Kubernetes 调度器

1、Kubernetes 调度器 - 调度说明

　　https://blog.csdn.net/wtl1992/article/details/104982548

2、Kubernetes 调度器 - 调度亲和性

 　　https://blog.csdn.net/wtl1992/article/details/104983234

3、Kubernetes 调度器 - 污点

　　https://blog.csdn.net/wtl1992/article/details/105041339

4、Kubernetes 调度器 - 固定节点

　　https://blog.csdn.net/wtl1992/article/details/105043138

 

案例：

　　节点亲和性
　　　　pod.spec.nodeAffinity
　　　　preferredDuringSchedulingIgnoredDuringExecution：软策略
　　　　requiredDuringSchedulingIgnoredDuringExecution：硬策略

指定到 kubernetes.io/hostname=xgcloud-ops-k8s-cluster-2.novalocal  有这个标签的机器

 requiredDuringSchedulingIgnoredDuringExecution：硬策略

[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod2.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
    version: v1
spec:
  containers: 
  -  name: app
     image: nginx
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - xgcloud-ops-k8s-cluster-2.novalocal

 preferredDuringSchedulingIgnoredDuringExecution：软策略

[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod3.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod3
  labels:
    app: myapp-pod3
    version: v1
spec:
  containers: 
  -  name: myapp-pod3
     image: nginx
  affinity:
    nodeAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - xgcloud-ops-k8s-cluster-5.novalocal

kubectl apply -f pod3.yaml

kubectl get pod -o wide

 指定了xgcloud-ops-k8s-cluster-5.novalocal，没有这个node，但是还是成功running，调度到了 xgcloud-ops-k8s-cluster-1.novalocal

preferredDuringSchedulingIgnoredDuringExecution：软策略
requiredDuringSchedulingIgnoredDuringExecution：硬策略

一起进行配置：

[root@xgcloud-ops-k8s-cluster-4 nodeaff]# cat pod4.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod4
  labels:
    app: myapp-pod4
    version: v1
spec:
  containers: 
  -  name: myapp-pod4
     image: nginx
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - xgcloud-ops-k8s-cluster-3.novalocal
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - xgcloud-ops-k8s-cluster-5.novalocal

kubectl apply -f pod4.yaml

kubectl describe pod/myapp-pod4

kubectl get pod -o wide

 pod亲和性

pod.spec.affiffiffinity.podAffiffiffinity/podAntiAffiffiffinity

 

没找到别的容器，暂时不测了，用法差不多

 

 

跑一个pod2

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
    version: v1
spec:
  containers: 
  -  name: app
     image: nginx
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - xgcloud-ops-k8s-cluster-2.novalocal

跑一个pod3跟他pod亲和

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod3
  labels:
    app: myapp-pod3
    version: v1
spec:
  containers: 
  - command:
    - "sleep"
    - "3600"
    name: myapp-pod3
    image: busybox
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values:
            - myapp
        topologyKey: kubernetes.io/hostname 
    podAntiAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        podAffinityTerm:
          labelSelector:
            matchExpressions:      
            - key: app
              operator: In      
              values:       
              - myapp-pod4       
          topologyKey: kubernetes.io/hostname