kubernetes - 对象的定义(2)

Pod的定义

apiVersion: v1
kind: Pod  # 类型定义为Pod
metadata:
  name: nginx  # 定义Pod的name
  labels:
    app: nginx  # 用来给选择器筛选一组具有相同的label的Pod
spec:
  containers:
  - name: nginx
    image: nginx  # Pod运行的镜像
    ports:
    - containerPort: 80 # Docker容器暴露的端口

Service的定义

apiVersion: v1
kind: Service # 类型为Service
metadata:
  name: nginx # 定义Service的name
spec:
  ports:
  - port: 8078 # the port that this service should serve on, service暴露在cluster ip上的端口
    name: http
    # the container on each pod to connect to, can be a name
    # (e.g. 'www') or a number (e.g. 80)
    targetPort: 80 # targetPort是pod上的端口
    protocol: TCP
  selector:
    app: nginx # 选择-l app=nginx(标签中有app:nginx)的Pod

Deployment的定义

apiVersion: extensions/v1beta1
kind: Deployment  # 类型为Deployment
metadata:
  name: nginx-deployment  # 定义Deployment的name
spec:
  replicas: 3  # 副本数量
  template:  # 表示使用的部署模板信息(Pod)
    metadata:
      labels:
        app: nginx # 定义Pod的Label(-l app=nginx)
    spec:
      containers:  # 定义Pod的Container信息
      - name: nginx # 定义Pod的name
        image: nginx:1.7.9 # 定义Pod的镜像
        ports:
        - containerPort: 80 # 定义Pod的端口

Namespace的定义

apiVersion: v1
kind: Namespace  # 类型为Namespace
metadata:
  name: gateway # 创建gateway命名空间

ConfigMap的定义

apiVersion: v1
kind: ConfigMap  # 类型为ConfigMap
metadata:
  name: special-config  # 配置的name
  namespace: default # 配置所在命名空间
data:
  special.how: very # special["how"]="very"
  special.type: charm # special["type"]="charm"

PersistentVolume的定义

apiVersion: v1
kind: PersistentVolume  # 类型为ConfigMap
metadata:
  name: pv0003   # PV的name
spec:
  capacity:
    storage: 5Gi # PV的容量
  accessModes:
    - ReadWriteOnce # PV的访问权限
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: /tmp # 使用的nfs目录
    server: 172.17.0.2 # 使用的nfs host

与对象创建相关的命令
kubectl create -f xxxx.yaml 根据文件创建定义的对象(或者多个对象)
kubectl apply -f xxxx.yaml 根据文件更新定义的对象