it should only be a personal state of the art preview thing. a complete ci/cd would may be a overkill

Update: i solved the problem by using hostnames, inside the nginx container you can use the name of the other container as hostname and it will be resolved automatically

they are all connected to a internal docker network. The ip only matters to my nginx container, which is the only container connected through port bindings. I run on creation something like this: docker run -d --network nginx-bridge --ip 172.172.0.140 ---name main node:latest /project/startup.sh but portainer calls on recreation this: docker run -d --network nginx-bridge ---name main node:latest /project/startup.sh

Are they legal to use? Or ist it just a problem if u host it public on the Internet?

Sounds like brainfuck with some extra arithmetic operations, but are there better loops?