Post-Mortems

Incident reviews for the viktorbarzin.me Kubernetes cluster

2026-04-14 SEV 1
NFS fsid=0 Cascade — DNS + Vault + Multi-Service Outage

5h outage: fsid=0 in PVE /etc/exports broke NFSv4 subdirectory mounts → Technitium primary I/O errors → Vault lost quorum → Alertmanager blind → 25+ pods affected across 15+ namespaces.
2026-03-16 SEV 1
NFS CSI Cascade Failure

47h outage: NFS CSI driver liveness-probe port conflict → all NFS mounts fail → 40+ pods stuck across 20+ namespaces.
2026-03-16 SEV 1
Kured + Containerd Cascade Outage

26h cluster outage: unattended-upgrades kernel update → kured reboot → containerd overlayfs snapshotter corruption → calico down → cascading failure across all 5 nodes.