I want to create a template for multiple vm deployment from a existing image. I basically have a "template" vm ready with image in qcow2 format at path "/kvm/template.qcow2". I have heard about "virt-sysprep" which can modify hostname, ssh host keys, and etc. -- all packages are installed.

When I try to run the basic "virt-sysprep" command, I get a "no operating system found" error. My Host Machine is Centos 6.9 , and guest vm is Centos7.

[root@ns0 kvm]# virt-sysprep --format qcow2 -a template.qcow2
Examining the guest ...
virt-sysprep: no operating systems were found in the guest image
[root@ns0 kvm]#
[root@ns0 kvm]#
[root@ns0 kvm]# ls -lh | grep template.qcow2
-rw-r--r-- 1 root root  16G Aug 16 05:27 template.qcow2

closed as off-topic by Jeff Schaller, Stephen Rauch, Archemar, sebasth, Satō Katsura Oct 9 '17 at 9:15

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions describing a problem that can't be reproduced and seemingly went away on its own (or went away when a typo was fixed) are off-topic as they are unlikely to help future readers." – Jeff Schaller, Stephen Rauch, Archemar, sebasth, Satō Katsura
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Actually I resolved it, it basically requires your VM partition to be not on LVM. i.e it should be vda1, vda2, sda1, etc.

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