devvm: vendor cluster-health into per-user agent-skill snapshot
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Make cluster-health a user-global skill for emo (the lone entry in the provisioner's SKILL_USERS allowlist), so it's available from any directory — not only when working inside the infra clone where it already exists as a project skill (.claude/skills/cluster-health). install_skills() in t3-provision-users.sh copies the vendored snapshot into ~/.agents/skills/ and symlinks ~/.claude/skills/, so this is the durable, rebuild-surviving path. cluster-health is homelab-local (vendored from this repo's own .claude/skills/), unlike the other snapshot entries which mirror upstream mattpocock/skills + vercel-labs/skills; README documents its provenance and the explicit re-sync step so the vendored copy doesn't silently drift. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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2 changed files with 467 additions and 2 deletions
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@ -19,13 +19,24 @@ unpinned-CLI dependencies out of the hourly **root** reconcile.
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- `mattpocock/skills` (https://github.com/mattpocock/skills) — all except `find-skills`
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- `mattpocock/skills` (https://github.com/mattpocock/skills) — all except `find-skills`
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- `vercel-labs/skills` (https://github.com/vercel-labs/skills) — `find-skills`
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- `vercel-labs/skills` (https://github.com/vercel-labs/skills) — `find-skills`
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- **homelab-local** — `cluster-health` is vendored from this repo's own
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`.claude/skills/cluster-health/` (the canonical copy, a project skill in the
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infra clone). It is NOT in `~/.agents/skills/`, so the `cp -a` refresh below
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does NOT update it — re-copy it explicitly when the canonical skill changes
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(see Refreshing).
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## Refreshing
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## Refreshing
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Re-snapshot from a current install and commit the diff:
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Re-snapshot the upstream skills from a current install and commit the diff:
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```sh
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```sh
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cp -a ~/.agents/skills/. scripts/workstation/claude-skills/
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cp -a ~/.agents/skills/. scripts/workstation/claude-skills/
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```
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```
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Snapshot taken 2026-06-23.
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Re-sync the homelab-local skill(s) from their canonical in-repo copy:
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```sh
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cp -a .claude/skills/cluster-health scripts/workstation/claude-skills/
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```
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Snapshot taken 2026-06-23 (upstream); `cluster-health` vendored 2026-06-26.
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454
scripts/workstation/claude-skills/cluster-health/SKILL.md
Normal file
454
scripts/workstation/claude-skills/cluster-health/SKILL.md
Normal file
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@ -0,0 +1,454 @@
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---
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name: cluster-health
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description: |
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Check Kubernetes cluster health and fix common issues. Use when:
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(1) User asks to check the cluster, check health, or "what's wrong",
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(2) User asks about pod status, node health, or deployment issues,
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(3) User asks to fix stuck pods, evicted pods, or CrashLoopBackOff,
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(4) User mentions "health check", "cluster status", "cluster health",
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(5) User asks "is everything running" or "any problems".
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Runs 47 cluster-wide checks (nodes, workloads, monitoring, certs,
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backups, external reachability, PVE host thermals + load, HA Sofia
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status dashboard, Immich smart-search, Proxmox CSI ghost-disk drift)
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with safe auto-fix for evicted pods.
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author: Claude Code
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version: 2.0.0
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date: 2026-04-19
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---
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# Cluster Health Check
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## MANDATORY: Run the script first
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When this skill is invoked, your **first action** must be to run the
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cluster health check script and reason over its output before doing
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anything else. Do not improvise individual `kubectl` calls — the
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script is the authoritative surface.
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```bash
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cd /home/wizard/code
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bash infra/scripts/cluster_healthcheck.sh --json | tee /tmp/cluster-health.json
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```
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If the session is rooted elsewhere, fall back to the absolute path:
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```bash
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bash /home/wizard/code/infra/scripts/cluster_healthcheck.sh --json
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```
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Then:
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1. Parse the JSON. Report the PASS/WARN/FAIL counts + overall verdict.
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2. Iterate every FAIL and WARN check, describe what tripped, and propose
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the remediation path (use the recipes below).
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3. Only reach for ad-hoc `kubectl` commands when investigating a
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specific failure beyond what the script reported.
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Exit codes: `0` = healthy, `1` = warnings only, `2` = failures.
