1de2ee307f
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>
1155 lines
33 KiB
HCL
1155 lines
33 KiB
HCL
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# =============================================================================
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# Tier-Based Resource Governance
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# =============================================================================
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# default (limit) = defaultRequest (request) to give Guaranteed QoS and prevent
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# memory overcommit. Changed 2026-03-14 after node2 OOM crash caused by 250%
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# memory overcommit (61GB limits on 24GB node).
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#
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# Four layers of protection against noisy neighbor issues:
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# 1. PriorityClasses - critical services survive resource pressure
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# 2. LimitRange defaults (Kyverno generate) - auto-inject defaults for containers without resources
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# 3. ResourceQuotas (Kyverno generate) - hard ceiling on namespace resource consumption
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# 4. Priority injection (Kyverno mutate) - set priorityClassName based on namespace tier label
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locals {
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governance_tiers = ["0-core", "1-cluster", "2-gpu", "3-edge", "4-aux"]
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excluded_namespaces = ["kube-system", "metallb-system", "kyverno", "calico-system", "calico-apiserver"]
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}
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# -----------------------------------------------------------------------------
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# Layer 1: PriorityClasses
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# -----------------------------------------------------------------------------
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# Values stay well below system-cluster-critical (2,000,000,000)
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resource "kubernetes_priority_class" "tier_0_core" {
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metadata {
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name = "tier-0-core"
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}
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value = 1000000
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global_default = false
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preemption_policy = "PreemptLowerPriority"
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description = "Critical infrastructure: ingress, DNS, VPN, auth, monitoring"
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}
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resource "kubernetes_priority_class" "tier_1_cluster" {
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metadata {
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name = "tier-1-cluster"
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}
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value = 800000
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global_default = false
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preemption_policy = "PreemptLowerPriority"
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description = "Cluster services: Redis, metrics, security"
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}
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resource "kubernetes_priority_class" "tier_2_gpu" {
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metadata {
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name = "tier-2-gpu"
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}
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value = 600000
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global_default = false
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preemption_policy = "PreemptLowerPriority"
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description = "GPU workloads: Immich, Ollama, Frigate"
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}
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resource "kubernetes_priority_class" "gpu_workload" {
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metadata {
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name = "gpu-workload"
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}
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value = 1200000
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global_default = false
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preemption_policy = "PreemptLowerPriority"
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description = "GPU-pinned workloads. Higher than all user tiers. Auto-injected by Kyverno on pods requesting nvidia.com/gpu."
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}
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resource "kubernetes_priority_class" "tier_3_edge" {
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metadata {
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name = "tier-3-edge"
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}
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value = 400000
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global_default = false
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preemption_policy = "PreemptLowerPriority"
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description = "User-facing services: mail, file sync, dashboards"
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}
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resource "kubernetes_priority_class" "tier_4_aux" {
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metadata {
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name = "tier-4-aux"
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}
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value = 200000
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global_default = false
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preemption_policy = "Never"
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description = "Optional services: blogs, tools, experiments. Will not preempt other aux services."
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}
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# -----------------------------------------------------------------------------
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# Layer 2: LimitRange Defaults (Kyverno Generate)
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# -----------------------------------------------------------------------------
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# Creates a LimitRange in each namespace based on its tier label.
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# Only affects containers WITHOUT explicit resource requests/limits.
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resource "kubernetes_manifest" "generate_limitrange_by_tier" {
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manifest = {
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apiVersion = "kyverno.io/v1"
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kind = "ClusterPolicy"
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metadata = {
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name = "generate-limitrange-by-tier"
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annotations = {
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"policies.kyverno.io/title" = "Generate LimitRange by Tier"
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"policies.kyverno.io/description" = "Creates tier-appropriate LimitRange defaults in namespaces based on their tier label. Only affects containers without explicit resource specifications. Excludes namespaces with resource-governance/custom-limitrange label."
