Information about Docker suggests running docker commands with sudo, but I would prefer to use docker as my regular user.
Supposedly this is a documented topic, but I did not look hard enough to locate those details. Either way, it is pretty easy to do.
For an unpriviledged user..
Ensure the user is in the docker group
% usermod -G docker <user>
Restart the docker service
% service restart docker
Test with id
If you have not logged out, id will not include the docker group:
% id
uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),109(lpadmin),124(sambashare)
Forcing the login, we will see this change:
% su -l user
Password:
% id
uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),109(lpadmin),124(sambashare),999(docker)
docker run should work!
% docker run -i -t ubuntu /bin/bash
Unable to find image 'ubuntu' locally
ubuntu:latest: The image you are pulling has been verified
511136ea3c5a: Pull complete
5bc37dc2dfba: Pull complete
61cb619d86bc: Pull complete
3f45ca85fedc: Pull complete
78e82ee876a2: Pull complete
dc07507cef42: Pull complete
86ce37374f40: Pull complete
Status: Downloaded newer image for ubuntu:latest
root@a91029463b28:/#