On 10/18/2017 06:59 AM, d tbsky wrote:

hi: I upgrade my system from rhel 7.3 to 7.4. so libvirt upgrade to 3.2.

I found command "virsh define vm.xml" sometimes modify "vm.xml".

That command would only modify the file "vm.xml" if it was located in /etc/libvirt/qemu (or /etc/libvirt/lxc, or whatever was appropriate for the domain type) *and* the domain's <name> happened to be "vm". If that's what's happening, this email should be your warning to never directly modify or access the files in /etc/libvirt; they are files used internally by libvirt, and modifying them can lead to "unexpected" results.

I thought the command will read vm.xml, not write to it. is this kind of behavior by design?

for example vm.xml with the line

<cpu mode='custom' match='exact'>

will be replaced with

<cpu mode='custom' match='exact' check='partial'>

Regards, tbskyd

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