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}
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}
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spec = {
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generateExisting = true
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rules = [
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# Tier 0-core
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{
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name = "limitrange-tier-0-core"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "0-core"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-limitrange" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "256Mi"
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}
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defaultRequest = {
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cpu = "100m"
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memory = "256Mi"
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}
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max = {
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memory = "8Gi"
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}
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}
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]
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}
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}
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}
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},
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# Tier 1-cluster
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{
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name = "limitrange-tier-1-cluster"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "1-cluster"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-limitrange" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "256Mi"
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}
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defaultRequest = {
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cpu = "100m"
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memory = "256Mi"
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}
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max = {
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memory = "8Gi"
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}
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}
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]
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}
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}
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}
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},
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# Tier 2-gpu
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{
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name = "limitrange-tier-2-gpu"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "2-gpu"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-limitrange" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "1Gi"
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}
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defaultRequest = {
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cpu = "200m"
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memory = "1Gi"
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}
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max = {
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memory = "16Gi"
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}
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}
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]
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}
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}
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}
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},
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# Tier 3-edge — Burstable QoS: request < limit to reduce scheduler pressure
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{
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name = "limitrange-tier-3-edge"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "3-edge"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-limitrange" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "256Mi"
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}
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defaultRequest = {
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cpu = "50m"
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memory = "128Mi"
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}
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max = {
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memory = "8Gi"
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}
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}
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]
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}
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}
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}
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},
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# Tier 4-aux — Burstable QoS: request < limit to reduce scheduler pressure
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{
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name = "limitrange-tier-4-aux"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "4-aux"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-limitrange" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "256Mi"
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}
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defaultRequest = {
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cpu = "50m"
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memory = "64Mi"
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}
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max = {
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memory = "4Gi"
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}
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}
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]
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}
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}
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}
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},
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# Fallback: namespaces without a tier label get aux-level defaults
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# requests = limits to prevent memory overcommit (2026-03-14 node2 OOM incident)
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{
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name = "limitrange-no-tier-fallback"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchExpressions = [
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{
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key = "tier"
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operator = "Exists"
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}
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]
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}
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}
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},
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{
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resources = {
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namespaces = ["kube-system", "metallb-system", "kyverno", "calico-system", "calico-apiserver"]
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "LimitRange"
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name = "tier-defaults"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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limits = [
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{
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type = "Container"
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default = {
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memory = "192Mi"
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}
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defaultRequest = {
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cpu = "50m"
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memory = "128Mi"
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}
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max = {
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memory = "4Gi"
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}
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}
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]
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}
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}
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}
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},
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]
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}
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}
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}
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# -----------------------------------------------------------------------------
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# Layer 3: ResourceQuotas (Kyverno Generate)
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# -----------------------------------------------------------------------------
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# Creates a ResourceQuota in each namespace based on its tier label.
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# Sets hard ceiling on total namespace resource consumption.
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# Namespaces with label resource-governance/custom-quota=true are excluded.
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#
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# IMPORTANT: LimitRange (Layer 2) must exist before ResourceQuota takes effect,
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# because ResourceQuota requires all pods to have resource requests set.
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resource "kubernetes_manifest" "generate_resourcequota_by_tier" {
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depends_on = [kubernetes_manifest.generate_limitrange_by_tier]
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manifest = {
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apiVersion = "kyverno.io/v1"
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kind = "ClusterPolicy"
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metadata = {
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name = "generate-resourcequota-by-tier"
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annotations = {
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"policies.kyverno.io/title" = "Generate ResourceQuota by Tier"
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"policies.kyverno.io/description" = "Creates tier-appropriate ResourceQuota in namespaces based on their tier label. Excludes namespaces with resource-governance/custom-quota label."
