Docker container with SSH

berndbausch · 10-05-2020, 04:42 AM

Quote:

Originally Posted by banderas20

However, If I issue the following command to run the image:

Code:

docker run -ti -v /sys/fs/cgroup:/sys/fs/cgroup:ro centos7-systemd

It crashes with this error:

Code:

Failed to mount tmpfs at /run: Operation not permitted
[!!!!!!] Failed to mount API filesystems, freezing.

Exactly the same thing happened to me. No idea why, but the Stackoverflow thread saved me.

berndbausch · 10-05-2020, 04:46 AM

Quote:

In short: First start the default process in the container, which is /sbin/init (see the Dockerfile). This runs systemd. Then run a shell inside the container, install sshd and start it with systemctl.

Quote:

Originally Posted by banderas20

This last part I didn't understand. Anyway, I finally managed to get it up and running.

I mean that the first command is docker run. It launches the process defined by CMD ["/usr/sbin/init"] in the Dockerfile. This also launches systemd.
Second step: Run a shell in this container with docker exec. From this shell, you can install sshd and start it.

banderas20 · 10-06-2020, 03:33 AM

@berndbausch,

thanks a million, mate!