K8s-yaml的使用及命令

偏执的太偏执、 2022-10-11 06:16 8阅读 0赞

YAML配置文件管理对象
    对象管理：
    # 创建deployment资源
    kubectl create -f nginx-deployment.yaml
    # 查看deployment
    kubectl get deploy
    # 查看ReplicaSet
    kubectl get rs
    # 查看pods所有标签
    kubectl get pods --show-labels
    # 根据标签查看pods
    kubectl get pods -l app=nginx
    # 滚动更新镜像
    kubectl set image deployment/nginx-deployment nginx=nginx:1.11
    或者
    kubectl edit deployment/nginx-deployment
    或者
    kubectl apply -f nginx-deployment.yaml
    # 实时观察发布状态：
    kubectl rollout status deployment/nginx-deployment
    # 查看deployment历史修订版本
    kubectl rollout history deployment/nginx-deployment
    kubectl rollout history deployment/nginx-deployment --revision=3
    # 回滚到以前版本
    kubectl rollout undo deployment/nginx-deployment
    kubectl rollout undo deployment/nginx-deployment --to-revision=3
    # 扩容deployment的Pod副本数量
    kubectl scale deployment nginx-deployment --replicas=10
    # 设置启动扩容/缩容
    kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80

对象管理实例：vim nginx.deployment.yaml

apiVersion: apps/v1beta2
    kind: Deployment
    metadata:
      name: nginx-deployment
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: nginx
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx:1.10
            ports:
            - containerPort: 80

服务发现实例：vim nging.service.yaml

apiVersion: v1
    kind: Service
    metadata:
      labels:
        run: nginx
      name: nginx
      namespace: default
    spec:
      ports:
      - port: 88
        targetPort: 80
      selector:
        app: nginx

清理：

\# kubectl delete -f nginx-deployment.yaml

\# kubectl delete -f nginx-service.yaml

POD作用：

 Pod状态  创建/查询/更新/删除  重启策略  健康检查  数据持久化和共享  hostPort  问题定位

Pod管理-创建/查询/更新/删除
    基本管理：
    # 创建pod资源
    kubectl create -f pod.yaml
    # 查看pods
    kubectl get pods pod-test
    # 查看pod描述
    kubectl describe pod pod-test
    # 替换资源
    kubectl replace -f pod.yaml -force
    # 删除资源
    kubectl delete pod pod-test

支持三种策略：

Always：当容器终止退出后，总是重启容器，默认策略。

OnFailure：当容器异常退出（退出状态码非0）时，才重启容器。

Never：当容器终止退出，从不重启容器。

Pod实例：vim pod.yaml

apiVersion: v1
    kind: Pod
    metadata:
      name: pod-test
      labels:
         os: centos
    spec:
      containers:
      - name: hello
        image: centos:7
        env:
        - name: Test
          value: "123456"
        command: ["bash","-c","while true;do date;sleep 1;done"]
      restartPolicy: OnFailure

Pod管理-健康检查

提供Probe机制，有以下两种类型：
    livenessProbe
    如果检查失败，将杀死容器，然后根据Pod的重启策略来决定是否
    重启。
    readinessProbe
    如果检查失败，Kubernetes会把Pod从服务代理的分发后端剔除。
    Probe支持以下三种检查方法：
    httpGet
    发送HTTP请求，返回200-400范围状态码为成功。
    exec
    执行Shell命令返回状态码是0为成功。
    tcpSocket
    发起TCP Socket建立成功。

实例：vim pod2.yaml

apiVersion: v1
    kind: Pod
    metadata:
      name: nginx-pod
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.10
        ports:
        - containerPort: 80
        livenessProbe:
          httpGet:
            path: /index.html
            port: 80

Pod管理-数据持久化和共享：

vim pod3.yaml

apiVersion: v1
    kind: Pod
    metadata:
      name: pod-test1
      labels:
         test: centos
    spec:
      containers:
      # 第一个容器
      - name: hello-write
        image: centos:7
        command: ["bash","-c","for i in {1..1000};do echo $i >> /data/hello;sleep 1;done"]
      # 第二个容器
      - name: hello-read
        image: centos:7
        command: ["bash","-c","for i in {1..1000};do cat $i >> /data/hello;sleep 1;done"]
        volumeMounts:
          - name: data
            mountPath: /data
      # 数据卷
      volumes:
      - name: data
        hostPath:
          path: /data

Pod端口映射：

vim pod4.yaml

apiVersion: v1
    kind: Pod
    metadata:
      name: nginx-pod
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.10
        ports:
        - name: http
          containerPort: 80
          hostIP: 0.0.0.0
          hostPort: 80
          protocol: TCP
       - name: https
         containerPort: 443
         hostIP: 0.0.0.0
         hostPort: 443
         protocol: TCP