Table of Content
generate qcow2 base image
virt-builder centos-7.6 \ --format qcow2 \ --size 20G -o /var/lib/libvist/boot/centos-7.6-20G.qcow2 verified type of disk is qcow2 by qemu-img info /var/lib/libvist/boot/centos-7.6-20G.qcow2
will use this base image as template for future vm quick launch.
clone base image disk to vm disk
cp /var/lib/libvist/boot/centos-7.6-20G.qcow2 /var/lib/libvist/images/testvm.qcow2
create vm testvm by importing existing qcow2,
virt-install --import --name testvm2 \ --ram 1024 \ --vcpu 1 \ --disk path=/var/lib/libvist/images/testvm.qcow2,device=disk,format=qcow2 \ --nographics --serial=pty --os-type=linux --os-variant rhel7 \ --noautoconsole --noreboot
cannot start up testvm due to driver type is raw, which should be qcow2,
virsh dumpxml testvm | grep driver
<driver name='qemu' type='raw'/>as remedy, change type from raw to qcow2, then can start testvm properly.