Question

A virtual machine named VM1 fails to boot after a botched in-guest OS update. You have a snapshot of VM1's original OS disk taken before the update. You want to restore VM1 to its previous working state with the least administrative effort while keeping the same VM configuration, name, and network interface. What should you do?

Accepted Answer

Create a new managed disk from the snapshot, then swap the OS disk of VM1 to the new disk while VM1 is stopped (deallocated).

Answer

Delete VM1 and redeploy a new VM from the snapshot using an ARM template.

Answer

Attach the snapshot directly to VM1 as a data disk and change the boot order.

Answer

Enable boot diagnostics and use the serial console to roll back the OS update inside the guest.