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## Quick flags
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```bash
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# Human-readable report (default), no auto-fix
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bash infra/scripts/cluster_healthcheck.sh
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# Machine-readable JSON summary
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bash infra/scripts/cluster_healthcheck.sh --json
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# Only show WARN + FAIL (suppress PASS noise)
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bash infra/scripts/cluster_healthcheck.sh --quiet
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# Enable auto-fix (delete evicted pods, kick stuck CrashLoop pods)
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bash infra/scripts/cluster_healthcheck.sh --fix
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# Combined: quiet JSON without auto-fix
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bash infra/scripts/cluster_healthcheck.sh --no-fix --quiet --json
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# Custom kubeconfig
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bash infra/scripts/cluster_healthcheck.sh --kubeconfig /path/to/config
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```
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## What It Checks (47 checks)
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| # | Check | Notes |
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|---|-------|-------|
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| 1 | Node Status | NotReady nodes, version drift |
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| 2 | Node Resources | CPU/mem >80% (warn) / >90% (fail) |
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| 3 | Node Conditions | MemoryPressure / DiskPressure / PIDPressure |
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| 4 | Problematic Pods | CrashLoopBackOff / Error / ImagePullBackOff |
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| 5 | Evicted/Failed Pods | `status.phase=Failed` |
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| 6 | DaemonSets | desired == ready |
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| 7 | Deployments | ready == desired replicas |
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| 8 | PVC Status | all Bound |
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| 9 | HPA Health | targets not `<unknown>`, utilization <100% |
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| 10 | CronJob Failures | job conditions `Failed=True` in last 24h |
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| 11 | CrowdSec Agents | all pods Running |
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| 12 | Ingress Routes | every ingress has an LB IP + Traefik LB |
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| 13 | Prometheus Alerts | count of firing alerts |
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| 14 | Uptime Kuma Monitors | internal + external monitors up |
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| 15 | ResourceQuota Pressure | any quota >80% used |
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| 16 | StatefulSets | ready == desired |
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| 17 | Node Disk Usage | ephemeral-storage <80% |
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| 18 | Helm Release Health | all `deployed` (no `pending-*`) |
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| 19 | Kyverno Policy Engine | all pods Running |
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| 20 | NFS Connectivity | 192.168.1.127 showmount / port 2049 |
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| 21 | DNS Resolution | Technitium resolves internal + external |
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| 22 | TLS Certificate Expiry | TLS `Secret` certs >30d valid |
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| 23 | GPU Health | nvidia namespace + device-plugin Running |
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| 24 | Cloudflare Tunnel | pods Running |
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| 25 | Resource Usage | node CPU/mem headroom |
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| 26 | HA Sofia — Entity Availability | Home Assistant unavailable/unknown count |
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| 27 | HA Sofia — Integration Health | config entries setup_error / not_loaded |
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| 28 | HA Sofia — Automation Status | disabled / stale (>30d) automations |
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| 29 | HA Sofia — System Resources | HA CPU / mem / disk |
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| 30 | Hardware Exporters | snmp / idrac-redfish / proxmox / tuya pods + scrapes |
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| 31 | cert-manager — Certificate Readiness | Certificate CRs with `Ready!=True` |
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| 32 | cert-manager — Certificate Expiry (<14d) | notAfter within 14d |
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| 33 | cert-manager — Failed CertificateRequests | `Ready=False, reason=Failed` |
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| 34 | Backup Freshness — Per-DB Dumps | MySQL + PG dumps within 25h |
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| 35 | Backup Freshness — Offsite Sync | Pushgateway `backup_last_success_timestamp` <27h |
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| 36 | Backup Freshness — LVM PVC Snapshots | newest thin snapshot <25h (SSH PVE) |
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| 37 | Monitoring — Prometheus + Alertmanager | `/-/ready` + AM pods Running |
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| 38 | Monitoring — Vault Sealed Status | `vault status` reports `Sealed: false` |
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| 39 | Monitoring — ClusterSecretStore Ready | `vault-kv` + `vault-database` Ready |
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| 40 | External — Cloudflared + Authentik Replicas | deployments fully ready |
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| 41 | External — ExternalAccessDivergence Alert | alert not firing |
