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k8s-Pod

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k8s-PODs with YAML

YAML in Kubernetes

  • k8s definition file always contains 4 top level fields.(apiVersion,kind,metadata,spec)

pod-definition.yml

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apiVersion:
kind:
metadata:

spec:

  • apiVersion:

    Kind Version
    POD v1
    Service v1
    ReplicaSet apps/v1
    Deployment apps/v1

    deploy POD时使用v1

  • kind：

    • 类型：Pod，Service，ReplicaSet，Deployment

  • metadata：

    The metadata is data about the object like its name，labels etc.

    name: 用来指定pod的名字

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    metadata:
      name: myapp-pod
      labels:
        app: myapp
        type: front-end

    metadata里面是字典类型。

  • spec:

    spec里面contianers下面是一个list,list里面有不同字段（是字典）

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    spec:
      containers:
        - name: nginx-container
          image: nginx

启动pods

  • kubectl apply -f pod-definition.yml

  • kubectl get pods

  • kubectl describe pod myapp-pod

Example

  • pod.yaml

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    apiVersion: v1
    kind: Pod
    metadata:
      name: myapp-pod
      labels:
        app: nginx
        # tier:层
        tier: frontend 
    spec:
      containers:
        - name: nginx
          image: nginx
        - name: busybox
          image: busybox

  • pod-definition.yml 

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    apiVersion: v1
    kind: Pod
    metadata:
      name: postgres
      labels:
        tier: db-tier
    spec:
      containers:
        - name: postgres
          image: postgres
          env:
            - name: POSTGRES_PASSWORD
              value: mysecretpassword

启动pod

kubectl apply -f pod.yaml

使用vscode编辑yaml

  • 在settting.json中加入

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    {
    	"yaml.schemas": {
            "kubernetes": "*.yaml"
        }
    }

删除pod

kubectl delete pod myapp-pod

编辑pod

kubectl edit pod myapp-pod