How to delete a VM with snapshots

A note about error: “cannot delete inactive domain with snapshots”

You cannot delete a VM with snapshots. For example:
# virsh undefine --domain openbsd
Sample outputs:

error: Failed to undefine domain openbsd
error: Requested operation is not valid: cannot delete inactive domain with 2 snapshots

To list snapshots, enter:
# virsh snapshot-list --domain VM_NAME
# virsh snapshot-list --domain openbsd
Sample outputs:

 Name                 Creation Time             State
------------------------------------------------------------
 3sep2016             2016-09-02 13:38:18 -0500 shutoff
 3sep2016u1           2016-09-02 15:04:50 -0500 shutoff

The syntax is as follows to delete snapshot:
# virsh snapshot-delete --domain VM_NAME --snapshotname SNAPSHOT_NAME
To delete both snapshots, enter:
# virsh snapshot-delete --domain openbsd --snapshotname 3sep2016 
Domain snapshot 3sep2016 deleted

# virsh snapshot-delete --domain openbsd --snapshotname 3sep2016u1 
Domain snapshot 3sep2016u1 deleted

Verify it:
# virsh snapshot-list --domain openbsd
Name Creation Time State
------------------------------------------------------------

Now delete the vm:
# virsh undefine --domain openbsd
Domain openbsd has been undefined
# rm -f /nfswheel/kvm/openbsd.qcow2

参考文章：https://www.cyberciti.biz/faq/howto-linux-delete-a-running-vm-guest-on-kvm/