[libvirt-users] "virsh define" modify xml configuration file

[Laine Stump]

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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