-
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
-
关闭防火墙
systemctl disable firewalldsystemctl stop firewalld
-
安装etcd和Kubernetes软件（会自动安装Docker软件）
yum install -y etcd kubernetes
-
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
-
MySQL镜像
docker pull daocloud.io/library/mysql:latest
-
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"
-
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
-
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
- 拉取Tomcat镜像
docker pull kubeguide/tomcat-app:v2
- 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
- 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
- 拉取Tomcat镜像
-