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

访问31177端口即可访问nginx页面，至此部署完成