The base-image is a completely different matter. There is no reason to switch from CentOS/Fedora to Ubuntu just because you changed the host OS

>> Yes, there is. There is a known issue using AUFS(Which Ubuntu uses for Docker) with CentOS/Fedora images:

https://github.com/docker/docker/issues/6980

To make it easier, I just changed the base image from CentOS/Fedora to Ubuntu so I do not have to worry about it.