节点亲和性

pod.spec.nodeAffinity

• preferredDuringSchedulingIgnoredDuringExecution：软策略

• requiredDuringSchedulingIgnoredDuringExecution：硬策略

requiredDuringSchedulingIgnoredDuringExecution

apiVersion: v1kind: Podmetadata:  name: affinity  labels:    app: node-affinity-podspec:  containers:  - name: with-node-affinity    image: wangyanglinux/myapp:v1  affinity:    nodeAffinity:      requiredDuringSchedulingIgnoredDuringExecution:        nodeSelectorTerms:        - matchExpressions:          - key: disktype            operator: NotIn            values:            - hdd

preferredDuringSchedulingIgnoredDuringExecution

apiVersion: v1kind: Podmetadata:  name: affinity  labels:    app: node-affinity-podspec:  containers:  - name: with-node-affinity    image: wangyanglinux/myapp:v1  affinity:    nodeAffinity:      preferredDuringSchedulingIgnoredDuringExecution:      - weight: 1        preference:          matchExpressions:          - key: kubernetes.io/hostname            operator: In            values:            - k8s-node03

合体

apiVersion: v1kind: Podmetadata:  name: affinity  labels:    app: node-affinity-podspec:  containers:  - name: with-node-affinity    image: wangyanglinux/myapp:v1  affinity:    nodeAffinity:      requiredDuringSchedulingIgnoredDuringExecution:        nodeSelectorTerms:        - matchExpressions:          - key: disktype            operator: NotIn            values:            - hdd      preferredDuringSchedulingIgnoredDuringExecution:      - weight: 1        preference:          matchExpressions:          - key: kubernetes.io/hostname            operator: In            values:            - k8s-node01

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

如果nodeSelectorTerms下面有多个选项的话，满足任何一个条件就可以了；如果matchExpressions有多个选项的话，则必须同时满足这些条件才能正常调度 POD

Pod 亲和性

pod.spec.affinity.podAffinity/podAntiAffinity

• preferredDuringSchedulingIgnoredDuringExecution：软策略
• requiredDuringSchedulingIgnoredDuringExecution：硬策略

apiVersion: v1kind: Podmetadata:  name: pod-3  labels:    app: pod-3spec:  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：