3.4.15. LimitRange.yml¶

说明:

cpu: 500m   // 500 millicpus
等同
cpu: "0.5"

LimitRange是namespace级别的, 即在namespace中有一个LimitRange, 则此namespace下创建pod时会自动加上LimitRange上的限制。

apiVersion: v1
kind: LimitRange
metadata:
  name: example
spec:
  limits:
  - type: Pod
    min:
      cpu: 50m
      memory: 5Mi
    max: 
      cpu: 1
      memory: 1Gi
  - type: Container 
    defaultRequest:
      cpu: 100m
      memory: 10Mi
    default:
      cpu: 200m
      memory: 100Mi
    min:
      cpu: 50m
      memory: 5Mi
    max:
      cpu: 1
      memory: 1Gi
    maxLimitRequestRatio:
      cpu: 4
      memory: 10
  - type: PersistentVolumeClaim 
    min:
      storage: 1Gi
    max:
      storage: 10Gi

QoS等级¶

Guaranteed:

优先级最高
设备request和limit并设置相等 --> QoS=Guaranteed

BestEffort:

优先级最低
未设置request和limit --> QoS=BestEffort

Burstable:

其他情况   --> QoS=Burstable

内存不足时哪个进程会被杀死:

BestEffort -> Burstable -> Guaranteed

https://img.zhaoweiguo.com/knowledge/images/k8s/LimitRangeQoS.png