K8s权威指南学习

第一章 k8s入门（简单的Java web项目） 

环境： VMware Workstation在本机虚拟一个64位的Centos7虚拟机

环境准备

1. 关闭防火墙

   systemctl disable firewalld systemctl stop firewalld 

2. 安装etcd和Kubernetes软件（会自动安装Docker软件）

   yum install -y etcd kubernetes 

3. 按顺序启动所有服务

   systemctl start etcd systemctl start docker systemctl start kube-apiserver systemctl start kube-controller-manager systemctl start kube-scheduler systemctl start kubelet systemctl start kube-proxy

启动MySQL服务

1. MySQL镜像

   docker pull daocloud.io/library/mysql:latest 

2. 构建Mysql RC定义文件(可以使用vim创建)，命名mysql-rc.yaml 内容如下：

   apiVersion: v1 kind: ReplicationController metadata: name: mysql spec: replicas: 1 selector: app: mysql template: metadata: labels: app: mysql spec: containers: - name: mysql image: mysql ports: - containerPort: 3306 env: - name: MYSQL_ROOT_PASSWORD value: "123456" 

3. 发布到kubernetes集群中，在master节点执行命令（注：此时可能出现问题，如：问题1：no resource found，问题2：status的状态是ContainerCreating而不是running，如果出现此问题请看关于创建rc和pod出现的问问题）

   $ kubectl create -f mysql-rc.yaml replicationcontroller "mysql" created 

   查看创建的rc

   $ kubectl get rc NAME DESIRED CURRENT READY AGE mysql 1 1 1 14s 

   查看pod创建情况

   $ kubectl get pods NAME READY STATUS RESTARTS AGE mysql-srd1m 1/1 Running 0 41s 

4. 创建一个与之关联的k8s Service-Mysql的定义文件（文件名为mysql-svc.yaml）,内容如下：

   apiVersion: v1 kind: Service metadata: name: mysql spec: ports: - port: 3306 selector: app: mysql 

   运行kubectl命令，创建service

   kubectl create -f mysql-svc.yaml 

   查看刚刚创建的service

   $ kubectl get svc NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes 10.254.0.1 <none> 443/TCP 8d mysql 10.254.55.41 <none> 3306/TCP 13s

启动Tomcat服务

1. 拉取Tomcat镜像

    docker pull kubeguide/tomcat-app:v2 

2. 构建Tomcat RC定义文件，命名myweb-rc.yaml 内容如下：

    apiVersion: v1 kind: ReplicationController metadata: name: myweb spec: replicas: 2 selector: app: myweb template: metadata: labels: app: myweb spec: containers: - name: myweb image: kubeguide/tomcat-app:v1 ports: - containerPort: 8080 

   完成rc创建和验证

    $ kubectl create -f myweb-rc.yaml replicationcontroller "myweb" created $ kubectl get rc NAME DESIRED CURRENT READY AGE mysql 1 1 1 23h myweb 2 2 2 12s $ kubectl get pods NAME READY STATUS RESTARTS AGE mysql-srd1m 1/1 Running 1 23h myweb-fqlvz 1/1 Running 0 40s myweb-ggrlg 1/1 Running 0 40s 

3. 创建对应的Service，文件名（myweb-svc.yaml）,内容如下

    apiVersion: v1 kind: Service metadata: name: myweb spec: type: NodePort ports: - port: 8080 nodePort: 30001 selector: app: myweb 

   创建并验证

    $ kubectl create -f myweb-svc.yaml service "myweb" created $ kubectl get services NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes 10.254.0.1 <none> 443/TCP 8d mysql 10.254.55.41 <none> 3306/TCP 42m myweb 10.254.237.187 <nodes> 8080:30001/TCP 21s

本文转移开源中国-K8s权威指南学习