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  • [kubernetes集群调度]

    节点亲和性

    pod.spec.nodeAffinity：

    • preferredDuringSchedulingIgnoredDuringExecution：软策略
    • requiredDuringSchedulingIgnoredDuringExecution：硬策略

    requiredDuringSchedulingIgnoredDuringExecution：

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    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：

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    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: <br>   preferredDuringSchedulingIgnoredDuringExecution:
       - weight: 1
        preference:
         matchExpressions:
         - key: source
         operator: In
         values:
         - qikqiak

    合体

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    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
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    apiVersion: v1
    kind: Pod
    metadata:
     name: pod-3
     labels:
      app: pod-3
    spec:
     containers:
     - name: pod-3
      image: hub.atguigu.com/library/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 
    		 操作符 拓扑域支持 调度目标
    nodeAffinity 主机 
    In, NotIn, Exists,
    DoesNotExist, Gt, Lt 
    		 否 指定主机 
    podAffinity POD
    In, NotIn, Exists,
    DoesNotExist 
    		 是
    POD与指定POD同一拓
    扑域 
    podAnitAffinity POD
    In, NotIn, Exists,
    DoesNotExist 
    		 是
    POD与指定POD不在同
    一拓扑域
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  • 原文地址：https://www.cnblogs.com/uvwill/p/12940478.html
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