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| 42 | External — Traefik 5xx Rate (15m) | top-10 services emitting 5xx |
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| 43 | PVE Host Thermals | package + per-core temps via `/sys/class/hwmon` (SSH). Baseline 55-65 °C. PASS <65 °C, WARN 65-82 °C (a VM is burning too much CPU), FAIL ≥83 °C (TjMax) |
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| 44 | PVE Host Load | `/proc/loadavg` via SSH. PASS 5m <30, WARN 30-37, FAIL ≥38 of 44 threads |
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| 45 | HA Sofia — Status Dashboard | emo's curated Барзини → Статус view (`dashboard-barzini` / path `status`). Pulls the lovelace config via WS, batch-renders every `custom:mushroom-template-card` secondary template against `/api/template`, classifies each rendered line: FAIL on `Offline` / `Disconnected` / `Разкачен` / `— No data`; WARN on `⚠️` / `Abnormal` / `Trouble (` / `(ниска)` / `Пълен резервоар` / `Грешка` / `attention` / `Внимание`. Verdict rolls up across the 8 sections (Сигурност, Мрежа & IT, Енергия, Климат, Уреди, Мултимедия, Осветление, Поливна) |
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| 46 | Immich Smart Search | `clip_index` residency in PG `shared_buffers` + representative ANN probe latency (in immich-postgresql). FAIL >1.5s or <50% resident; WARN >0.5s or <90% resident. Cold cache → check `clip-index-prewarm` CronJob |
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| 47 | Proxmox CSI — Ghost-Disk Drift | Per node, compares real virtio-scsi CSI disks in `qm config <vmid>` (SSH PVE) vs attached proxmox-CSI VolumeAttachments k8s tracks. Catches orphaned "ghost" disks left by failed detaches (`query-pci` QMP timeouts) that the scheduler's 28-LUN guard can't see. PASS reconciled; WARN drift>0 or real 20-24; FAIL real ≥25 (near LUN cap → imminent wedge). Cleanup: detach ghosts via `qm set <vmid> --delete scsiN` (frees slot, retains LV) |
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## Safe Auto-Fix Rules
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`--fix` only performs operations that are genuinely reversible and
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observable. Nothing here rewrites Terraform state or mutates the cluster
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beyond "delete pod".
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### Done automatically by `--fix`
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- **Evicted / Failed pods** — delete them; the controller recreates.
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```bash
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kubectl delete pods -A --field-selector=status.phase=Failed
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```
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- **CrashLoopBackOff pods with >10 restarts** — delete once to reset
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backoff timer.
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### NEVER auto-fix (requires human investigation)
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- NotReady nodes
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- MemoryPressure / DiskPressure / PIDPressure
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- ImagePullBackOff (usually a bad tag / registry credential)
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- Deployment ready-replica mismatch
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- Pending PVCs
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- Node CPU/memory >90%
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- CronJob failures
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- DaemonSet desired != ready
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- Vault sealed
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- ClusterSecretStore not Ready
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- cert-manager Certificate failures
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- Backup freshness regressions
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- Any external-reachability failure
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## Deep-investigation recipes per failure mode
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### Node Issues (checks 1, 3, 17, 25)
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```bash
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kubectl describe node <node>
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kubectl top nodes
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kubectl get events --field-selector involvedObject.name=<node> --sort-by='.lastTimestamp'
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# SSH to the node
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ssh root@10.0.20.10X
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systemctl status kubelet
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journalctl -u kubelet --since "30 minutes ago" | tail -100
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df -h ; free -h
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```
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Node IPs: `10.0.20.100` master, `.101` node1 (GPU), `.102` node2,
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`.103` node3, `.104` node4.
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### Pod Issues (checks 4, 5, 11, 19)
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```bash
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kubectl describe pod -n <ns> <pod>
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kubectl logs -n <ns> <pod> --tail=200
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kubectl logs -n <ns> <pod> --previous --tail=200
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kubectl get events -n <ns> --sort-by='.lastTimestamp' | tail -20
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```
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Common failure causes: OOMKilled (raise mem limit in Terraform), bad
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config / missing env var, DB connection failure (check `dbaas` pods),
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NFS mount failure (`showmount -e 192.168.1.127`), stale
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imagePullSecret.
