来源：b站

• Q:集群资源有哪些分类？
  • 名称空间级别
    • 工作负载型资源(workload): Pod、ReplicaSet、Deployment、StatefulSet、DaemonSet、Job、CronJob
    • 服务发现及负载均衡型资源(ServiceDiscovery LoadBalance)：Service、Ingress
    • 配置与存储型资源：Volume(存储卷)、CSI(容器存储接口，可扩展各种第三方存储卷)
    • 特殊类型的存储卷：ConfigMap(当配置中心来使用的资源类型)、Secret(保存敏感数据)、DownwardAPI(把外部环境中的信息输出给容器)
  • 集群级别：Namespace、Node、Role、ClusterRole、RoleBinding、ClusterRoleBinding
  • 元数据级别：HPA、PodTemplate、LimitRange
• Q:容器报错后如何处理？
  • kubectl describe pod myapp-pod
  • 若有多个容器需要用-c指定，查看日志
  • kubectl log myapp-pod -c test
• Q:initContainer模板是什么？
  • initContainers里面会按照顺序依次往下执行

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
  labels:
    app: myapp
spec:
  containers:
  - name: myapp-container
    image: busybox
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
  - name: init-myservice
  image: busybox
  command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done;']
  - name: init-mydb
  image: busybox
  command: ['sh', '-c', 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;']

• Q:检测探针-就绪检测模板？readinessProbe-httpget

apiVersion: v1
kind: Pod
metadata:
  name: readiness-httpget-pod
  namespace: default
spec:
  containers:
  - name: readiness-httpget-container
  image: wangyanglinux/myapp:v1
  imagePullPolicy: IfNotPresent
  readinessProbe:
    httpGet:
      port: 80
      path: /index1.html
    initialDelaySeconds: 1
    periodSeconds: 3

• Q:检测探针-存活检测模板？livenessProbe-exec

apiVersion: v1
kind: Pod
metadata:
  name: liveness-exec-pod
  namespace: default
spec:
  containers:
  - name: liveness-exec-container
    image: hub.atguigu.com/library/busybox
    imagePullPolicy: IfNotPresent
    command: ["/bin/sh","-c","touch /tmp/live ; sleep 60; rm -rf /tmp/live; sleep 3600"]
    livenessProbe:
      exec:
        command: ["test","-e","/tmp/live"]
      initialDelaySeconds: 1
      periodSeconds: 3

• Q:检测探针-存活检测模板？livenessProbe-httpget

apiVersion: v1
kind: Pod
metadata:
  name: liveness-httpget-pod
  namespace: default
spec:
  containers:
  - name: liveness-httpget-container
  image: hub.atguigu.com/library/myapp:v1
  imagePullPolicy: IfNotPresent
  ports:
  - name: http
    containerPort: 80
  livenessProbe:
    httpGet:
      port: http
      path: /index.html
    initialDelaySeconds: 1
    periodSeconds: 3
    timeoutSeconds: 10

• Q:检测探针-存活检测模板？livenessProbe-tcp

apiVersion: v1
kind: Pod
metadata:
  name: probe-tcp
spec:
  containers:
  - name: nginx
    image: hub.atguigu.com/library/myapp:v1
    livenessProbe:
      initialDelaySeconds: 5
      timeoutSeconds: 1
      tcpSocket:
        port: 80

• Q:启动、退出动作pod模板

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec:
  containers:
  - name: lifecycle-demo-container
    image: nginx
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
      preStop:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the poststop handler > /usr/share/message"]