[user5994461]

Don't get me wrong, I know it's not a bug in kubernetes, it's a bug in the filesystem. Kubernetes is as stable as the weakest part and the weakest part is the container engine (docker and underneath).

Containers require volumes/filesystems to run and some implementations are buggy as fuck.

Docker abandoned CentOS 6 many years ago, whether they stated officially or not, the last docker package and kernel/drivers are unstable. Similar story on some other distributions.

It wasn't production-ready at all back then and it's still not a good idea to containerize databases now. Besides bugs that come and go, there are other challenges around lifecycle, performance and permissions that are not trivial to deal with.