Episode 20 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 bounded CPU, disk, and network symptoms one at a time
- Correlate libvirt counters with host and guest evidence
- Identify the actual bottleneck before changing configuration
- Remove the load and prove counters and latency recover
Validated workflow
1. Create bounded CPU, disk, and network symptoms one at a time
virsh domstats ep18-migrate01 --vcpu --balloon
2. Correlate libvirt counters with host and guest evidence
virsh domblkstat ep18-migrate01 vda --human
3. Identify the actual bottleneck before changing configuration
virsh domifstat ep18-migrate01 vnet24
4. Remove the load and prove counters and latency recover
./run-bounded-loads.sh ep18-migrate01 192.168.122.81 /tmp/guest-key
Finished state
All synthetic load is stopped and the guest returns to the Episode 19 resource configuration. 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.