污点和容忍度

node节点的亲和性

node节点亲和性调度：nodeAffinity

kubectl explain pods.spec.affinity.nodeAffinity

preferredDuringSchedulingIgnoredDuringExecution：软亲和性，尽可能的满足

requiredDuringSchedulingIgnoredDuringExecution：硬亲和性，必须满足

1、使用硬亲和性测试

vim pod-nodeaffinity-demo.yaml

apiVersion: v1
kind: Pod
metadata:
        name: pod-node-affinity-demo
        namespace: default
        labels:
            app: myapp
            tier: frontend
spec:
    containers:
    - name: myapp
      image: ikubernetes/myapp:v1
    affinity:
         nodeAffinity:
            requiredDuringSchedulingIgnoredDuringExecution:
                   nodeSelectorTerms:
                   - matchExpressions:
                     - key: zone
                       operator: In
                       values:
                       - foo
                       - bar

我们检查当前节点中任意一个节点拥有zone标签的值是foo或者bar，就可以把pod调度到这个node节点的foo或者bar标签上的节点上

没有定义zone=foo或者zone=bar标签，所以无法找到，会报错

kubectl label node node01 zone=foo

kubectl apply -f pod-nodeaffinity-demo.yaml 

2、使用软亲和性测试

vim pod-nodeaffinity-demo-2.yaml

apiVersion: v1
kind: Pod
metadata:
        name: pod-node-affinity-demo-2
        namespace: default
        labels:
            app: myapp
            tier: frontend
spec:
    containers:
    - name: myapp
      image: ikubernetes/myapp:v1
    affinity:
        nodeAffinity:
            preferredDuringSchedulingIgnoredDuringExecution:
            - preference:
               matchExpressions:
               - key: zone1
                 operator: In
                 values:
                 - foo1
                 - bar1
              weight: 60

创建

 kubectl apply -f pod-nodeaffinity-demo-2.yaml 

虽然没有zone1=foo1标签，但是一样会调度，这就是软亲和性

node节点亲和性针对的是pod和node的关系。pod调度到node节点的时候匹配的条件。

来张图片镇楼

Mr丶点心永久会员

打赏 收藏 海报 链接