创建 pod

cd ~

vi pod-demo.yaml

# 内容如下

apiVersion: v1

kind: Pod

metadata:

  name: pod-demo

  namespace: default

  labels:

    app: myapp

    tier: frontend

spec:

  containers:

  - name: myapp

    image: ikubernetes/myapp:v1

  - name: busybox

    image: busybox:latest

    command:

    - "/bin/sh"

    - "-c"

    - "sleep 3600"

# 使用 kubectl create 创建 pod

kubectl create -f pod-demo.yaml

# 这个 pod 里面有两个容器，一个是 myapp，一个是 busybox

# 查看日志

kubectl logs pod-demo myapp

# 进入 pod 中的容器内部

kubectl exec -it pod-demo -c myapp -- /bin/sh

创建 deployment

vi deploy-demo.yaml

# 内容如下

apiVersion: apps/v1

kind: Deployment

metadata:

  name: myapp-deploy

  namespace: default

spec:

  replicas: 2

  selector:

    matchLabels:

      app: myapp

      release: canary

  template:

    metadata:

      labels:

        app: myapp

        release: canary

    spec:

      containers:

      - name: myapp

        image: ikubernetes/myapp:v1

        ports:

        - name: http

          containerPort: 80

# 使用 kubectl apply 创建 deployment

kubectl apply -f deploy-demo.yaml

# 通过 kubectl describe 查看 deployment 信息

kubectl describe deploy myapp-deploy

创建 DeamonSet

DeamonSet 用于每个 Node 最多只运行一个 Pod 副本的场景。正如其名称所揭示的，DaemonSet 通常用于运行 daemon。如果一个 yaml 文件中需要定义两种资源需要使用 --- 进行分割。

vi ds-demo.yaml

# 内容如下

apiVersion: apps/v1

kind: Deployment

metadata:

  name: redis

  namespace: default

spec:

  replicas: 1

  selector:

    matchLabels:

      app: redis

      role: logstor

  template:

    metadata:

      labels:

        app: redis

        role: logstor

    spec:

      containers:

      - name: redis

        image: redis:4.0-alpine

        ports:

        - name: redis

          containerPort: 6379

---

apiVersion: apps/v1

kind: DaemonSet

metadata:

  name: myapp-ds

  namespace: default

spec:

  selector:

    matchLabels:

      app: filebeat

      release: stable

  template:

    metadata:

      labels:

        app: filebeat

        release: stable

    spec:

      containers:

      - name: filebeat

        image: ikubernetes/filebeat:5.6.5-alpine

        env:

        - name: REDIS_HOST

          value: redis.default.svc.cluster.local

        - name: REDIS_LOG_LEVEL

          value: info

kubectl apply -f ds-demo.yaml

kubectl expose deployment redis --port=6379

创建 service

vi myapp-svc.yaml

# 内容如下：

apiVersion: v1

kind: Service

metadata:

  name: myapp

  namespace: default

spec:

  selector:

    app: myapp

    release: canary

  clusterIP: 10.99.99.99

  type: NodePort

  ports:

    - port: 80

      targetPort: 80

      nodePort: 30080

kubectl apply -f myapp-svc.yaml 

# 说明

port       ：service 暴露在 cluster ip上的端口

targetPort ：targetPort 是 pod 上的端口

nodePort   :  暴露在集群物理节点上 node 的端口

可以使用其他机器访问 kubernets 上的 30080 端口来访问页面

eg:

192.168.31.205:30080

192.168.31.206:30080

192.168.31.207:30080