If you manage to create persistent containers how are you going to update them down the road? Like I have said previously, Samba isn’t designed in a way that allows for effectively hot swapping system components.

It seems like it would better to create a VM template and then setup a fail over cluster. Just make sure you have a time server somewhere on the network.

If you are dead set on containers you could try LDAP in a container. I just don’t think active directory was built for Linux containerization.