Spring Boot Docker 实战

Spring Boot Docker

开发环境

开发工具： Intellij IDEA 2018.2.6

springboot: 2.0.6.RELEASE

jdk： 1.8.0_192

maven: 3.6.0

docker: Docker Engine - Community 18.09.0

搭建项目

由于使用了 Spring Cloud 的Eureka所以加了 eureka 的依赖，基本不需要多加额外的配置

• pom.xml

<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>

    <artifactId>spring-boot-docker</artifactId>
    <groupId>com.andy</groupId>
    <version>1.0.7.RELEASE</version>

    <packaging>jar</packaging>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>io.spring.platform</groupId>
                <artifactId>platform-bom</artifactId>
                <version>Cairo-SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <docker.image.prefix>andy</docker.image.prefix>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

    </dependencies>

    <build>
        <finalName>spring-docker</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.0.3.RELEASE</version>
                <configuration>
                    <!--<mainClass>${start-class}</mainClass>-->
                    <layout>ZIP</layout>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <version>1.0.0</version>
                <configuration>
                    <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
                    <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>
                    <dockerDirectory>src/main/docker</dockerDirectory>
                    <baseImage>java</baseImage>
                    <resources>
                        <resource>
                            <targetPath>/</targetPath>
                            <directory>${project.build.directory}</directory>
                            <include>${project.build.finalName}.jar</include>
                        </resource>
                    </resources>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

• application.yml

server:
  port: 8761
  servlet:
    path: /
spring:
  application:
    name: spring-eureka-docker
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://localhost:8761/eureka

• 启动类

/**
 * <p>
 *
 * @author Leone
 * @since 2018-03-06
 **/
@EnableEurekaServer
@SpringBootApplication
public class DockerApplication {
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}

• Dockerfile

在src/main/docker目录下(没有则创建此目录)创建Dockerfile文件然后把maven编译后的jar文件拷贝到和Dockerfile同级的目录

# 基于哪个镜像
FROM java:8

# 将本地文件夹挂载到当前容器
VOLUME /tmp

# 维护者信息
MAINTAINER leone "exklin@gmail.com"

# 拷贝文件到容器
ADD spring-docker.jar eureka.jar

# 执行命令
RUN bash -c 'touch eureka.jar'

# 声明端口
EXPOSE 8761

# 配置容器启动后执行的命令
ENTRYPOINT ["java","-jar","-Djava.security.egd=file:/dev/./urandom","eureka.jar"]

安装 idea Docker 插件后需要在 windows 下安装 Docker 在docker 插件的 Deploy configuration 里面配置 docker 容器参数之后 点击Run后就会顺序执行 Dockerfile 里面的命令就会启动这个docker容器。打开浏览器访问http://localhost:8761,传送门