[kubernetes集群调度] - ② 调度亲和性

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