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}
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}
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spec = {
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generateExisting = true
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rules = [
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# Tier 0-core
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{
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name = "quota-tier-0-core"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "0-core"
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}
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}
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}
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}
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]
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}
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exclude = {
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any = [
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{
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resources = {
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selector = {
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matchLabels = {
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"resource-governance/custom-quota" = "true"
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}
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}
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}
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}
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]
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}
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generate = {
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synchronize = true
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apiVersion = "v1"
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kind = "ResourceQuota"
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name = "tier-quota"
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namespace = "{{request.object.metadata.name}}"
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data = {
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spec = {
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hard = {
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"requests.cpu" = "8"
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"requests.memory" = "8Gi"
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"limits.memory" = "64Gi"
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pods = "100"
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}
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}
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}
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}
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},
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# Tier 1-cluster
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{
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name = "quota-tier-1-cluster"
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match = {
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any = [
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{
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resources = {
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kinds = ["Namespace"]
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selector = {
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matchLabels = {
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tier = "1-cluster"
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}
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}
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}
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}
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]
|
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}
|
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exclude = {
|
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any = [
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{
|
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resources = {
|
|
selector = {
|
|
matchLabels = {
|
|
"resource-governance/custom-quota" = "true"
|
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}
|
|
}
|
|
}
|
|
}
|
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]
|
|
}
|
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generate = {
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synchronize = true
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apiVersion = "v1"
|
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kind = "ResourceQuota"
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name = "tier-quota"
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namespace = "{{request.object.metadata.name}}"
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data = {
|
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spec = {
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hard = {
|
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"requests.cpu" = "4"
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"requests.memory" = "4Gi"
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"limits.memory" = "32Gi"
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pods = "30"
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}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
# Tier 2-gpu
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{
|
|
name = "quota-tier-2-gpu"
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match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Namespace"]
|
|
selector = {
|
|
matchLabels = {
|
|
tier = "2-gpu"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
selector = {
|
|
matchLabels = {
|
|
"resource-governance/custom-quota" = "true"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
generate = {
|
|
synchronize = true
|
|
apiVersion = "v1"
|
|
kind = "ResourceQuota"
|
|
name = "tier-quota"
|
|
namespace = "{{request.object.metadata.name}}"
|
|
data = {
|
|
spec = {
|
|
hard = {
|
|
"requests.cpu" = "8"
|
|
"requests.memory" = "12Gi"
|
|
"limits.memory" = "32Gi"
|
|
pods = "40"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
# Tier 3-edge
|
|
{
|
|
name = "quota-tier-3-edge"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Namespace"]
|
|
selector = {
|
|
matchLabels = {
|
|
tier = "3-edge"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
selector = {
|
|
matchLabels = {
|
|
"resource-governance/custom-quota" = "true"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
generate = {
|
|
synchronize = true
|
|
apiVersion = "v1"
|
|
kind = "ResourceQuota"
|
|
name = "tier-quota"
|
|
namespace = "{{request.object.metadata.name}}"
|
|
data = {
|
|
spec = {
|
|
hard = {
|
|
"requests.cpu" = "4"
|
|
"requests.memory" = "4Gi"
|
|
"limits.memory" = "32Gi"
|
|
pods = "30"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
# Tier 4-aux
|
|
{
|
|
name = "quota-tier-4-aux"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Namespace"]
|
|
selector = {
|
|
matchLabels = {
|
|
tier = "4-aux"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
selector = {
|
|
matchLabels = {
|
|
"resource-governance/custom-quota" = "true"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
generate = {
|
|
synchronize = true
|
|
apiVersion = "v1"
|
|
kind = "ResourceQuota"
|
|
name = "tier-quota"
|
|
namespace = "{{request.object.metadata.name}}"
|
|
data = {
|
|
spec = {
|
|
hard = {
|
|
"requests.cpu" = "2"
|
|
"requests.memory" = "3Gi"
|
|
"limits.memory" = "16Gi"
|
|
pods = "20"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
]
|
|
}
|
|
}
|
|
}
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Layer 4: PriorityClassName Injection (Kyverno Mutate)
|
|
# -----------------------------------------------------------------------------
|
|
# Automatically sets priorityClassName on Pods based on their namespace's tier label.
|
|
# Skips pods that already have a priorityClassName set.
|
|
# Uses namespaceSelector instead of API calls — no round-trip to the API server.
|
|
|
|
resource "kubernetes_manifest" "mutate_priority_from_tier" {
|
|
manifest = {
|
|
apiVersion = "kyverno.io/v1"
|
|
kind = "ClusterPolicy"
|
|
metadata = {
|
|
name = "inject-priority-class-from-tier"
|
|
annotations = {
|
|
"policies.kyverno.io/title" = "Inject PriorityClass from Tier"
|
|
"policies.kyverno.io/description" = "Sets priorityClassName on Pods based on the namespace tier label. Skips pods that already have a priorityClassName."
