k8s中pod亲和性以及node亲和性配置

1，亲和性分为软亲和性以及硬亲和性

preferredDuringSchedulingIgnoredDuringExecution：软策略 可以不再最好在 requiredDuringSchedulingIgnoredDuringExecution：硬策略 必须在 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

2，node亲和性

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: #亲和性 nodeAffinity: #node的亲和性 requiredDuringSchedulingIgnoredDuringExecution: #硬亲和性 nodeSelectorTerms: #node选择方案 - matchExpressions: # - key: kubernetes.io/hostname #key是node简名节点标签.hostname operator: NotIn #不是,排除 values: - k8s-node02 #主机名不是k8s-node02就可以

---

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: preferredDuringSchedulingIgnoredDuringExecution: #软亲和性 weight: 1 #权重.如果有多个亲和性权重高的优先 preference: #偏好详细信息 matchExpressions: #匹配表达式 key: kubernetes.io/hostname # key是node简名节点标签 operator: In #要在 values: k8s-node03 #主机名是k8s-node03最好

---

3，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 #pod标签 spec: containers:

name: pod-3 image: hub.atguigu.com/library/myapp:v1 affinity: podAffinity: #pod亲和性 requiredDuringSchedulingIgnoredDuringExecution: #硬策略 labelSelector: #便签选择 matchExpressions: key: app #当app有没有一个APP标签是pod-1的就是pod的标签 operator: In #在 values: pod-1 #pod-1的 topologyKey: kubernetes.io/hostname #同一个node节点 #app在哪里就去那个机器创建 podAntiAffinity: preferredDuringSchedulingIgnoredDuringExecution: weight: 1 podAffinityTerm: labelSelector: matchExpressions: - key: app operator: In values: - pod-2 topologyKey: kubernetes.io/hostname

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