Mr. Cappuccino的第45杯咖啡——Kubernetes之部署SpringBoot项目

创建一个SpringBoot项目

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.demo</groupId><artifactId>k8s-demo</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.encoding>UTF-8</project.encoding><maven-plugin.version>3.8.1</maven-plugin.version></properties><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.0.RELEASE</version></parent><dependencies><!-- spring-boot-web --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><build><!-- 修改maven打包的项目名 --><finalName>${project.artifactId}</finalName><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>${maven-plugin.version}</version><configuration><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><encoding>${project.encoding}</encoding></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring-boot.version}</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build></project>

AppDemo.java

package com;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** @author honey* @date 2023-02-25 20:14:47*/
@SpringBootApplication
public class AppDemo {public static void main(String[] args) {SpringApplication.run(AppDemo.class);}
}

DemoController.java

package com.demo;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.net.InetAddress;/*** @author honey* @date 2023-02-25 20:13:27*/
@RestController
public class DemoController {@RequestMapping("/")public String index() {return "ip:" + getIp();}public static String getIp() {try {InetAddress ia = InetAddress.getLocalHost();return ia.getHostAddress();} catch (Exception e) {return "500";}}
}

将SpringBoot项目打成Jar包

mvn clean package

使用Dockerfile制作镜像

Dockerfile文件

FROM java:8
# 复制文件到容器
ADD k8s-demo.jar /k8s-demo.jar
# 配置容器启动后执行的命令
ENTRYPOINT ["java","-jar","-Duser.timezone=GMT+08 -XX:+HeapDumpOnOutOfMemoryError -Xms512m -Xmx512m","/k8s-demo.jar"]

操作两台工作节点，将Dockerfile文件和Jar包上传至服务器

mkdir -p /home/demo
cd /home/demo
docker build -f Dockerfile -t k8s-demo:v1 .
docker images

部署SpringBoot项目

apiVersion: apps/v1
kind: Deployment
metadata:name: pc-demonamespace: bubble-dev
spec:replicas: 3selector:matchLabels:app: demotemplate:metadata:labels:app: demospec:containers: - name: k8s-demoimage: k8s-demo:v1ports:- containerPort: 8080---apiVersion: v1
kind: Service
metadata:name: svc-demonamespace: bubble-dev
spec:selector:app: demotype: NodePort ports:- port: 8080nodePort: 30008 targetPort: 8080

kubectl create ns bubble-dev
vi k8s-demo.yaml
cat k8s-demo.yaml
kubectl create -f k8s-demo.yaml

操作Master节点

kubectl get pods -n bubble-dev
kubectl describe pods -n bubble-dev

使用NodeIP:NodePort从外部访问 http://192.168.102.160:30008/ 或者 http://192.168.102.161:30008/