k8s离线部署nginx

1. 拉取nginx离线包到本地

sudo docker save nginx:latest -o nginx.tar

2. 导入nginx image到k8s命名空间中

sudo ctr -n k8s.io images import nginx.tar

3. 编辑nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
  type: LoadBalancer

注意 imagePullPolicy 是 IfNotPresent，使用本地镜像，k8s镜像的拉取策略为：

Always 总是拉取镜像
IfNotPresent 本地有则使用本地镜像,不拉取
Never 只使用本地镜像，从不拉取，即使本地没有
如果省略imagePullPolicy，  策略为always

4. apply yaml启动deployment

kubectl apply -f nginx.yaml

5. kubectl查看部署已经完成

$ kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   2/2     2            2           5m52s
$ kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-54b6f7ddf9-vcl6k   1/1     Running   0          5m58s
nginx-deployment-54b6f7ddf9-x6j7z   1/1     Running   0          5m58s

6. 暴露nginx服务

$ kubectl expose deployment nginx-deployment --type=NodePort --port=80
service/nginx-deployment exposed

$ kubectl get svc nginx-deployment
NAME               TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
nginx-deployment   NodePort   10.102.52.246   <none>        80:31177/TCP   105s