48 lines
2.1 KiB
Markdown
48 lines
2.1 KiB
Markdown
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# OS Update Automation
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Scripts that implement the weekly rolling Ubuntu OS-update procedure.
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**Authoritative doc:** [`../../OS_UPDATE_PROCEDURE.md`](../../OS_UPDATE_PROCEDURE.md) — read it first. The scripts here mirror that procedure step-for-step.
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## Files
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| Script | Purpose |
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|--------|---------|
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| `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. |
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| `update-node.sh <node>` | Drain, apt-update, reboot-if-required, wait for Ready, uncordon, post-node health check. Retriable per-node. |
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| `os-update.sh` | Full cycle runner: preflight → etcd snapshot → ordered per-node loop → finalization + apt history digest. |
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## Order of operations (encoded in `os-update.sh`)
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1. Workers with no stateful affinity concerns first.
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2. `fsn1` workers (potential Stalwart hosts) last among workers — see [`stalwart-datacenter-affinity`](../../K3S_OPERATIONS.md) note.
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3. `k3s-cp-1` last (single control plane).
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4. One node at a time. Never in parallel.
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## Guardrails the scripts enforce
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- Preflight cluster health failure → refuse to start.
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- Drain with a PDB conflict → uncordon and mark the node `SKIPPED_DRAIN_FAILED`, never `--force`.
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- Node reboot fails to come back within timeout → hard stop, escalate. Do NOT rebuild the node or touch k3s config.
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- kubelet doesn't return `Ready` → hard stop, escalate. Do NOT touch k3s config.
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- Post-node cluster health check red → hard stop, do not proceed to the next node.
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- Absolute rule: **no k3s config, no manifests, no PVs, no service files touched** — apt/dpkg only.
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## Typical invocations
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```bash
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# Dry-run: print the ordered plan, touch nothing.
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./os-update.sh --dry-run
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# Full cycle (weekly, triggered by the Paperclip routine).
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./os-update.sh
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# Retry a single node (after fixing a manual issue).
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./update-node.sh k3s-worker-3
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# Restart a partial cycle from a specific node onward.
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./os-update.sh --start-from k3s-worker-4
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```
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Logs land in `/tmp/os-update-<UTC-timestamp>/` on the machine that ran the cycle.
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