I'm trying to spin up some Cumulus VX instances under RHEL7.2 using virsh/virt-install, and while I can get them to start up I am unable to SSH into them. After some inspection on the console, it appears the ssh host keys aren't being generated. If I manually generate them myself using ssh-keygen and restart sshd, then I can ssh in. I'm using the 2.5.5 KVM image, FWIW.
Is there something I've done in how these were spun up that was incorrect, or are the keys really not supposed to be generated by default?