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Viktor Barzin 1de2ee307f kyverno: strip resources.limits.cpu cluster-wide via ClusterPolicy 
Context
-------
The cluster policy is "no CPU limits anywhere" — CFS throttling causes
more harm than good for bursty single-threaded workloads (Node.js,
Python). LimitRanges are already correct (defaultRequest.cpu only, no
default.cpu), but 22 pods still carried CPU limits injected by upstream
Helm chart defaults — CrowdSec (lapi + agents), descheduler,
kubernetes-dashboard (×4), nvidia gpu-operator.

Previous attempts were ad-hoc: patch each values.yaml, occasionally
missing things on chart upgrade. This replaces that with a declarative
Kyverno mutation at admission time.

This change
-----------
Adds a new ClusterPolicy `strip-cpu-limits` with two foreach rules:

  strip-container-cpu-limit      → containers[]
  strip-initcontainer-cpu-limit  → initContainers[]

Each rule uses `patchesJson6902` with an `op: remove` on
`resources/limits/cpu`. JSON6902 `remove` fails on missing paths, so
per-element preconditions gate the mutation — pods without CPU limits
pass through untouched. A top-level rule precondition short-circuits
using JMESPath filter (`[?resources.limits.cpu != null] | length(@) > 0`)
so the mutation is a no-op for the overwhelming majority of pods.

Admission-time only. No `mutateExistingOnPolicyUpdate`, no `background`.
Existing pods keep their CPU limits until they're restarted naturally
(Helm upgrade, node drain, rollout). We rely on churn, not forced
restarts, to avoid unnecessary thrash.

Memory limits are preserved — they prevent OOM, still useful.

Flow
----

    admission request → match Pod + CREATE
                     → top-level precondition: any container has limits.cpu?
                           no  → skip (fast path)
                           yes → foreach container:
                                   element.limits.cpu present?
                                       no  → skip element
                                       yes → remove /spec/containers/N/resources/limits/cpu
                     → same again for initContainers
                     → mutated pod proceeds to API server

Verification
------------
  kubectl run test-strip-cpu --overrides='{limits:{cpu:500m,memory:64Mi}}'
    → admitted pod.resources = {limits:{memory:64Mi}, requests:{cpu:50m,memory:32Mi}}
    → CPU limit stripped, memory preserved, requests untouched

  kubectl rollout restart deploy/kubernetes-dashboard-metrics-scraper
    → new pod.resources = {limits:{memory:400Mi}, requests:{cpu:100m,memory:200Mi}}
    → cluster-wide count of pods with CPU limits: 22 → 21

Rollout
-------
Remaining 21 pods will drop their CPU limits on natural churn. No manual
restarts in this change — user may want to time a mass restart with a
maintenance window.

