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So I've ended with this ZFS and Docker combination on my home storage some time ago. I use ZFS on Linux to safely store data and I use Docker to run services like samba, plex, owncloud, and others on top of that data.
I've been using devicemapper on top of ZFS and it was mostly good. Every now and then I had this strange issue of layer not being available while starting container, (as if docker tried to spin up the container before having the storage ready for it) just re-running the container solved the issue. I've never seen this at work, where we use Docker in production quite a lot and in my case it was transparently handled by upstart so I've just assumed the combination of devicemapper and ZFS caused these. Besides that I was quite happy with the whole system.
Recently I was wondering if there was some progress on the ZFS storage backend and I was pleasantly surpriset, that this is actually built in sice couple versions ago. (how did I miss that, I have no idea) So let's try it?
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