use only for testing, not for production. cirrOS was made for testing cloud environments.
apt install guestfish -y
version=$(curl -s https://download.cirros-cloud.net/version/released)
wget https://download.cirros-cloud.net/${version}/cirros-${version}-x86_64-disk.img -O cirrOS.qcow2
name=cirros-${version}
osname=$(virt-install --osinfo list|grep -i cirros|head -1)