[lxc-users] Recent LXC / LXD and shared file systen infrastructures

[Jäkel, Guido]

Dear experts,

I wonder if the current versions of LXD (and LXC) are aware of a shared file infrastructure like NFS. I'm using LXC 0.8 since a couple of years on a setup based on a bunch of diskless bladeservers (Cisco UCS) and a central NFS filer (Netapp). All the root filesystem (the containers and the host) are a formed by individual directory trees on the NFS. All setup of resources, network and filesystem (root and shared data) is externalized from the Containers - all the configuration information is on a shared resource, too. From this, I'm able to start each container (at a time) on any host. Now it's time to upgrade (or better say rebuild) all of it to get the promises of recent cgroup handling, lxc-fs, uid/gid-shifting and so on.

I want to ask, if this design is covered by the infrastructure assumptions of current LXD. In special, if I "transfer" (copy or move) a container to another host, is it possible to configure the lxc daemon environment in such a way, that the container root file system will not be copied from host A to host B because it's "already there"? Is it save to share caching directories for images?


And by the way: Is there any know way to marry NFS with an overlay filesystem facility?


Greetings

Guido