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

--hostname is a parameter which can be given along with docker run command which will set the specified name as containers hostname whereas --ip is parameter to set specific ip address(ipv4) to that particular container.

docker run --hostname test --ip 10.1.2.3 ubuntu:14.04 

The following command will create a docker container with base image as ubuntu-14.04 with hostname as test and container ip address as 10.1.2.3