centos7 - How to edit /etc/hosts file in running docker container

Question

I am working on an application which requires some configuration to be stored in /etc/hosts file of a docker container. I have tried it with many options but did not find any correct way of modifying the /etc/hosts file at run time.

I want to do it either by Dockerfile or by java code. I am able to build the docker image and modify the /etc/hosts files manually, but unfortunately that is not our projects requirement.

Answer 1

Depends upon what sort of modifications you want to do. If you just need to add more hosts, you can probably do it within docker run command like -

docker run --add-host="localA:127.0.0.1" --add-host="localB:172.0.0.1" ....

This link might be useful as well :- https://github.com/docker/docker/issues/10324