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### Deployment / StatefulSet / DaemonSet (checks 6, 7, 16)
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```bash
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kubectl describe deployment -n <ns> <name>
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kubectl rollout status deployment -n <ns> <name>
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kubectl rollout history deployment -n <ns> <name>
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kubectl get rs -n <ns> -l app=<app>
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```
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### PVC (check 8)
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```bash
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kubectl describe pvc -n <ns> <pvc>
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kubectl get events -n <ns> --field-selector reason=FailedMount --sort-by='.lastTimestamp'
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kubectl get pv | grep <pvc>
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showmount -e 192.168.1.127
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```
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### cert-manager (checks 31, 32, 33)
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```bash
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kubectl get certificate -A
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kubectl describe certificate -n <ns> <name>
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kubectl get certificaterequest -A
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kubectl describe certificaterequest -n <ns> <name>
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kubectl logs -n cert-manager deploy/cert-manager | tail -50
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```
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Common causes: ACME HTTP-01 challenge blocked, ClusterIssuer missing
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DNS provider secret, rate-limit from Let's Encrypt.
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### Backups (checks 34, 35, 36)
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```bash
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# Per-DB dumps (inside the DB pod)
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kubectl exec -n dbaas mysql-standalone-0 -- ls -lah /backup/per-db/
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kubectl exec -n dbaas pg-cluster-0 -- ls -lah /backup/per-db/
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# Pushgateway metrics
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kubectl exec -n monitoring deploy/prometheus-server -- \
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wget -qO- http://prometheus-prometheus-pushgateway:9091/metrics | \
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grep backup_last_success_timestamp
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# LVM snapshots on PVE host
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ssh -o BatchMode=yes root@192.168.1.127 \
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'lvs -o lv_name,lv_time,lv_size --noheadings | grep snap'
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```
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If offsite sync is stale, the common cause is the
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`offsite-sync-backup.service` systemd unit on the PVE host failing.
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`ssh root@192.168.1.127 'systemctl status offsite-sync-backup'`.
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### Monitoring stack (checks 37, 38, 39)
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```bash
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# Prometheus
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kubectl exec -n monitoring deploy/prometheus-server -- wget -qO- http://localhost:9090/-/ready
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kubectl logs -n monitoring deploy/prometheus-server --tail=100
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# Alertmanager
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kubectl get pods -n monitoring | grep alertmanager
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kubectl logs -n monitoring -l app=prometheus-alertmanager --tail=100
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# Vault
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kubectl exec -n vault vault-0 -- sh -c 'VAULT_ADDR=http://127.0.0.1:8200 vault status'
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# If sealed: check raft peers with `vault operator raft list-peers` and unseal.
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# ClusterSecretStore
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kubectl get clustersecretstore
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kubectl describe clustersecretstore vault-kv vault-database
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kubectl logs -n external-secrets deploy/external-secrets --tail=100
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```
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### External reachability (checks 40, 41, 42)
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```bash
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# Cloudflared
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kubectl get pods -n cloudflared
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kubectl logs -n cloudflared -l app=cloudflared --tail=100
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# Authentik (Helm chart names the deployment goauthentik-server)
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kubectl get deployment -n authentik goauthentik-server
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kubectl logs -n authentik deploy/goauthentik-server --tail=100
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# ExternalAccessDivergence alert
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kubectl exec -n monitoring deploy/prometheus-server -- \
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wget -qO- 'http://localhost:9090/api/v1/alerts' | \
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python3 -m json.tool | grep -A 5 ExternalAccessDivergence
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# Traefik 5xx — find the hot service
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kubectl exec -n monitoring deploy/prometheus-server -- \
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wget -qO- 'http://localhost:9090/api/v1/query?query=topk(10,rate(traefik_service_requests_total{code=~%225..%22}%5B15m%5D))' \
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| python3 -m json.tool
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```
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### OOMKilled remediation
|
||||||
|
|
||||||
|
1. `kubectl describe pod -n <ns> <pod> | grep -A 5 Limits`
|
||||||
|
2. Edit `infra/modules/kubernetes/<service>/main.tf` and raise
|
||||||
|
`resources.limits.memory`.
