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