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 firewalldsystemctl 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 etcdsystemctl start dockersystemctl start kube-apiserversystemctl start kube-controller-managersystemctl start kube-schedulersystemctl start kubeletsystemctl 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: v1kind: ReplicationControllermetadata: 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）

   $ 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: v1kind: Servicemetadata:name: mysqlspec:ports:- port: 3306selector: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 svcNAME CLUSTER-IP EXTERNAL-IP PORT(S) AGEkubernetes 10.254.0.1 
         
           443/TCP 8dmysql 10.254.55.41 
          
            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 
         
           443/TCP 8d	mysql 10.254.55.41 
          
            3306/TCP 42m	myweb 10.254.237.187 
           
             8080:30001/TCP 21s
           
          
         

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