Kubernetes(k8s)的调度器 - 调度亲和性详细介绍

节点亲和性

pod.spec.nodeAffinity

  • preferredDuringSchedulingIgnoredDuringExecution:软策略
  • requiredDuringSchedulingIgnoredDuringExecution:硬策略

requiredDuringSchedulingIgnoredDuringExecution

apiVersion: v1
kind: Pod
metadata:
  name: affinity
  labels:
    app: node-affinity-pod
spec:
  containers:
  - name: with-node-affinity
    image: wangyanglinux/myapp:v1
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/hostname
            operator: NotIn
            values:
            - node02

preferredDuringSchedulingIgnoredDuringExecution

apiVersion: v1
kind: Pod
metadata:
  name: affinity
  labels:
    app: node-affinity-pod
spec:
  containers:
  - name: with-node-affinity
    image: wangyanglinux/myapp:v1
  affinity:
    nodeAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - node3

先硬后软

apiVersion: v1
kind: Pod
metadata:
  name: affinity
  labels:
    app: node-affinity-pod
spec:
  containers:
  - name: with-node-affinity
    image: hub.atguigu.com/library/myapp:v1
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/hostname
            operator: NotIn
            values:
            - k8s-node02
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: source
            operator: In
            values:
            - qikqiak

键值运算关系

  • In:label 的值在某个列表中
  • NotIn:label 的值不在某个列表中
  • Gt:label 的值大于某个值
  • Lt:label 的值小于某个值
  • Exists:某个 label 存在
  • DoesNotExist:某个 label 不存在
     

 Pod  亲和性

pod.spec.affinity.podAffinity/podAntiAffinity

  • preferredDuringSchedulingIgnoredDuringExecution:软策略
  • requiredDuringSchedulingIgnoredDuringExecution:硬策略
apiVersion: v1
kind: Pod
metadata:
  name: pod-3
  labels:
    app: pod-3
spec:
  containers:
  - name: pod-3
    image: wangyanglinux/myapp:v1
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values:
            - pod-1
        topologyKey: kubernetes.io/hostname
    podAntiAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        podAffinityTerm:
          labelSelector:
            matchExpressions:
            - key: app
              operator: In
              values:
              - pod-2
          topologyKey: kubernetes.io/hostname

亲和性/反亲和性调度策略比较如下:
 

调度策略匹配 标签 匹配 标签 操作符 拓扑域 支持 调度目标
nodeAffinity  主机 In, NotIn, Exists, DoesNotExist, Gt, Lt 指向主机
podAffinity  POD In, NotIn, Exists, DoesNotExist POD与指定POD同一拓 扑域
podAnitAffinity  POD In, NotIn, Exists, DoesNotExist POD与指定POD不在同 一拓扑域

 

posted @ 2020-02-11 16:02  南宫乘风  阅读(1698)  评论(0编辑  收藏  举报