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[kubernetes集群调度] – ② 调度亲和性

云博小周宇3 Mins Read

节点亲和性

pod.spec.nodeAffinity：

  • preferredDuringSchedulingIgnoredDuringExecution：软策略
  • requiredDuringSchedulingIgnoredDuringExecution：硬策略

requiredDuringSchedulingIgnoredDuringExecution：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 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