一、docker介绍
Docke
r是一个开源的应用容器引擎,它允许开发者将应用及其依赖打包到一个可移植的容器中。这个容器可以在任何流行的 Linu
x或 Window
s操作系统上运行,并且支持虚拟化。容器是完全基于沙箱机制的,这意味着它们之间不会有任何接口,从而确保了隔离性和安全性。
二、代码工程
pom.xml添加docker打包插件
<?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">
<parent>
<artifactId>springboot-demo</artifactId>
<groupId>com.et</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>docker</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- Docker Maven Plugin -->
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.2.0</version> <!-- 使用最新版本 -->
<configuration>
<imageName>springboot-demo/springboot-with-docker</imageName>
<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
<!-- End of Docker Maven Plugin -->
</plugins>
</build>
</project>
配置Dockerfile
FROM openjdk:8-jdk-alpine
VOLUME /tmp
ADD docker-1.0-SNAPSHOT.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
启动类
package com.et.docker;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
配置文件
server:
port: 8088
controller
package com.et.docker.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.HashMap;
import java.util.Map;
@Controller
public class HelloWorldController {
@RequestMapping("/hello")
@ResponseBody
public Map<String, Object> showHelloWorld(){
Map<String, Object> map = new HashMap<>();
map.put("msg", "HelloWorld");
return map;
}
}
构建镜像
mvn clean package docker:build
查看镜像
docker images
三、测试
运行镜像服务
docker run -p 8088:8088 springboot-demo/springboot-with-docker
访问地址http://127.0.0.1:8088/hello,返回
{"msg":"HelloWorld"}
四、引用