|
|
}
|
|
}
|
|
spec = {
|
|
rules = [for tier in local.governance_tiers : {
|
|
name = "inject-priority-${tier}"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
operations = ["CREATE"]
|
|
namespaceSelector = {
|
|
matchLabels = {
|
|
tier = tier
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
namespaces = local.excluded_namespaces
|
|
}
|
|
}
|
|
]
|
|
}
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{request.object.spec.priorityClassName || ''}}"
|
|
operator = "Equals"
|
|
value = ""
|
|
}
|
|
]
|
|
}
|
|
mutate = {
|
|
patchesJson6902 = yamlencode([
|
|
{
|
|
op = "remove"
|
|
path = "/spec/priority"
|
|
},
|
|
{
|
|
op = "remove"
|
|
path = "/spec/preemptionPolicy"
|
|
},
|
|
{
|
|
op = "add"
|
|
path = "/spec/priorityClassName"
|
|
value = "tier-${tier}"
|
|
}
|
|
])
|
|
}
|
|
}]
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
# --- ndots:2 injection ---
|
|
# Kubernetes defaults to ndots:5, which causes 4 wasted NxDomain queries per
|
|
# external DNS lookup (search domain expansion). This policy injects ndots:2
|
|
# on all pods to reduce NxDomain flood while still allowing short-name service
|
|
# resolution (e.g. "redis.redis" has 1 dot, so it still expands).
|
|
resource "kubernetes_manifest" "mutate_ndots" {
|
|
manifest = {
|
|
apiVersion = "kyverno.io/v1"
|
|
kind = "ClusterPolicy"
|
|
metadata = {
|
|
name = "inject-ndots"
|
|
annotations = {
|
|
"policies.kyverno.io/title" = "Inject ndots:2 DNS Config"
|
|
"policies.kyverno.io/description" = "Sets ndots:2 on all Pods to reduce NxDomain query flood from search domain expansion. Skips pods that already have ndots configured."
|
|
}
|
|
}
|
|
spec = {
|
|
rules = [
|
|
{
|
|
name = "inject-ndots-2"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
namespaces = ["kube-system", "metallb-system", "kyverno", "calico-system", "calico-apiserver"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{ request.object.spec.dnsConfig.options || `[]` | [?name == 'ndots'] | length(@) }}"
|
|
operator = "Equals"
|
|
value = "0"
|
|
}
|
|
]
|
|
}
|
|
mutate = {
|
|
patchStrategicMerge = {
|
|
spec = {
|
|
dnsConfig = {
|
|
options = [
|
|
{
|
|
name = "ndots"
|
|
value = "2"
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Layer 5: GPU Workload Priority Override (Kyverno Mutate)
|
|
# -----------------------------------------------------------------------------
|
|
# Overrides the tier-based priorityClassName with gpu-workload for pods that
|
|
# actually request nvidia.com/gpu resources. This ensures GPU pods can preempt
|
|
# non-GPU pods on the GPU node, regardless of namespace tier.
|
|
# Runs after Layer 4 (tier injection), so it overrides the tier-based priority.
|
|
|
|
resource "kubernetes_manifest" "mutate_gpu_priority" {
|
|
manifest = {
|
|
apiVersion = "kyverno.io/v1"
|
|
kind = "ClusterPolicy"
|
|
metadata = {
|
|
name = "inject-gpu-workload-priority"
|
|
annotations = {
|
|
"policies.kyverno.io/title" = "Inject GPU Workload Priority"
|
|
"policies.kyverno.io/description" = "Overrides priorityClassName to gpu-workload for pods requesting nvidia.com/gpu resources. Runs after tier-based injection."
