[kubernetes集群调度] - ② 调度亲和性

节点亲和性

pod.spec.nodeAffinity：

preferredDuringSchedulingIgnoredDuringExecution：软策略
requiredDuringSchedulingIgnoredDuringExecution：硬策略

requiredDuringSchedulingIgnoredDuringExecution：

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：

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

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

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