qemu-img create -f qcow2 /var/lib/libvirt/images/overcloud-controller1.qcow2 96G

virt-install --ram 5120 \
             --vcpus=4,sockets=1,cores=4 \
             --os-variant rhel7 \
             --disk path=/var/lib/libvirt/images/overcloud-controller1.qcow2,device=disk,bus=virtio,format=qcow2,discard=unmap \
             --graphics vnc \
             --network network:provisioning,model=virtio \
             --network network:external,model=virtio \
             --name overcloud-controller1 \
             --hvm \
             --virt-type kvm \
             --memballoon virtio \
             --cpu host \
             --dry-run \
             --rng /dev/urandom \
             --print-xml > /etc/libvirt/qemu/overcloud-controller1.xml

virsh define --file /etc/libvirt/qemu/overcloud-controller1.xml

# Gather mac information from VM(s) it will be needed later. 
grep -A1 "mac address" /etc/libvirt/qemu/overcloud-controller1.xml