How to add user of jenkins container(jenkins) in group(users) inside container itself?

Question

When I access my container:

jenkins@bc145b8cfc1d:/$ docker ps

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

jenkins@bc145b8cfc1d:/$ whoami
jenkins

jenkins@9cdb24cf71f2:/$ usermod -G users jenkins
ERROR : usermod: Permission denied.**

You're running these commands in a container? Is Docker in the container? Have you mounted the Docker socket? — johnharris85, Jan 10 '17 at 20:18
Jenkins is running in a container and docker is in host machine.we are trying to run docker commands from jenkins container and we have already mounted the docker socket. — Isha Gusai, Jan 11 '17 at 05:47
Possible duplicate of [How to mount docker socket as volume in docker container with correct group](http://stackoverflow.com/questions/36185035/how-to-mount-docker-socket-as-volume-in-docker-container-with-correct-group) — eawenden, Jan 11 '17 at 14:10

score 1 · Answer 1 · edited Jan 11 '17 at 13:30

You can execute a bash command inside a container as a different user. In this case you can run from your host:

docker exec -it --user root <container id> usermod -G users jenkins

or you can enter the container interactively and execute any commands as root as follows:

docker exec -it --user root <container id> bash

and then:

root@9cdb24cf71f2:/$ usermod -G users jenkins

Note: The solution above assumes that the group users exists.

1 Answers1