Skip to content

Latest commit

 

History

History
118 lines (104 loc) · 2.63 KB

05-resource-quotas.md

File metadata and controls

118 lines (104 loc) · 2.63 KB
Raw

Scheduling

Back to overview

Resource Quotas

Aggregates the total usage within one namespace

Enfore Requests and Limits for Pods within a namespace.

  • limits.cpu: Across all pods in a non-terminal state, the sum of CPU limits cannot exceed this value.
  • limits.memory: Across all pods in a non-terminal state, the sum of memory limits cannot exceed this value.
  • requests.cpu: Across all pods in a non-terminal state, the sum of CPU requests cannot exceed this value.
  • requests.memory: Across all pods in a non-terminal state, the sum of memory requests cannot exceed this value.

Example Resource Quotas:

apiVersion: v1
kind: List
items:
  - apiVersion: v1
    kind: ResourceQuota
    metadata:
      name: pods-high
    spec:
      hard:
        cpu: "1000"
        memory: 200Gi
        pods: "10"
      scopeSelector:
        matchExpressions:
          - operator: In
            scopeName: PriorityClass
            values: ["high"]
  - apiVersion: v1
    kind: ResourceQuota
    metadata:
      name: pods-medium
    spec:
      hard:
        cpu: "10"
        memory: 20Gi
        pods: "10"
      scopeSelector:
        matchExpressions:
          - operator: In
            scopeName: PriorityClass
            values: ["medium"]
  - apiVersion: v1
    kind: ResourceQuota
    metadata:
      name: pods-low
    spec:
      hard:
        cpu: "5"
        memory: 10Gi
        pods: "10"
      scopeSelector:
        matchExpressions:
          - operator: In
            scopeName: PriorityClass
            values: ["low"]

Example Pod:

apiVersion: v1
kind: Pod
metadata:
  name: high-priority
spec:
  containers:
    - name: high-priority
      image: ubuntu
      command: ["/bin/sh"]
      args: ["-c", "while true; do echo hello; sleep 10;done"]
      resources:
        requests:
          memory: "10Gi"
          cpu: "500m"
        limits:
          memory: "10Gi"
          cpu: "500m"
  priorityClassName: high

Limit Range

LimitRange ensures resource usage per pod/container level. Also defines default values, if not explicitly specified in the deployment.

apiVersion: v1
kind: LimitRange
metadata:
  name: limit-mem-cpu-per-pod
spec:
  limits:
    - max:
        cpu: "800m"
        memory: "1Gi"
      min:
        cpu: "100m"
        memory: "99Mi"
      default:
        cpu: "700m"
        memory: "900Mi"
      defaultRequest:
        cpu: "110m"
        memory: "111Mi"
      type: Pod

References

https://kubernetes.io/docs/concepts/policy/resource-quotas/