Root password inside a Docker container

Solution 1:

You can log into the Docker container using the root user (ID = 0) instead of the provided default user when you use the -u option. E.g.

docker exec -u 0 -it mycontainer bash

root (id = 0) is the default user within a container. The image developer can create additional users. Those users are accessible by name. When passing a numeric ID, the user does not have to exist in the container.

from Docker documentation

Update: Of course you can also use the Docker management command for containers to run this:

docker container exec -u 0 -it mycontainer bash

Solution 2:

Eventually, I decided to rebuild my Docker images, so that I change the root password by something I will know.

RUN echo 'root:Docker!' | chpasswd

RUN echo 'Docker!' | passwd --stdin root

Solution 3:

There are a couple of ways to do it.

To run the Docker overriding the USER setting
```
 docker exec -u 0 -it containerName bash
```

docker exec -u root -it --workdir / <containerName> bash

Make necessary file permissions, etc., during the image build in the Docker file
If all the packages are available in your Linux image, chpasswdin the dockerfile before the USER utility.

For complete reference: http://muralitechblog.com/root-password-of-a-docker-container/

Solution 4:

To create/change a root password in a running container

docker exec -itu 0 {container} passwd

Solution 5:

I am able to get it working with the below command.

root@gitnew:# docker exec -it --user $(username) $(containername) /bin/bash