Centralized Authentication for Logging Into Containers

[dtheese]

We are using Proxmox 4.4 with LXC containers. I have a growing number of containers and a growing number of users. Giving each user a local account on each container is quickly getting unwieldy.

I have managed to give each user a single roaming home directory by:

1. Creating an account on the host for them
2. Configuring each container with a mount point that mounts the host's /home onto that containers /home

This is a step in the right direction, but each user still has a local account on each container. I would like to create *one* account for each user, and use a centralized remote authentication server.

Does the Proxmox 4.4 host have built-in support for centralized remote authentication services for logging into individual containers? Or, must I use something such as LDAP or RADIUS?