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Description of problem: Currently, virt-sysprep net-hostname is only removing hostname from ifcfg files which is not adequate for clearing the hostname from the VM. We also have to remove it from /etc/sysconfig/network and /etc/hostname so that it would make sure that the hostname is properly removed from the VM. Version-Release number of selected component (if applicable): libguestfs-1.36.10 How reproducible: 100% Steps to Reproduce: 1. Run virt-sysprep on an image. The hostname is not correctly removed from the VM. Actual results: virt-sysprep is not removing hostname correctly. Expected results: virt-sysprep should remove hostname correctly. Additional info:
A guest always has an hostname, be it "vm01.intranet.corp.com" or simply "localhost.localdomain". You cannot "clear" the hostname from an OS. If you want to use the same template as a base for creating multiple VMs, then the best way is to use e.g. virt-customize/virt-sysrep --hostname (offline), cloud-init (at runtime), or any other solution to set the hostname.
Closing this bug, as virt-sysprep works as intended, and --hostname must be used to change the hostname.