set password to qcow2

$ virt-customize -a rhel-guest-image-7.2-20160302.0.x86_64.qcow2 --root-password password:PASSW0RD --uninstall cloud-init
[   0.0] Examining the guest ...
[  12.1] Setting a random seed
[  12.1] Uninstalling packages: cloud-init
[  14.5] Setting passwords
[  15.9] Finishing off

set password to qcow2

原文：https://www.cnblogs.com/allenhaozi/p/10920104.html