|
||||||
|
3. `cd /home/wizard/code/infra && scripts/tg apply` (Tier 1) or
|
||||||
|
`terraform apply -target=module.<service>` as appropriate.
|
||||||
|
|
||||||
|
### ImagePullBackOff remediation
|
||||||
|
|
||||||
|
1. `kubectl describe pod -n <ns> <pod> | grep -A 5 Events`
|
||||||
|
2. Verify tag exists on the source registry.
|
||||||
|
3. Check pull-through cache at `10.0.20.10:{5000,5010,5020,5030}`.
|
||||||
|
4. Update the image tag in Terraform + re-apply.
|
||||||
|
|
||||||
|
### Persistent CrashLoopBackOff after auto-fix
|
||||||
|
|
||||||
|
1. `kubectl logs -n <ns> <pod> --previous --tail=200`
|
||||||
|
2. `kubectl describe pod -n <ns> <pod>` and check Last State:
|
||||||
|
- `OOMKilled` → raise memory limit
|
||||||
|
- Exit code 137 → OOM or probe killed
|
||||||
|
- Exit code 143 → SIGTERM / graceful shutdown failed
|
||||||
|
3. Cross-check dbaas + NFS + secrets are healthy.
|
||||||
|
|
||||||
|
## Performance forensics — top consumers + optimization hints
|
||||||
|
|
||||||
|
When the cluster is healthy (script returns 0) but the host is hot or load
|
||||||
|
is elevated, switch from "what broke?" to "what's expensive?". Run these
|
||||||
|
in order; stop as soon as the root cause is obvious.
|
||||||
|
|
||||||
|
### Step 1 — Snapshot top consumers cluster-wide
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Top 15 pods by current CPU
|
||||||
|
kubectl top pods --all-namespaces --sort-by=cpu --no-headers | head -15
|
||||||
|
|
||||||
|
# Top 5 nodes by CPU + memory pressure
|
||||||
|
kubectl top nodes
|
||||||
|
|
||||||
|
# Top 15 by 5-min rolling rate (smoothed — kills noise from one-off spikes)
|
||||||
|
kubectl -n monitoring exec deploy/prometheus-server -- wget -qO- \
|
||||||
|
"http://localhost:9090/api/v1/query?query=topk(15,sum%20by%20(namespace,pod)%20(rate(container_cpu_usage_seconds_total%7Bcontainer!%3D''%7D%5B5m%5D)))" \
|
||||||
|
| python3 -m json.tool | head -80
|
||||||
|
```
|
||||||
|
|
||||||
|
### Step 2 — For each suspect pod, get the WHY
|
||||||
|
|
||||||
|
For every pod in the top-N, gather these BEFORE proposing a fix:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
NS=<namespace>; POD=<pod>; CONT=$(kubectl -n $NS get pod $POD -o jsonpath='{.spec.containers[0].name}')
|
||||||
|
|
||||||
|
# What it does (image + command)
|
||||||
|
kubectl -n $NS get pod $POD -o jsonpath='{.spec.containers[0].image}{"\n"}{.spec.containers[0].args}{"\n"}'
|
||||||
|
|
||||||
|
# Resource limits + current usage
|
||||||
|
kubectl -n $NS top pod $POD --containers
|
||||||
|
kubectl -n $NS get pod $POD -o jsonpath='{.spec.containers[0].resources}'
|
||||||
|
|
||||||
|
# Recent logs filtered for reconcile loops, watch storms, slow queries
|
||||||
|
kubectl -n $NS logs $POD -c $CONT --tail=200 --since=5m 2>&1 \
|
||||||
|
| grep -iE 'reconcil|watch|scrape|index|loop|retry|slow|timeout' | tail -20
|
||||||
|
|
||||||
|
# Restart count + recent OOM
|
||||||
|
kubectl -n $NS describe pod $POD | grep -E 'Restart Count|Last State|Reason'
|
||||||
|
|
||||||
|
# Self-exported metrics (for apps that publish on /metrics)
|
||||||
|
kubectl -n $NS exec $POD -c $CONT -- wget -qO- localhost:<port>/metrics 2>/dev/null | head -50
|
||||||
|
```
|
||||||
|
|
||||||
|
### Step 3 — apiserver / etcd specific deep-dive (when control-plane is hot)
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Top request producers by verb+resource (last 30 min)
|
