[XorNot]

"unattended upgrades".

Why? With VMs there is no reason, ever, to be modifying the OS with the VM still running, rather then cutting over to a new, tested instance.

[willejs]

Sorry, I was referring to security updates through unattended updates. Its pretty hard to do if your machine is storing state or is running a lot of traffic. Whilst churning your entire estate should be possible, it is not always.