User Namespaces In podman

[Hsadikot]

I was trying to execute the lab exercises for the DO180 course. When I tried to execute the following command:

sudo podman run --name persist-db \  > -d -v /var/local/mysql:/var/lib/mysql/data \ > -e MYSQL_USER=user1 -e MYSQL_PASSWORD=mypa55 \ > -e MYSQL_DATABASE=items -e MYSQL_ROOT_PASSWORD=r00tpa55 \ > rhscl/mysql-57-rhel7

Since I am revisiting this exercise the container was already built. Hence I had to remove it first for which i Used the podman remove command. After using this command It gave me an error:

Error using podman rm commanduser namespaces are not enabled in /proc/sys/user/max_user_namespaces.   

Is disabling user namespaces related to the concept of rootless containers?. If yes then how do I resolve this error so that I can continue with the exercise.

Thanks,

Huzefa

[flozano · Accepted solution]

Hi @Hsadikot - the DO180 environment is not setup for rootless containers, so you need sudo in every podman command. See that your first command includes sudo, while in the second you missed it.