We use CoreOS but I'm still not sold on automatic updates. We've seen too many issues running disparate versions of etcd or docker. To their credit - it seems

We use CoreOS but I'm still not sold on automatic updates. We've seen too many issues running disparate versions of etcd or docker. To their credit - it seems to be getting better but still not prime time. Plus, we really want to push for an 'immutable' production model which is counter to automatic updates.