如何设置Pod的优先级实现抢占功能

在 Kubernetes 中如何通过设置 Pod 优先级实现抢占功能。

在 Kubernetes中提供了 PriorityClass 类型的资源对象，通过创建 PriorityClass 可以实现 Pod 的优先级。

1.创建 PriorityClass

$ cat priorityclass-test.yaml 
apiVersion: scheduling.k8s.io/v1
kind: PriorityClass
metadata:
  name: high-priority-nonpreempting
value: 1000000
preemptionPolicy: Never
globalDefault: false
description: "This priority class will not cause other pods to be preempted."

$ kubectl apply -f priorityclass-test.yaml

$ kubectl get priorityclasses|grep high-priority
high-priority-nonpreempting   1000000      false            33s

2.使用PriorityClass 创建 Pod

$ cat priorityclass-pod-test.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: test
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  priorityClassName: high-priority-nonpreempting

$ kubectl apply -f priorityclass-pod-test.yaml 

$ kubectl get pod -n default 
NAME                         READY   STATUS    RESTARTS   AGE
nginx                        1/1     Running   0          17m

[1] https://kubernetes.io/zh/docs/concepts/scheduling-eviction/pod-priority-preemption/ 如果您有其他问题，欢迎您联系火山引擎技术支持服务