调度器、预选策略及优选函数

调度过程分为以下3个阶段

• 预选--->优选---->选定

• predicate--->priority--->select

污点标识，容忍污点，可配置是否容忍污点进行调度（Taints,Tolerations ）

优选函数计算公式

（CPU(（容量  -  POD请求拿走的容量)）10/总容量）+内存（（容量  -  POD请求拿走的容量)）10/总容量））

• 节点选择器：nodeSelector,nodeName

• 节点亲和调度：nodeAffinity

节点选择器使用案例

apiVersion: v1                                                
kind: Pod
metadata:
  name: pod-demo
  namespace: default
  lables:
    app: frontend
spec:
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    imagePullPolicy: IfNotPresent
  nodeSelector:
    disktype: ssd

节点亲和调度案例

apiVersion: v1                                                
kind: Pod
metadata:
  name: pod-demo
  namespace: default
  lables:
    app: frontend
spec:
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    imagePullPolicy: IfNotPresent
  affinity:
    nodeAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
        nodeSelecorTerms:
        - matchExpressions:
          - key: zone
            operator: in
            values:
            - foo
            - bar
      weght: 60

ss