Error: #pod 启动过程中发⽣错误
NodeLost: #Pod 所在节点失联
Unkown: #Pod 所在节点失联或其它未知异常
Waiting: #Pod 等待启动
Pending: #Pod 等待被调度
Terminating: #Pod 正在被销毁
CrashLoopBackOff：#pod，但是kubelet正在将它重启
InvalidImageName：#node节点⽆法解析镜像名称导致的镜像⽆法下载
ImageInspectError：#⽆法校验镜像，镜像不完整导致
ErrImageNeverPull：#策略禁⽌拉取镜像，镜像中⼼权限是私有等
ImagePullBackOff：#镜像拉取失败，但是正在重新拉取
RegistryUnavailable：#镜像服务器不可⽤，⽹络原因或harbor宕机
ErrImagePull：#镜像拉取出错，超时或下载被强制终⽌
CreateContainerConfigError：#不能创建kubelet使⽤的容器配置
CreateContainerError：#创建容器失败
PreStartContainer： #执⾏preStart hook报错，Pod hook(钩⼦)是由 Kubernetes 管理的 kubelet 发起的，当容器中的进程启动前或者容器中的进程终⽌之前运⾏，⽐如容器创建完成后⾥⾯的服务启动之前可以检查⼀下依赖的其它服务是否启动，或者容器退出之前可以把容器中的服务先通过命令停⽌。
PostStartHookError：#执⾏ postStart hook 报错
RunContainerError：#pod运⾏失败，容器中没有初始化PID为1的守护进程等
ContainersNotInitialized：#pod没有初始化完毕
ContainersNotReady：#pod没有准备完毕
ContainerCreating：#pod正在创建中
PodInitializing：#pod正在初始化中
DockerDaemonNotReady：#node节点decker服务没有启动
NetworkPluginNotReady：#⽹络插件还没有完全启动

# cat nginx.yaml
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 1
  selector:
	matchLabels: #rs or deployment
	  app: ng-deploy-80
	#matchExpressions:
	# - {key: app, operator: In, values: [ng-deploy-80,ng-rs-81]}
  template:
	metadata:
	  labels:
		app: ng-deploy-80
	spec:
	  containers:
	  - name: ng-deploy-80
		image: nginx:1.17.5
		ports:
		- containerPort: 80
		#readinessProbe:
		livenessProbe:
		  httpGet:
			#path: /monitor/monitor.html
			path: /index.html
			port: 80
		initialDelaySeconds: 5
		periodSeconds: 3
		timeoutSeconds: 5
		successThreshold: 1
		failureThreshold: 3
---
apiVersion: v1
kind: Service
metadata:
  name: ng-deploy-80
spec:
  ports:
  - name: http
	port: 81
	targetPort: 80
	nodePort: 40012
	protocol: TCP
  type: NodePort
  selector:
	app: ng-deploy-80

# cat nginx.yaml
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 1
  selector:
  matchLabels: #rs or deployment
	app: ng-deploy-80
	#matchExpressions:
	# - {key: app, operator: In, values: [ng-deploy-80,ng-rs-81]}
  template:
	metadata:
	  labels:
	    app: ng-deploy-80
	spec:
	  containers:
	  - name: ng-deploy-80
		image: nginx:1.17.5
		ports:
		- containerPort: 80
		livenessProbe:
		#readinessProbe:
		  tcpSocket:
			port: 80
     	    #port: 8080
			initialDelaySeconds: 5
			periodSeconds: 3
			timeoutSeconds: 5
			successThreshold: 1
			failureThreshold: 3
---
apiVersion: v1
kind: Service
metadata:
  name: ng-deploy-80
spec:
  ports:
  - name: http
	port: 81
	targetPort: 80
	nodePort: 40012
	protocol: TCP
  type: NodePort
  selector:
	app: ng-deploy-80

# docker pull redis

# cat redis.yaml
# apiVersion: extensions/v1beta1
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
spec:
  replicas: 1
  selector:
    matchLabels: #rs or deployment
      app: redis-deploy-6379
    # matchExpressions:
    # - {key: app, operator: In, values: [redis-deploy-6379,ns-rs-81]}
  template:
    metadata:
      labels:
        app: redis-deploy-6379
    spec:
      containers:
      - name: redis-deploy-6379
        image: redis
        ports:
        - containerPort: 6379
        livenessProbe:
        # readinessProbe:
          exec:
            command:
            # - /apps/redis/bin/redis-cli
            - /usr/local/bin/redis-cli
            - /quit
          initialDelaySeconds: 5
          periodSeconds: 3
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 3
---
apiVersion: v1
kind: Service
metadata:
  name: redis-deploy-6379
spec:
  ports:
  - name: http
    port: 6379
    targetPort: 6379
    nodePort: 40016
    protocol: TCP
  type: NodePort
  selector:
    app: redis-deploy-6379

imagePullPolicy: IfNotPresent # node 节点没有此镜像就去指定的镜像仓库拉取，node 有就是用 node 本地镜像
imagePullPolicy: Always # 每次重建 Pod 都会重新拉取镜像
imagePullPolicy: Never # 从不到镜像中心拉取镜像，只使用本地镜像