• When a pod is created the containers are assigned a default CPU request of .5 and memory of 256Mi
  • 기본적으로 k8s는 리소스 제한을 1 CPU 및 512Mi 메모리로 설정한다.
• pod 정의에서 리소스 제한을 설정할 수 있다.

---
apiVersion: v1
kind: Pod
metadata:
  name: elephant
  namespace: default
spec:
  containers:
  - args:
    - --vm
    - "1"
    - --vm-bytes
    - 15M
    - --vm-hang
    - "1"
    command:
    - stress
    image: polinux/stress
    name: mem-stress
    resources:
      limits:
        memory: 20Mi
      requests:
        memory: 5Mi

https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/memory-default-namespace/

apiVersion: v1
kind: LimitRange
metadata:
  name: cpu-limit-range
spec:
  limits:
  - default:
      cpu: 1
    defaultRequest:
      cpu: 0.5
    type: Containe

https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/cpu-default-namespace/

References:

https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource

resources:
  requests:
    cpu: 50m
    memory: 50Mi
  limits:
    cpu: 100m
    memory: 100Mi

• CPU 는 제한을 넘지 못하지만, 컨테이너는 제한 보다 많은 메모리 리소스를 이용할 수 있다.

• kubectl get po elephant -o yaml > elephant.yaml

  ---
  apiVersion: v1
  kind: Pod
  metadata:
    name: elephant
    namespace: default
  spec:
    containers:
    - args:
      - --vm
      - "1"
      - --vm-bytes
      - 15M
      - --vm-hang
      - "1"
      command:
      - stress
      image: polinux/stress
      name: mem-stress
      resources:
        limits:
          memory: 20Mi
        requests:
          memory: 5Mi