assuming the host is up and running already
as user (assuming you’re a member of the libvirt group)
guest=obsd69 osinfo-query os | grep openbsd | tail -2 variant=... mkdir -p /data/guests/$guest/ cd /data/guests/$guest/ virt-install \ --name $guest \ --vcpus 2 \ --ram 256 \ --disk path=/data/guests/$guest/$guest.qcow2,size=8,bus=virtio \ --cdrom /data/ISO-IMAGES/install69.iso \ --network bridge=virbr0,model=virtio \ --os-variant $variant \ --graphics vnc --noautoconsole
and select serial console during installation
now check that serial console works
virsh console obsd69
pre-define some libvirt interface and shut the machine down to eventually use it as a template
e.g. for OpenBSD
vi /etc/myname obsd vi /etc/hostname.vio2 inet 192.168.122.19/24 up vi /etc/hosts 192.168.122.19 obsd shutdown -p now virsh undefine obsd69 ls -lhF /data/kvm/obsd69.qcow2
start from scratch
virsh destroy obsd69 virsh undefine obsd69 rm -f /data/kvm/obsd69.qcow2
in case you didn’t get the chance to get a serial console already
vi /etc/boot.conf set tty com0 vi /etc/ttys tty00 "/usr/libexec/getty std.9600" vt220 on secure
https://www.cyberciti.biz/faq/kvmvirtualization-virt-install-openbsd-unix-guest/
https://bobcares.com/blog/install-openbsd-as-guest-operating-system-using-kvm-virt-install/
http://daemonforums.org/showthread.php?t=8791
https://www.cyberciti.biz/faq/howto-linux-delete-a-running-vm-guest-on-kvm/
https://computingforgeeks.com/use-virt-manager-as-non-root-user/