||||||
|
kubectl -n monitoring exec deploy/prometheus-server -- wget -qO- \
|
||||||
|
"http://localhost:9090/api/v1/query?query=topk(15,sum%20by%20(resource,verb)%20(rate(apiserver_request_total%5B30m%5D)))" \
|
||||||
|
| python3 -m json.tool
|
||||||
|
|
||||||
|
# Top user agents (which clients are hammering)
|
||||||
|
kubectl -n monitoring exec deploy/prometheus-server -- wget -qO- \
|
||||||
|
"http://localhost:9090/api/v1/query?query=topk(15,sum%20by%20(user_agent)%20(rate(apiserver_request_total%5B30m%5D)))" \
|
||||||
|
| python3 -m json.tool
|
||||||
|
|
||||||
|
# Long-running requests (WATCH / CONNECT — log streams, pod-watchers)
|
||||||
|
kubectl -n monitoring exec deploy/prometheus-server -- wget -qO- \
|
||||||
|
"http://localhost:9090/api/v1/query?query=apiserver_longrunning_requests" \
|
||||||
|
| python3 -m json.tool
|
||||||
|
|
||||||
|
# etcd write rate + DB size
|
||||||
|
kubectl -n monitoring exec deploy/prometheus-server -- wget -qO- \
|
||||||
|
"http://localhost:9090/api/v1/query?query=rate(etcd_disk_wal_fsync_duration_seconds_count%5B5m%5D)" \
|
||||||
|
| python3 -m json.tool
|
||||||
|
```
|
||||||
|
|
||||||
|
### Step 4 — PVE host specific deep-dive (when temp / load is high)
|
||||||
|
|
||||||
|
Checks 43 + 44 capture package temp + 5-min load avg with PASS/WARN/FAIL
|
||||||
|
thresholds — that's the first stop. When those WARN or FAIL, the
|
||||||
|
follow-up commands below trace which VM / process is the source:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Per-core temps (broader than the package summary in check 43)
|
||||||
|
ssh root@192.168.1.127 'for f in /sys/class/hwmon/hwmon0/temp*_input; do
|
||||||
|
base=${f%_input}; label=$(cat ${base}_label 2>/dev/null || echo "${base##*/}")
|
||||||
|
val=$(cat "$f"); echo " $label: $((val/1000))°C"
|
||||||
|
done'
|
||||||
|
|
||||||
|
# Per-VM CPU (each VM = one kvm process)
|
||||||
|
ssh root@192.168.1.127 'top -bn1 -o %CPU | grep kvm | head -10'
|
||||||
|
|
||||||
|
# pvestatd anomaly check — bursts > 50% usually mean LV count > 1000
|
||||||
|
ssh root@192.168.1.127 'lvs --noheadings 2>/dev/null | wc -l'
|
||||||
|
|
||||||
|
# Stale snapshots (any '_pre-*' that survived past their rollback window)
|
||||||
|
ssh root@192.168.1.127 'lvs --noheadings -o lv_name 2>/dev/null | awk "/_pre-/" | head -20'
|
||||||
|
```
|
||||||
|
|
||||||
|
### Step 5 — Optimization decision
|
||||||
|
|
||||||
|
For each consumer in the top-N, fill in a row:
|
||||||
|
|
||||||
|
| Pod / Process | CPU (m) | Why busy | Tunable | Est saving | Trade-off | Effort |
|
||||||
|
|---|---|---|---|---|---|---|
|
||||||
|
|
||||||
|
Then rank by ROI (saving / effort) and surface the top 3-5. **Hold back the ones where saving < 50m unless effort is also < 5 min.**
|
||||||
|
|
||||||
|
### Common causes + tunables (catalogue)
|
||||||
|
|
||||||
|
| Symptom | Likely cause | Tunable |
|
||||||
|
|---|---|---|
|
||||||
|
| **`kube-apiserver` > 1 core sustained** | `CONNECT pods/log` streams from `alloy`/`promtail` using apiserver-tail; OR Kyverno PolicyReport churn (background+enforce mode); OR VPA fanout (309 VPAs cause ~7 req/s) | Switch alloy/promtail to `loki.source.file`; raise Kyverno `backgroundScanInterval`; reduce VPA count |
|
||||||
|
| **`pvestatd` 70-100% bursts** | LV metadata scan over > 1000 LVs (typically stale `_pre-*` snapshots from ad-hoc node ops) | Delete stale snapshots; `/usr/local/bin/lvm-pvc-snapshot prune` |
