[PVE-User] 2 questions about upgrading

[Dietmar Maurer]

> First, we are running a 1.5 cluster and i would like to upgrade to 1.8.  I was under
> the impression that a reboot of the host node was required when you upgrade,
> however I upgraded one host to 1.8, did not reboot and everything seems fine,
> so I am wondering if this is supported.  Clearly it would be great if I could
> upgrade Proxmox with out vm interruption.

There is no need to reboot, unless you want a new kernel. 
But it is very likely that you also updated the kernel, so you need to reboot. 

- Dietmar