basicstack/stack.basicstack.de

CTO Agent 19af6918f0 feat(os-update): reconcile Docker + label after node updates (DEV-499)

The weekly rolling OS-update cycle has been silently stripping docker.io from
worker nodes (DEV-498), breaking the Forgejo runner whose hostPath mount for
/var/run/docker.sock requires the socket to exist. Fix in two layers:

- Defensive pin: update-node.sh now runs `apt-mark manual docker.io` in the
  apt phase (whenever it is installed) so `apt-get autoremove --purge` cannot
  silently drop it during subsequent upgrades.
- Post-reboot reconciliation: new `ensure-node-docker.sh` installs docker.io
  if missing, enables + starts the systemd unit, waits for /var/run/docker.sock,
  and re-applies the `basicstack.de/docker=true` label. Wired into
  update-node.sh between kubelet-Ready and uncordon. No-op on nodes without
  the label (safe for cp-1 and the update runner).

Verified idempotent against all 5 labeled workers; `apt-mark manual docker.io`
now set on every worker (survived across reboots by design).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

2026-08-16 20:22:43 +00:00

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OS Update Automation

Scripts that implement the weekly rolling Ubuntu OS-update procedure.

Authoritative doc: ../../OS_UPDATE_PROCEDURE.md — read it first. The scripts here mirror that procedure step-for-step.

Files

Script	Purpose
`cluster-health.sh`	Non-zero if any node is not Ready, any pod is not Running/Ready, or any Deployment/StatefulSet is below its desired replica count. Used at preflight and after each node.
`update-node.sh <node>`	Drain, apt-update, reboot-if-required, wait for Ready, ensure Docker on labeled nodes, uncordon, post-node health check. Retriable per-node.
`ensure-node-docker.sh <node>`	Idempotent: on nodes labeled `basicstack.de/docker=true`, install docker.io if missing, `apt-mark manual`, enable+start the docker service, wait for `/var/run/docker.sock`, re-apply the label. No-op on nodes without the label. Called from `update-node.sh` between "kubelet Ready" and "uncordon"; also runnable ad-hoc for recovery.
`os-update.sh`	Full cycle runner: preflight → etcd snapshot → ordered per-node loop → finalization + apt history digest.

Order of operations (encoded in `os-update.sh`)

Workers with no stateful affinity concerns first.
fsn1 workers (potential Stalwart hosts) last among workers — see stalwart-datacenter-affinity note.
k3s-cp-1 last (single control plane).
One node at a time. Never in parallel.

Guardrails the scripts enforce

Preflight cluster health failure → refuse to start.
Drain with a PDB conflict → uncordon and mark the node SKIPPED_DRAIN_FAILED, never --force.
Node reboot fails to come back within timeout → hard stop, escalate. Do NOT rebuild the node or touch k3s config.
kubelet doesn't return Ready → hard stop, escalate. Do NOT touch k3s config.
Post-node cluster health check red → hard stop, do not proceed to the next node.
Absolute rule: no k3s config, no manifests, no PVs, no service files touched — apt/dpkg only.

Typical invocations

# Dry-run: print the ordered plan, touch nothing.
./os-update.sh --dry-run

# Full cycle (weekly, triggered by the Paperclip routine).
./os-update.sh

# Retry a single node (after fixing a manual issue).
./update-node.sh k3s-worker-3

# Restart a partial cycle from a specific node onward.
./os-update.sh --start-from k3s-worker-4

# Ad-hoc: reconcile Docker on a single node (e.g. after emergency ops).
./ensure-node-docker.sh k3s-worker-3

Logs land in /tmp/os-update-<UTC-timestamp>/ on the machine that ran the cycle.

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