|
||||||
|
| **Frigate > 2 cores** | Birdseye `mode: continuous` (16% on frigate.output); LPR debug; debug logging; too many active cameras × detect.fps | `birdseye.mode: motion`; `lpr.debug_save_plates: false`; remove debug loggers |
|
||||||
|
| **`vault-0` looping ERRORs every ~10s** | DB static-role not in connection's `allowed_roles` list (drift between role and connection) | Add role to `vault_database_secret_backend_connection.*.allowed_roles` in TF |
|
||||||
|
| **Alloy DS > 100m/pod** | `loki.source.kubernetes` (apiserver-tail) instead of `loki.source.file` | Switch to file-tail (~5× drop per pod) |
|
||||||
|
| **Prometheus default 1m scrape** | Chart default; new sample every minute | Raise `server.global.scrape_interval` to 2m; pin critical jobs (snmp-ups) to 30s; bump `for: 1m` alerts to `for: 3m` |
|
||||||
|
| **`kube-controller-manager` periodic ERROR loop** | Aggregated APIService discovery fails (calico/metrics-server unreachable, OR stuck Terminating pod still in endpoints) | Force-delete stuck pod; verify APIService Available; check pod runc bug on k8s-master |
|
||||||
|
| **etcd write > 1 MB/s** | PolicyReport thrash, too-frequent secret rotation, or audit log mode = RequestResponse | Trim Kyverno reports config; raise rotation_period; downgrade audit policy to Metadata for noisy resources |
|
||||||
|
|
||||||
|
### What NOT to touch
|
||||||
|
|
||||||
|
- **calico-node, etcd write rate, kube-controller-manager core work, pg-cluster replication** — structural cost, touching them risks correctness.
|
||||||
|
- **Pods doing legitimate request-serving work** (web servers, databases under load) — optimize the workload, not the runtime.
|
||||||
|
- **Anything where Goldilocks VPA upperBound is already close to current request** — no headroom to cut.
|
||||||
|
|
||||||
|
### Source-of-truth notes
|
||||||
|
|
||||||
|
- **All infra mutations go via Terraform** (`scripts/tg plan/apply`). The recipes above are diagnostic; the FIX lives in `infra/stacks/<name>/main.tf` or chart values.
|
||||||
|
- **Pod-internal config files** (e.g., Frigate's `/config/config.yml` on a PVC) are not TF-managed — edit in-pod and document in `infra/docs/runbooks/`.
|
||||||
|
- **PVE host-level state** (LVM snapshots, pvestatd) — SSH + manual ops; record in memory if the pattern recurs.
|
||||||
|
|
||||||
|
## Notes on the canonical / hardlink setup
|
||||||
|
|
||||||
|
The authoritative copy of this SKILL.md lives at
|
||||||
|
`/home/wizard/code/.claude/skills/cluster-health/SKILL.md`. A hardlink
|
||||||
|
at `/home/wizard/code/infra/.claude/skills/cluster-health/SKILL.md`
|
||||||
|
points to the same inode so infra-rooted sessions also discover the
|
||||||
|
skill.
|
||||||
|
|
||||||
|
To verify the hardlink is intact:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
stat -c '%i %n' \
|
||||||
|
/home/wizard/code/.claude/skills/cluster-health/SKILL.md \
|
||||||
|
/home/wizard/code/infra/.claude/skills/cluster-health/SKILL.md
|
||||||
|
```
|
||||||
|
|
||||||
|
Both should print the same inode number. If they diverge (e.g. `git
|
||||||
|
checkout` replaced the file rather than updating it), re-link:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
ln -f /home/wizard/code/.claude/skills/cluster-health/SKILL.md \
|
||||||
|
/home/wizard/code/infra/.claude/skills/cluster-health/SKILL.md
|
||||||
|
```
|
||||||
Loading…
Add table
Add a link
Reference in a new issue