We had an interesting situation this morning. For some reason one node in our cluster was not showing as active (green "running" arrows on the guest icon on the tree) and all the LXC's were not responding. We managed to address the issue as quickly as possible by simply resetting the node and...
So I dont know if this is just my local network causing me problems but its been repeatable and Ive spent two days trying to figure out and only 1 hour ago have I figured it out. Its occurred on both 18.04 and 18.10. Somehow the name servers and search settings for dns are being assigned...