When to use --hostname in docker?

Question

Is --hostname like a domain name system in docker container environment that can replace --ip when referring to other container?

Answer 1

If you need to change the hostname in a way that other containers from the same network will see it, just use --net-alias=${MY_NEW_DNS_NAME}

For example:

docker run -d --net-alias=${MY_NEW_DNS_NAME} --net=my-test-env --name=my-docker-name-test 

Please see: Difference between --link and --alias in overlay docker network?