环境准备
需要k8s集群和本地仓库，如果你还没有搭建，建议参考我上面两篇文章Kubernetes集群搭建详细指南、为kubernetes创建本地镜像仓库
部署MySQL
首先我们需要创建持久卷和持久卷声明，用来为MySQL挂载存储，不然容器重启数据就丢失了。
创建持久卷和持久卷声明
将以下的yaml声明保存为mysql-pv.yaml，然后执行apply命令。
apiVersion: v1kind: PersistentVolumemetadata:name: mysql-01spec:capacity:storage: 10GiaccessModes:- ReadWriteOncepersistentVolumeReclaimPolicy: RetainstorageClassName: mysqlnfs:path: /nfs/mysqlserver: 192.168.18.131---apiVersion: v1kind: PersistentVolumeClaimmetadata:name: mysql-pv-claimspec:storageClassName: mysqlaccessModes:- ReadWriteOnceresources:requests:storage: 10Gi
kubectl apply -f mysql-pv.yaml
查看pv状态
[root@k8s-master01 springboot-mysql]# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
mysql-01 10Gi RWO Retain Bound default/mysql-pv-claim mysql 28s
部署MySQL 5.6
这里选择了MySQL5.6的版本，你也可以换成其他的。
将以下的yaml声明保存为mysql-deployment.yaml，然后执行apply命令。
我们创建MySQL的同时创建了Service，Service为集群中的容器通信提供了服务发现功能。
apiVersion: apps/v1
apiVersion: v1
kind: Service
metadata:
name: mysql-stand-alone
labels:
app: mysql-stand-alone
spec:
type: NodePort
ports:
- name: mysql-stand-alone
port: 3306
targetPort: 3306
nodePort: 30008
selector:
app: mysql-stand-alone
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql-stand-alone
spec:
selector:
matchLabels:
app: mysql-stand-alone
strategy:
type: Recreate
template:
metadata:
labels:
app: mysql-stand-alone
spec:
containers:
- image: mysql:5.6
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
value: Sgy@97
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
部署
kubectl apply -f mysql-deployment.yaml
查看部署结果：
[root@k8s-master01 springboot-mysql]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-stand-alone-775f8c4fb5-4dldq 1/1 Running 0 60s 192.168.85.226 k8s-node01 <none> <none>
查看svc: mysql-stand-alone
[root@k8s-master01 springboot-mysql]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.20.0.1 <none> 443/TCP 13h
mysql-read NodePort 10.20.60.83 <none> 3306:30036/TCP 12h
mysql-stand-alone NodePort 10.20.1.21 <none> 3306:30008/TCP 23s
mysql-writeandread NodePort 10.20.119.83 <none> 3306:30006/TCP 12h
使用navicat进行远程连接
部署spring-boot项目
在项目根目录创建Dockerfile
# 该镜像需要依赖的基础镜像
FROM openjdk:8-jre-alpine
# 声明服务运行在8088端口
EXPOSE 11000
# 指定维护者的名字
MAINTAINER shenguangyang
# 环境变量，应用名字，注意修改ENTRYPOINT中的名字
ENV APP_NAME=demo
# 将构建出的主包赋值到指定镜像目录中
RUN mkdir -p /home/admin/$APP_NAME/logs /home/admin/$APP_NAME/bin /home/admin/$APP_NAME/target
COPY $APP_NAME.jar /home/admin/$APP_NAME/target/$APP_NAME.jar
ENTRYPOINT ["java" , "-jar" , "/home/admin/demo/target/demo.jar"]
修改配置文件
如下，其中url的第二个mysql-stand-alone即为我们之前创建MySQL的service名称。MySQL的username和password则通过环境变量的形式读取，实际生产环境更推荐用Secret来加密存储MySQL的用户名和密码。
spring:
jackson:
time-zone: GMT+8
date-format: yyyy-MM-dd HH:mm:ss
servlet:
multipart:
enabled: true
max-file-size: 5120MB
max-request-size: 5120MB
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://mysql-stand-alone:3306/test?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=convertToNull&autoReconnect=true
username: ${MYSQL_USERNAME}
password: ${MYSQL_PASSWORD}
构建镜像并推送到私有仓库
#!/bin/bash
APP_GROUP="app"
APP_NAME="demo"
APP_VERSION="v2.0"
HARBOR_URL="192.168.18.131:5000/spring-boot-k8s-app"
APP=$HARBOR_URL"/"$APP_GROUP"/"$APP_NAME":"$APP_VERSION
### docker rmi这步一定要有，如果不删除旧镜像，当新镜像打包的时候会产生none镜像； ###
echo "删除旧镜像"
docker rmi $APP
### 镜像打包 ###
echo "镜像打包"
docker build -f Dockerfile -t $APP .
echo "登录harbor"
docker login 192.168.18.131:5000 -u admin -p Harbor12345
### 推送镜像
echo "推送镜像"
docker push $APP
### 将镜像提交成tar ###
#docker save -o $APP_NAME ".tar" $APP
将jar包以及Dockerfile以及本脚本放在同一个文件夹下，然后执行本脚本进行推送到私有仓库
创建资源定义文件yaml
在项目根目录下创建deploy文件夹，按照如下创建spring-boot-deployment.yaml文件，并放到deploy文件夹下。根据你的实际集群环境，你需要替换192.168.18.128:5000为自己的镜像仓库。
kind: Service
apiVersion: v1
metadata:
name: spring-boot-k8s-app-service
spec:
type: NodePort
selector:
app: spring-boot-k8s-app
ports:
- protocol: TCP
targetPort: 11000
port: 11000
nodePort: 32082
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: spring-boot-k8s-app-deployment
spec:
replicas: 3
selector:
matchLabels:
app: spring-boot-k8s-app
template:
metadata:
labels:
app: spring-boot-k8s-app
spec:
containers:
- name: spring-boot-k8s-app-controller
imagePullPolicy: Always
image: 192.168.18.131:5000/spring-boot-k8s-app/app/demo:v2.0
ports:
- containerPort: 11000
env:
- name: MYSQL_PORT
value: '3306'
- name: MYSQL_USERNAME
value: root
- name: MYSQL_PASSWORD
value: Sgy@97
imagePullSecrets:
- name: myregistrysecret
开始部署
[root@k8s-master01 springboot-mysql]# kubectl apply -f spring-boot-k8s-app-deployment.yaml
service/spring-boot-k8s-app-service created
deployment.apps/spring-boot-k8s-app-deployment created
查看部署状态：发现有1个app调度到node2节点：
[root@k8s-master01 springboot-mysql]# kubectl get pod -l app=spring-boot-k8s-app -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
spring-boot-k8s-app-deployment-67fcbd4746-kcvt5 1/1 Running 0 14m 192.168.85.239 k8s-node01 <none> <none>
spring-boot-k8s-app-deployment-67fcbd4746-wzdpn 1/1 Running 0 14m 192.168.85.249 k8s-node01 <none> <none>
spring-boot-k8s-app-deployment-67fcbd4746-xh8n4 1/1 Running 0 14m 192.168.58.225 k8s-node02 <none> <none>
外部访问
由于当前springboot项目对应的Service为NodePort类型，那么它可以从集群外部通过NodeIp和NodePort进行访问。直接通过宿主机浏览器访问http://192.168.18.132:32082/地址即可看到效果。
参考文献
Harbor企业级私有Docker镜像仓库部署：https://www.yuque.com/yanggev587/qwpqbe/qluzbn
K8S之存储Secret详解：https://www.yuque.com/yanggev587/qwpqbe/wyol7k
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