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k8s 基本概念理解

 3 years ago
source link: http://www.chenshake.com/k8s-basic-conceptual-understanding-of-the-basic-concepts-of/
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neoserver,ios ssh client

 

其实用了k8s很久，但是很多概念的理解，有时候真的需要动手，才能真正理解。

官方文档提供的nginx的deployment模版，我修改一下，采用alpine镜像，副本的数量为1

nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: default
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:alpine
        ports:
        - containerPort: 80

有几个地方需要留意

  • deployment 名字是 nginx-deployment, 后续你可以用 kubectl get svc 看到
  • labels, 标签是：nginx，
  • namespace 如果不指定，就是使用default，我这里专门加入，便于理解。
  • 部署pod的数量是1
  • nginx的alpine镜像，小很多，方便试验。
kubectl apply -f nginx.yaml 
kubectl get pod
kubectl get deployment
kubectl get svc
kubectl expose deployment nginx-deployment --type=NodePort --name=hello
kubectl get svc
kubectl describe svc hello

 Posted by 陈沙克 at 11:41 AM

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