Execute break-fix exercises, document results and fix VMIDs
Exercises executed on 2026-02-24:
- Exercise 1 (Update Observation): observed download, A/B switch, DB-leader
transfer during reboot. All 3 nodes updated to 202602240349.
- Exercise 3 (Network Isolation): OVN gateway is SPOF (no failover),
east-west traffic survives, MAC change causes boot hang.
- Exercise 4 (Full Node Failure): 2/3 quorum held, ~20s detection,
~50s recovery, instances auto-restart.
- Exercise 2 (Simulated Failed Update): blocked (no update available).
Fixes: VMIDs corrected from 900-902 to 400-402, added MAC safety rule,
documented Proxmox API --data-urlencode requirement for MAC addresses.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Maarten
360fba5680