Pod存活性探测：用于判断容器是否处理"运行"状态，如果检测未通过，kubelet将会终止容器，根据启动策略(restartPolicy)决定是否重启，如果未定义容器默认为"Success"。存活性探测支持的方法有三种:ExecAction，TCPSocketAction，HTTPGetAction。
使用exec探测文件存在
[root@k8s01 yaml]# kubectl explain pods.spec.containers.livenessProbe
[root@k8s01 yaml]# vim execaction.yaml
apiVersion: v1kind: Podmetadata: labels: test: exec-execaction name: execactionspec: containers: - name: execaction image: busybox:latest args: ["/bin/sh","-c","touch /tmp/test.txt"] --容器启动后创建test.txt文件 livenessProbe: exec: command: ["test","-e","/tmp/test.txt"] --检查test.txt文件，如果存在Pod正常启动，如果不存在Pod创建不成功[root@k8s01 yaml]# kubectl apply -f execaction.yaml
pod/execaction created
[root@k8s01 yaml]#
使用tcp协议探测端口
[root@k8s01 yaml]# vim tcpaction.yaml
apiVersion: v1kind: Podmetadata: labels: test: tcp-execaction name: tcpactionspec: containers: - name: tcpaction image: nginx:latest ports: - name: http containerPort: 80 --暴露80端口 livenessProbe: tcpSocket: --使用tcp探测 port: http --这里可以写协议或者端口，http默认为80端口[root@k8s01 yaml]# kubectl apply -f tcpaction.yaml
pod/tcpaction created
[root@k8s01 yaml]#
使用http协议探测服务
[root@k8s01 yaml]# vim httpaction.yaml
apiVersion: v1kind: Podmetadata: labels: test: http-execaction name: httpactionspec: containers: - name: httpaction image: nginx:latest ports: - name: http containerPort: 80 lifecycle: postStart: --容器启动之前启动以下命令 exec: command: ["/bin/sh","-c","echo 123 > /usr/share/nginx/html/test.html"] livenessProbe: httpGet: path: /test.html --探测nginx是否正常访问test.html页面 port: http[root@k8s01 yaml]# kubectl apply -f httpaction.yaml
pod/httpaction created
[root@k8s01 yaml]#
