Unable to find user root: no matching entries in passwd file in Docker

You can use this command to access to the container with root user:

docker exec -u 0 -i -t {container_name_or_hash} /bin/bash

try debug with that. i think the script maybe remove or disable root user.

This issue is caused by a docker engine bug but which is tracked privately, Docker is asking users to restart the engine!

It seems that the bug is likely to be older than two years!

https://success.docker.com/article/ucp-health-checks-fail-unable-to-find-user-nobody-no-matching-entries-in-passwd-file-observed

https://forums.docker.com/t/unable-to-find-user-root-no-matching-entries-in-passwd-file/26545/7

... what can I say, someone is doing his best to get more funding.