OCI runtime exec failed

[Adspectus]

I try to execute a shell within a watchtower container, but all methods like docker exec -it watchtower /bin/sh only show this error:

OCI runtime exec failed: exec failed: unable to start container process: exec: "/bin/sh": stat /bin/sh: no such file or directory

Replacing /bin/sh with other shell results in same error message.

Is this normal behavior?

[nicholas-fedor]

Yes, because the Watchtower container uses a scratch container.
If you need shell access within the container namespace, then use nsenter.