Episode 12 of the InventiveHQ KVM virtualization series.
Lab verified July 2026 · Ubuntu 26.04 · libvirt 12.0.0 · QEMU 10.2.1
What this episode proves
- Create a reversible guest boot failure
- Attach rescue media or mount an overlay-backed disk offline
- Repair the filesystem or configuration
- Boot normally and validate the repaired service
Validated workflow
1. Create a reversible guest boot failure
virt-customize -d ep12-rescue01 --run-command 'systemctl set-default multi-user.target'
2. Attach rescue media or mount an overlay-backed disk offline
virsh start ep12-rescue01
3. Repair the filesystem or configuration
virsh qemu-agent-command ep12-rescue01 '{"execute":"guest-ping"}'
Finished state
Demo-ubuntu01 boots normally with rescue media detached and repair evidence retained. The public scripts contain no private keys, passwords, or tokens. Review names, addresses, paths, ownership, backups, quorum, and fencing for your own environment before running them.