diff --git a/docs/upgrade-k8s-1.33.md b/docs/upgrade-k8s-1.33.md index 3a6926f..b994093 100644 --- a/docs/upgrade-k8s-1.33.md +++ b/docs/upgrade-k8s-1.33.md @@ -143,7 +143,7 @@ about 1.2 ms. Constraints: - microk8s 1.32 and 1.33 ship k8s-dqlite v1.3.5 (dqlite 1.17 LTS). VACUUM - needs dqlite 1.18.2+ (microk8s 1.36). `dbctl restore` writes into the + needs dqlite 1.18.2+ (microk8s 1.34 and up). `dbctl restore` writes into the running DB, so it doesn't shrink anything. - microk8s 1.34+ ships k8s-dqlite 1.8.x with a reworked write path; that is where Canonical fixed this class of problem (canonical/microk8s#5153). @@ -163,7 +163,7 @@ do the first three steps: `ssh -t ruben@192.168.1.204 ./dqlite-tuning.sh` (were ~3), 0 of 9,445 lease updates over 4s, no controller restarts - [ ] Optional: Longhorn backupstore poll interval 300s -> 1800s (backupvolume updates are ~8% of all writes) -- Later: microk8s 1.34+ for the new write path and 1.36 for VACUUM, see +- Later: microk8s 1.34+ for the new write path and VACUUM, see "On to 1.36" below. `--cgroups-per-qos=false`, the likely trigger of the 1.32->1.33 kubelite @@ -172,19 +172,43 @@ panic (#5057), is not set in `args/kubelet`. ## On to 1.36 microk8s goes up one minor per refresh. 1.34 brings k8s-dqlite 1.8.x with -the reworked write path, 1.36 brings dqlite 1.18.2, which can VACUUM the -mostly empty database. Before every hop: fresh Velero backup, no +the reworked write path and dqlite 1.18.2, which can VACUUM the mostly +empty database. Before every hop: fresh Velero backup, no deprecated APIs in use (`apiserver_requested_deprecated_apis` metric empty), and the Calico manifest of the target version (canonical/microk8s branch ``, `upgrade-scripts/000-switch-to-calico/resources/calico.yaml`). +Findings from 2026-10-23: +- microk8s 1.34, 1.35 and 1.36 all ship k8s-dqlite v1.8.1, which is built + against dqlite v1.18.2 (1.33: v1.3.5 with dqlite v1.17.1). So VACUUM is + possible from 1.34 on; 1.35 and 1.36 are for staying in support + (Kubernetes 1.34 reaches end of life on 2026-10-27). +- Calico is v3.29.3 in all four branches, so no CNI change. +- containerd stays 1.7.29 on 1.34 but jumps to 2.1 on 1.35 and 2.2 on 1.36. + Check `args/containerd-template.toml` before 1.35: it still has the old + `pause:3.7` sandbox image. +- `backend/tuning.yaml` still works in k8s-dqlite 1.8.1 (defaults there: + threshold 512, trailing 4096, dynamic strategy). +- The 1.34 configure hook adds + `ListFromCacheSnapshot=false,SizeBasedListCostEstimate=false,DetectCacheInconsistency=false` + to the existing `--feature-gates=WatchList=false` line for kine + clusters. WatchList is still beta in 1.34, so it can stay off. +- `certs/front-proxy-client.crt` expired on 2025-09-13 and microk8s never + renews it (canonical/microk8s#5576). Nothing uses the aggregation layer + here yet, but it gets renewed with the refresh. + ### microk8s 1.34 -- [ ] Read canonical/microk8s#5568 (LIST stalls with k8s-dqlite on 1.34) -- [ ] Offline backup first: k8s-dqlite 1.8 migrates the schema on first - start, so 1.33 can't read the database afterwards. - `microk8s stop; sudo tar -cf /root/backend-1.33.tar /var/snap/microk8s/current/var/kubernetes/backend; microk8s start` -- [ ] `sudo snap refresh microk8s --channel=1.34/stable`, then - `sudo microk8s addons repo update core` and Calico +- [x] Read canonical/microk8s#5568: 1.34 locks ConsistentListFromCache on, + and k8s-dqlite's watch progress notifications lag under load, so LISTs + can wait up to 3s before falling back to storage. Latency, not + correctness; worst on busy HA clusters. Still open +- [ ] Fresh Velero backup (`pre-microk8s-1-34-202610232134`) +- [ ] `ssh -t ruben@192.168.1.204 ./microk8s-1.34.sh`: dbctl backup, an + offline copy of the backend (k8s-dqlite 1.8 migrates the schema on first + start, so 1.33 can't read it afterwards), `snap refresh` to 1.34/stable, + the addons repo, and the front-proxy certificate +- [ ] Afterwards: LIST latency (`apiserver_watch_cache_read_wait_seconds`), + lease update times and controller restarts ### Components for 1.35 and 1.36 - [ ] Longhorn 1.11.2 → 1.12 → 1.13 (one minor at a time, now allowed on @@ -199,7 +223,8 @@ branch ``, `upgrade-scripts/000-switch-to-calico/resources/calico.yaml` - [ ] `sudo snap refresh microk8s --channel=1.36/stable`, addons repo, Calico ### Shrink the database -- [ ] On dqlite 1.18.2+: offline backup, then a supervised VACUUM (the - maintainers advise against running it unattended). Expect the file to - go from ~709 MB to ~35 MB and snapshots to shrink with it +- [ ] On dqlite 1.18.2+ (so from microk8s 1.34): offline backup, then a + supervised VACUUM (the maintainers advise against running it + unattended). Expect the file to go from ~709 MB to ~35 MB and snapshots + to shrink with it