Closes: code-eaf
Closes: code-4bz

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-18 11:34:39 +00:00
..
_template [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
actualbudget [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
affine [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
authentik [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
beads-server Add broker-sync Terraform stack (#7) 2026-04-17 21:17:45 +01:00
blog [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
broker-sync Add broker-sync Terraform stack (#7) 2026-04-17 21:17:45 +01:00
changedetection [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
city-guesser [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
claude-memory Add broker-sync Terraform stack (#7) 2026-04-17 21:17:45 +01:00
cloudflared [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
cnpg [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
coturn [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
crowdsec [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
cyberchef [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
dashy [cleanup] Remove ollama from dashy + docs + nfs_directories 2026-04-18 11:17:59 +00:00
dawarich [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
dbaas [dbaas] Fix mysql_static_user heredoc quoting 2026-04-17 22:34:12 +00:00
descheduler [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
diun [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
ebook2audiobook [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
ebooks [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
echo [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
excalidraw [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
external-secrets [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
f1-stream [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
foolery Add broker-sync Terraform stack (#7) 2026-04-17 21:17:45 +01:00
forgejo [forgejo] Probe /api/healthz for external monitor 2026-04-17 22:06:23 +00:00
freedify [freedify] Remove stale sed patches from container startup 2026-04-17 06:17:13 +00:00
freshrss [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
frigate [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
grampsweb [grampsweb] Remove ollama_host source refs (apply blocked by bd-w97) 2026-04-18 11:14:01 +00:00
hackmd [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
headscale [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
health [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
hermes-agent [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
homepage [cleanup] Remove ollama from dashy + docs + nfs_directories 2026-04-18 11:17:59 +00:00
immich [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
infra [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
infra-maintenance [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
insta2spotify [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
iscsi-csi [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
isponsorblocktv [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
jsoncrack [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
k8s-dashboard [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
k8s-portal [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
kms [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
kyverno kyverno: strip resources.limits.cpu cluster-wide via ClusterPolicy 2026-04-18 11:34:39 +00:00
linkwarden [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
mailserver [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
matrix [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
meshcentral [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
metallb [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
metrics-server [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
monitoring [monitoring] Remove stale MySQL InnoDB Cluster alerts 2026-04-18 10:03:58 +00:00
n8n [n8n] Fix broken DIUN auto-upgrade pipeline — missing auth token to claude-agent-service 2026-04-18 10:41:09 +00:00
navidrome [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
netbox [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
networking-toolbox [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
nextcloud [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
nfs-csi [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
novelapp [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
ntfy [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
nvidia [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
onlyoffice [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
openclaw [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
osm_routing [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
owntracks [storage] Fix owntracks + wealthfolio: switch to encrypted PVCs 2026-04-17 20:29:57 +00:00
paperless-ngx [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
phpipam [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
platform [infra] Add Cloudflare provider to all stack lock files and generated providers 2026-04-16 16:31:36 +00:00
plotting-book [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
poison-fountain [infra] Scale down unused services + remove DoH ingress 2026-04-17 18:55:52 +00:00
priority-pass [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
privatebin [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
proxmox-csi feat(storage): migrate all sensitive services to proxmox-lvm-encrypted 2026-04-15 20:15:30 +00:00
pvc-autoresizer fix: disable cert-manager webhook for pvc-autoresizer, use self-signed cert [ci skip] 2026-04-03 23:44:49 +03:00
rbac [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
real-estate-crawler [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
redis [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
reloader [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
resume [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
reverse-proxy [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
rybbit [rybbit] Remove ollama favicon cache entry (deploy on next manual wrangler) 2026-04-18 11:14:38 +00:00
sealed-secrets [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
send [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
servarr [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
shadowsocks [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
speedtest [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
status-page [alerts] Fix status-page-pusher crash + Prometheus backup push 2026-04-17 18:29:43 +00:00
stirling-pdf [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
tandoor [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
technitium [infra] Scale down unused services + remove DoH ingress 2026-04-17 18:55:52 +00:00
terminal Add broker-sync Terraform stack (#7) 2026-04-17 21:17:45 +01:00
tor-proxy [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
trading-bot [trading-bot] Remove ollama refs from commented-out source 2026-04-18 11:14:22 +00:00
traefik [traefik] Remove ollama-tcp entrypoint 2026-04-18 11:12:59 +00:00
travel_blog [infra] Scale down unused services + remove DoH ingress 2026-04-17 18:55:52 +00:00
tuya-bridge [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
uptime-kuma [uptime-kuma] Bump CPU + memory requests to reduce TTFB jitter 2026-04-18 11:11:39 +00:00
url [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
vault [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
vaultwarden [traefik] Remove broken rewrite-body plugin and all rybbit/anti-AI injection 2026-04-17 12:41:17 +00:00
vpa [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
wealthfolio [storage] Fix owntracks + wealthfolio: switch to encrypted PVCs 2026-04-17 20:29:57 +00:00
webhook_handler [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
whisper [whisper] Remove ollama_tcp IngressRouteTCP (ollama decom) 2026-04-18 11:11:21 +00:00
wireguard [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
woodpecker [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
xray [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
ytdlp [ytdlp] Remove ollama_host variable and fallback env vars 2026-04-18 11:13:42 +00:00