Linux——pod实验练习

练习：

1. 创建一个deployment资源
   • 名为test-nginx
   • 使用nginx：1.19.1版本镜像
   • 设置pod 标签为 app=frontend
   • 设置副本数量为3
2. 创建一个service 将上面的服务暴露给客户端访问
3. 基于nginx:1.19.1构建一个新的镜像。镜像名为mynginx:new_files
   • base镜像为nginx:1.19.1
   • 更新本地的index.html 文件到镜像的/usr/share/nginx/html 目录下
   • 本地index.html文件的内容为“update on 10-8”
   • 镜像名为mynginx:new_files
   • 如果使用docker build进行构建，注意将镜像同步到每一个工作节点上
4. 更新test-nginx的镜像为上一步构建的mynginx:new-files
5. 访问pod所运行的nginx服务时，获得响应为update on 10-8
6. 结合日志，观察pod的调度和访问，重点观察滚动更新的过程

7. [root@control ~]# source  .kube/k8s_bash_completion
   [root@control ~]# cp nginx-deployment.yml test-nginx.yml
   [root@control ~]# vim test-nginx.yml
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: test-nginx
   spec:
     selector:
       matchLabels:
         app: frontend
     replicas: 3
     template:
       metadata:
         labels:
           app: frontend
       spec:
         containers:
         - name: test-nginx
           image: nginx:1.19.1
           imagePullPolicy: IfNotPresent
           ports:
           - containerPort: 80
   
   [root@control ~]# kubectl apply -f test-nginx.yml
   deployment.apps/test-nginx created
   [root@control ~]# kubectl get pods
   NAME                         READY   STATUS    RESTARTS   AGE
   test-nginx-779c87479-phtjz   1/1     Running   0          31s
   test-nginx-779c87479-pssrj   1/1     Running   0          31s
   test-nginx-779c87479-xs2dg   1/1     Running   0          31s
   [root@control ~]# kubectl get deployments.apps
   NAME         READY   UP-TO-DATE   AVAILABLE   AGE
   test-nginx   3/3     3            3           57s
   [root@control ~]# kubectl expose deployment test-nginx
   service/test-nginx exposed
   [root@control ~]# kubectl get svc
   NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
   kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP   11d
   test-nginx   ClusterIP   10.106.82.252   <none>        80/TCP    33s
   [root@control ~]# curl 10.106.82.252
   [root@control ~]# kubectl get pods
   NAME                         READY   STATUS    RESTARTS   AGE
   test-nginx-779c87479-phtjz   1/1     Running   0          5m2s
   test-nginx-779c87479-pssrj   1/1     Running   0          5m2s
   test-nginx-779c87479-xs2dg   1/1     Running   0          5m2s
   [root@control ~]# curl 10.106.82.252  // 使用svc 对应的集群IP进行服务访问
   ……省略输出，多尝试几次 观察service对于pod的负载均衡实现
   [root@control ~]# mkdir nginx-build
   [root@control ~]# cd nginx-build/
   [root@control nginx-build]# ls
   [root@control nginx-build]# echo "update on 10-8" >> index.html
   [root@control nginx-build]# vim Dockerfile
   [root@control nginx-build]# systemctl start docker
   # base镜像包括容器启动命令，故Dockerfile未规定，一个镜像必须包括一个容器启动命令
   [root@control nginx-build]# docker image history nginx:1.19.1
   IMAGE          CREATED       CREATED BY                                      SIZE      COMMENT
   08393e824c32   4 years ago   /bin/sh -c #(nop)  CMD ["nginx" "-g" "daemon…   0B
   <missing>      4 years ago   /bin/sh -c #(nop)  STOPSIGNAL SIGTERM           0B
   <missing>      4 years ago   /bin/sh -c #(nop)  EXPOSE 80                    0B
   <missing>      4 years ago   /bin/sh -c #(nop)  ENTRYPOINT [