Upgrading k3s Across Five Minor Versions: v1.29 to v1.34 on a Homelab Cluster
TL;DR Upgraded a production k3s cluster from v1.29.0+k3s1 to v1.34.4+k3s1 across 8 nodes — 3 control plane servers, 4 amd64 worker agents, and 1 arm64 Lima VM agent. The upgrade stepped through every minor version (v1.29 → v1.30 → v1.31 → v1.32 → v1.33 → v1.34) with etcd snapshots between each step. Longhorn was upgraded from v1.6.0 to v1.8.2 in two stages (v1.7.3 as an intermediate step). SSH was broken to all cluster nodes, so the entire upgrade was done via Proxmox QEMU Guest Agent (qm guest exec) and Lima CLI (limactl shell). Discovered that k3s intentionally pins Traefik to v2.11.24 even when bundling Helm chart v27 — Traefik v3 migration is a separate effort. ...