Root password inside a Docker container

Question

I\'m using a Docker image which was built using the USER command to use a non-root user called dev. Inside a container, I\'m \"dev\", but I want to edit the

Answer 1

The password is 'ubuntu' for the 'ubuntu' user (at least in docker for ubuntu :14.04.03).

NB: 'ubuntu' is created after the startup of the container so, if you just do this:

 docker run -i -t --entrypoint /bin/bash  ubuntu     

You'll get the root prompt directly. From there you can force the password change of root, commit the container and optionally tag it (with -f) to ubuntu:latest like this:

root@ec384466fbbb:~# passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
root@ec384466fbbb:~# exit

% docker commit ec3844
5d3c03e7d6d861ce519fe33b184cd477b8ad03247ffe19b2a57d3f0992d71bca

docker tag -f 5d3c ubuntu:latest

You must rebuild your eventual dependencies on ubuntu:latest.