When to use --hostname in docker?

Question

Does --hostname act as a domain name system? When referring to other containers can it replace --ip?  

Answer 1

This flag, --hostname is used to change the host name of you container, its used when you run your container. 

Example :

$ docker run --hostname demo nginx

 This does not change the container's DNS outside docker and it also does  not provide any network isolation, so you cannot connect to the container using the hostname.

Where as the --ip flag is used to assign a specific ip to your container .

Example :

$ docker run --ip 10.0.0.2 nginx

Hope this helped :)

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