Always: 只要容器一次退出，kubelet 就会自动重启该容器
OnFailure: 当容器终止运行且退出码不为0，由kubelet自动重启容器
Never： 无论容器处于何种状态，kubelet都不会重启该容器

[root@k8smaster4 taints]# kubectl exec -it demo-pod -c tomcat-pod-java -- /bin/bash

[root@k8smaster4 taints]# vi pod-restart.yaml 

apiVersion: v1
kind: Pod
metadata:
  name: demo-pod
  namespace: default
  labels:
    environment: test
    program: tomcat
spec:
  restartPolicy: Always
  containers:
  - name: tomcat-pod-java
    ports:
    - containerPort: 8080
    image: docker.io/xianchao/tomcat-8.5-jre8:v1
    imagePullPolicy: IfNotPresent