This was a fast response, and doesn’t cover the whole scope of handling networking in docker. As mentioned elsewhere there is a different network philosophy for Standalone Containers & Overlay networking.

You declare the ip in your setup, or in the yaml file. An example for the docker-compose file is in the link below. I’d expect you’ll want to declare the network and such as well, if you’re not familiar.

https://gist.github.com/natcl/3d881d00a56c8a961e6dab8ba51a5a37