[ovirt-users] Upgrading single host ovirt "clusters" to v4.5 via command line?

Hello all, As the title suggests I have a couple of single-host hyper converged setups, mostly used for testing. As I cannot use the GUI cluster upgrade method on a single host (it requires me to reboot the host, which will require me to shutdown the hosted engine), is there any method to upgrade the cluster / data-center via command line in maintenance=global mode? Beyond that, can I use the same method on my production setups? (multi-node, gluster based setups). Thanks, Gilboa