source: StackOverflow