kube集群管理学系

集群管理的必要性

容器时代已经到来，如何批量管理容器是一项至关重要的技能

本篇文章在搭建好 minikube 的基础上进行，nginx 的服务暴露

热升级，热扩容 介绍

但多个服务子节点，进行升级以及扩容时，k8s 会平滑的进行服务迁移，只需要在配置文件中修改 对应的配置即可

部署 升级 扩容 nginx 服务

#提交一个 nginx deployment；
kubectl apply  -f  https://k8s.io/examples/application/deployment.yaml
 
#升级 nginx deployment；
kubectl apply -f  https://k8s.io/examples/application/deployment-update.yaml

#扩容 nginx deployment。
kubectl apply -f  https://k8s.io/examples/application/deployment-scale.yaml

查看启动的nginx pods

kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-574b87c764-hn9p5   1/1     Running   0          56m
nginx-deployment-574b87c764-lc9h2   1/1     Running   0          56m

查看nginx deployment

kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   2/2     2            2           55m

暴露nginx service

 kubectl expose deployment/nginx-deployment --type="NodePort" --port 80

查看nginx service

kubectl get service
NAME               TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes         ClusterIP   10.96.0.1    <none>        443/TCP        26h
nginx-deployment   NodePort    10.96.0.88   <none>        80:31174/TCP   26m

删除service

kubectl delete service nginx-deployment

固定service 的 对外端口

apiVersion: v1 # for versions before 1.9.0 use apps/v1beta2

kind: Service
metadata:
  name: nginx-service
spec:
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
    # 固定端口数值，必须是配置文件范围内
    nodePort: 30100
  type: NodePort
  selector:
    app: nginx

执行

 kubectl create -f C:\Users\73444\Desktop\service.yaml