Safe domain XML editing

Domain XML is the authoritative persistent guest definition. Capture it, validate the proposed file, define it, and confirm that libvirt normalized what you intended.

Change procedure

virsh dumpxml guest01 > /root/guest01.$(date +%F-%H%M).xml
cp -a /root/guest01.xml /root/guest01.xml.bak
vi /root/guest01.xml
virt-xml-validate /root/guest01.xml domain
virsh define /root/guest01.xml
virsh dumpxml guest01

virsh edit guest01 is appropriate for small controlled changes. A file-based flow is easier to review, diff, validate, and roll back.

Live versus persistent configuration

The active XML and inactive XML can differ.

virsh dumpxml guest01 > /root/guest01.live.xml
virsh dumpxml guest01 --inactive > /root/guest01.config.xml
diff -u /root/guest01.config.xml /root/guest01.live.xml

Rollback

virsh define /root/guest01.previous.xml

Defining XML restores persistent configuration. It does not automatically reverse a live-only device operation or repair storage data.