How do you implement resource quotas and limit ranges with Helm?

Resource quotas and limit ranges enforce resource constraints at namespace level, critical for multi-tenant clusters.

Resource Quota template: # templates/resourcequota.yaml {{- if .Values.resourceQuota.enabled }} apiVersion: v1 kind: ResourceQuota metadata: name: {{ include "myapp.fullname" . }}-quota spec: hard: requests.cpu: {{ .Values.resourceQuota.requests.cpu }} requests.memory: {{ .Values.resourceQuota.requests.memory }} limits.cpu: {{ .Values.resourceQuota.limits.cpu }} limits.memory: {{ .Values.resourceQuota.limits.memory }} persistentvolumeclaims: {{ .Values.resourceQuota.pvcs | default "10" }} pods: {{ .Values.resourceQuota.pods | default "20" }} services: {{ .Values.resourceQuota.services | default "10" }} secrets: {{ .Values.resourceQuota.secrets | default "50" }} configmaps: {{ .Values.resourceQuota.configmaps | default "50" }} {{- end }}

Limit Range for default requests: # templates/limitrange.yaml {{- if .Values.limitRange.enabled }} apiVersion: v1 kind: LimitRange metadata: name: {{ include "myapp.fullname" . }}-limits spec: limits: - type: Container default: cpu: {{ .Values.limitRange.default.cpu }} memory: {{ .Values.limitRange.default.memory }} defaultRequest: cpu: {{ .Values.limitRange.defaultRequest.cpu }} memory: {{ .Values.limitRange.defaultRequest.memory }} max: cpu: {{ .Values.limitRange.max.cpu }} memory: {{ .Values.limitRange.max.memory }} min: cpu: {{ .Values.limitRange.min.cpu }} memory: {{ .Values.limitRange.min.memory }} - type: Pod max: cpu: {{ .Values.limitRange.podMax.cpu }} memory: {{ .Values.limitRange.podMax.memory }} {{- end }}

Per-namespace quotas with values: # environments/dev/values.yaml resourceQuota: enabled: true requests: cpu: "2" memory: "4Gi" limits: cpu: "4" memory: "8Gi" pods: 10 # environments/prod/values.yaml resourceQuota: enabled: true requests: cpu: "10" memory: "20Gi" limits: cpu: "20" memory: "40Gi" pods: 50

Template validation with quota: # Check if quota allows new resources {{- $currentPods := lookup "v1" "Pod" .Release.Namespace "" | len -}} {{- $quotaPods := .Values.resourceQuota.pods | int -}} {{- if ge $currentPods $quotaPods }} {{- fail "Pod quota would be exceeded" -}} {{- end }}

Monitoring quota usage: # Get quota status kubectl get resourcequota -n mynamespace # Watch quota during deployment kubectl get resourcequota myapp-quota -n mynamespace -w # Alert on quota near limits (Prometheus) kubectl resourcequota used > 80%

Multi-tenant quota strategy: # Shared quota for teams team-a-quota: hard: pods: "50" requests.cpu: "10" requests.memory: 20Gi # Per-application quotas within team app-quota: hard: pods: "10" requests.cpu: "2"

Best practices: Always set LimitRange to provide default resource requests, set ResourceQuota high enough for rolling updates (2x peak usage), test quota exhaustion scenarios, and monitor quota usage with dashboards.

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