kubernetes视频教程笔记（26）-集群调度-节点亲和性

软件工程小施同学发布时间：2020-12-07 18:41:20 ，浏览量：0

一、节点亲和性 1. pod.spec.nodeAffinity

preferredDuringSchedulingIgnoredDuringExecution：软策略
requiredDuringSchedulingIgnoredDuringExecution：硬策略

2. 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

3. 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:
   preferredDuringSchedulingIgnoredDuringExecution:
   - weight: 1
     preference:
      matchExpressions:
      - key: source
        operator: In
        values:
        - qikqiak

4. 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

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，就必须同时满足这些条件才能正常调度pod

5. 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

二、Pod 亲和性（Pod和Pod之间） 1. 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