|
|
}
|
|
}
|
|
spec = {
|
|
rules = [
|
|
{
|
|
name = "gpu-priority-override"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
operations = ["CREATE"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
exclude = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
namespaces = local.excluded_namespaces
|
|
}
|
|
}
|
|
]
|
|
}
|
|
preconditions = {
|
|
any = [
|
|
{
|
|
key = "{{ request.object.spec.containers[].resources.requests.\"nvidia.com/gpu\" || '' }}"
|
|
operator = "NotEquals"
|
|
value = ""
|
|
},
|
|
{
|
|
key = "{{ request.object.spec.containers[].resources.limits.\"nvidia.com/gpu\" || '' }}"
|
|
operator = "NotEquals"
|
|
value = ""
|
|
}
|
|
]
|
|
}
|
|
mutate = {
|
|
patchesJson6902 = yamlencode([
|
|
{
|
|
op = "replace"
|
|
path = "/spec/priorityClassName"
|
|
value = "gpu-workload"
|
|
},
|
|
{
|
|
op = "replace"
|
|
path = "/spec/priority"
|
|
value = 1200000
|
|
},
|
|
{
|
|
op = "replace"
|
|
path = "/spec/preemptionPolicy"
|
|
value = "PreemptLowerPriority"
|
|
}
|
|
])
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Layer 5: Automatic Cleanup of Failed/Evicted Pods
|
|
# -----------------------------------------------------------------------------
|
|
# Deletes pods in Failed phase every hour, cluster-wide.
|
|
# Prevents stale evicted pods and failed CronJob pods from accumulating.
|
|
|
|
# Grant Kyverno cleanup controller permission to delete Pods
|
|
resource "kubernetes_cluster_role_v1" "kyverno_cleanup_pods" {
|
|
metadata {
|
|
name = "kyverno:cleanup-controller:pods"
|
|
labels = {
|
|
"app.kubernetes.io/part-of" = "kyverno"
|
|
"app.kubernetes.io/instance" = "kyverno"
|
|
}
|
|
}
|
|
rule {
|
|
api_groups = [""]
|
|
resources = ["pods"]
|
|
verbs = ["list", "watch", "delete"]
|
|
}
|
|
}
|
|
|
|
resource "kubernetes_cluster_role_binding_v1" "kyverno_cleanup_pods" {
|
|
metadata {
|
|
name = "kyverno:cleanup-controller:pods"
|
|
labels = {
|
|
"app.kubernetes.io/part-of" = "kyverno"
|
|
"app.kubernetes.io/instance" = "kyverno"
|
|
}
|
|
}
|
|
role_ref {
|
|
api_group = "rbac.authorization.k8s.io"
|
|
kind = "ClusterRole"
|
|
name = kubernetes_cluster_role_v1.kyverno_cleanup_pods.metadata[0].name
|
|
}
|
|
subject {
|
|
kind = "ServiceAccount"
|
|
name = "kyverno-cleanup-controller"
|
|
namespace = "kyverno"
|
|
}
|
|
}
|
|
|
|
resource "kubernetes_manifest" "cleanup_failed_pods" {
|
|
manifest = {
|
|
apiVersion = "kyverno.io/v2"
|
|
kind = "ClusterCleanupPolicy"
|
|
metadata = {
|
|
name = "cleanup-failed-pods"
|
|
annotations = {
|
|
"policies.kyverno.io/title" = "Cleanup Failed Pods"
|
|
"policies.kyverno.io/description" = "Automatically deletes pods in Failed phase (evicted, error, completed CronJob failures)."
