https://docs.docker.com/config/containers/container-networking/

Bridge

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- When you start Docker, a default bridge network (also called bridge) is created automatically, and newly-started containers connect to it unless otherwise specified. This is OBSOLETED. Should use custom bridge network

- Containers on the default bridge network can only access each other by IP addresses, unless you use the --link option, which is considered legacy. On a user-defined bridge network, containers can resolve each other by name or alias.

docker network create local
docker run -it --rm -v /mytmp:/mytmp --network local --name ansible ubuntu:hly    nc -l 8080docker run -it --rm -v /mytmp:/mytmp --network local ubuntu:hly    curl http://ansible:8080

Flow:

- Create custom bridge network

- When launch container specify --network to attach to that bridge

- Containers in the same bridge have DNS resolve and freely to connect to each other