How to change the hostname of Ubuntu in docker?

Question

When using Ubuntu in docker , there is no way to modify the hostname; each time to connect to ubuntu, hostname is a random string ....

Answer 1

Docker run

If you are running the container using docker run , then you can use -h option as said by @callmemath

docker run -h custom.hostname -ti ubuntu bash

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Docker-compose

If you are running containers using docker-compose then you need to use hostname .

hostname: Any_name_you_like

Answer 2

Use -h option :

docker run -h custom.hostname -ti ubuntu bash
root@custom:/# hostname
custom.hostname

See docker run documentation for more details