|
|
}
|
|
}
|
|
spec = {
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
conditions = {
|
|
any = [
|
|
{
|
|
key = "{{ request.object.status.phase }}"
|
|
operator = "Equals"
|
|
value = "Failed"
|
|
}
|
|
]
|
|
}
|
|
schedule = "15 * * * *"
|
|
}
|
|
}
|
|
}
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Strip CPU Limits (Kyverno Mutate)
|
|
# -----------------------------------------------------------------------------
|
|
# Removes resources.limits.cpu from every container and initContainer at pod
|
|
# admission. Memory limits are preserved. Cluster policy: CFS throttling causes
|
|
# more harm than good for bursty single-threaded workloads (Node.js, Python
|
|
# apps). Upstream Helm charts (CrowdSec, descheduler, kubernetes-dashboard,
|
|
# nvidia gpu-operator) still ship CPU limits — this strips them declaratively
|
|
# so we don't have to fork values.yaml per chart.
|
|
#
|
|
# Scope: admission-time only. Existing pods keep their limits until restarted
|
|
# naturally (Helm upgrade, node drain, rollout). No mutateExistingOnPolicyUpdate.
|
|
#
|
|
# JSON6902 remove op fails on missing paths — per-element precondition gates
|
|
# the mutation so pods without CPU limits pass through untouched.
|
|
|
|
resource "kubernetes_manifest" "mutate_strip_cpu_limits" {
|
|
manifest = {
|
|
apiVersion = "kyverno.io/v1"
|
|
kind = "ClusterPolicy"
|
|
metadata = {
|
|
name = "strip-cpu-limits"
|
|
annotations = {
|
|
"policies.kyverno.io/title" = "Strip CPU Limits"
|
|
"policies.kyverno.io/description" = join("", [
|
|
"Removes resources.limits.cpu from every container and initContainer ",
|
|
"at pod admission. Memory limits are preserved. Cluster policy: CFS ",
|
|
"throttling causes more harm than good for bursty single-threaded ",
|
|
"workloads (Node.js, Python apps).",
|
|
])
|
|
}
|
|
}
|
|
spec = {
|
|
background = false
|
|
rules = [
|
|
{
|
|
name = "strip-container-cpu-limit"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
operations = ["CREATE"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{ request.object.spec.containers[?resources.limits.cpu != null] | length(@) }}"
|
|
operator = "GreaterThan"
|
|
value = 0
|
|
}
|
|
]
|
|
}
|
|
mutate = {
|
|
foreach = [
|
|
{
|
|
list = "request.object.spec.containers"
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{ element.resources.limits.cpu || '' }}"
|
|
operator = "NotEquals"
|
|
value = ""
|
|
}
|
|
]
|
|
}
|
|
patchesJson6902 = yamlencode([
|
|
{
|
|
op = "remove"
|
|
path = "/spec/containers/{{ elementIndex }}/resources/limits/cpu"
|
|
}
|
|
])
|
|
}
|
|
]
|
|
}
|
|
},
|
|
{
|
|
name = "strip-initcontainer-cpu-limit"
|
|
match = {
|
|
any = [
|
|
{
|
|
resources = {
|
|
kinds = ["Pod"]
|
|
operations = ["CREATE"]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{ request.object.spec.initContainers[?resources.limits.cpu != null] || `[]` | length(@) }}"
|
|
operator = "GreaterThan"
|
|
value = 0
|
|
}
|
|
]
|
|
}
|
|
mutate = {
|
|
foreach = [
|
|
{
|
|
list = "request.object.spec.initContainers"
|
|
preconditions = {
|
|
all = [
|
|
{
|
|
key = "{{ element.resources.limits.cpu || '' }}"
|
|
operator = "NotEquals"
|
|
value = ""
|
|
}
|
|
]
|
|
}
|
|
patchesJson6902 = yamlencode([
|
|
{
|
|
op = "remove"
|
|
path = "/spec/initContainers/{{ elementIndex }}/resources/limits/cpu"
|
|
}
|
|
])
|
|
}
|
|
]
|
|
}
|
|
},
|
|
]
|
|
}
|
|
}
|
|
}
|