一、开发前准备

1. Docker的安装可以参考https://docs.docker.com/install/

2. 配置docker远程连接端口

  vi /usr/lib/systemd/system/docker.service

找到 ExecStart，在最后面添加 -H tcp://0.0.0.0:2375，如下图所示

3. 重启docker



    
 systemctl daemon-reload
 systemctl start docker

4. 开放端口

firewall-cmd --zone=public --add-port=2375/tcp --permanent

5. Idea安装插件,重启

6. 连接远程docker

(1) 编辑配置

(2) 填远程docker地址

(3) 连接成功，会列出远程docker容器和镜像

二、新建项目

1. 创建springboot项目

项目结构图

(1) 配置pom文件


<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>4.0.0modelVersion>

    <groupId>docker-demogroupId>
    


    
<artifactId>com.demoartifactId>
    <version>1.0-SNAPSHOTversion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.0.2.RELEASEversion>
        <relativePath />
    parent>

    <properties>
         <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
         <docker.image.prefix>com.demodocker.image.prefix>
         <java.version>1.8java.version>
    properties>
    <build>
        <plugins>
          <plugin>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-maven-pluginartifactId>
          plugin>
        <plugin>



    
           <groupId>com.spotifygroupId>
           <artifactId>docker-maven-pluginartifactId>
           <version>1.0.0version>
           <configuration>
              <dockerDirectory>src/main/dockerdockerDirectory>
              <resources>
                <resource>
                    <targetPath>/targetPath>
                    <directory>${project.build.directory}directory>
                    <include>${project.build.finalName}.jarinclude>
                resource>
              resources>
           configuration>
        plugin>
        <plugin>
            <artifactId>maven-antrun-pluginartifactId>
            <executions>
                 <execution>
                     <phase>packagephase>
                    <configuration>
                        <tasks>
                            <copy todir


    
="src/main/docker" file="target/${project.artifactId}-${project.version}.${project.packaging}">copy>
                        tasks>
                     configuration>
                    <goals>
                        <goal>rungoal>
                    goals>
                    execution>
            executions>
        plugin>

       plugins>
    build>
<dependencies>
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-webartifactId>
    dependency>
    <dependency>
  <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-testartifactId>
        <scope>testscope>
    dependency>
    <dependency>
        <groupId>log4jgroupId>


    

        <artifactId>log4jartifactId>
        <version>1.2.17version>
    dependency>
dependencies>
project>

(2) 在src/main目录下创建docker目录，并创建Dockerfile文件

FROM openjdk:8-jdk-alpine
ADD *.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

(3) 在resource目录下创建application.properties文件

logging.config=classpath:logback.xml
logging.path=/home/developer/app/logs/
server.port=8990

(4) 创建DockerApplication文件

@SpringBootApplication
public class DockerApplication {
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}

(5) 创建DockerController文件

@RestController
public class DockerController {



    
    static Log log = LogFactory.getLog(DockerController.class);

    @RequestMapping("/")
    public String index() {
        log.info("Hello Docker!");
        return "Hello Docker!";
    }
}

(6) 增加配置

命令解释
Image tag :指定镜像名称和tag，镜像名称为 docker-demo，tag为1.1
Bind ports :绑定宿主机端口到容器内部端口。格式为[宿主机端口]:[容器内部端口]
Bind mounts :将宿主机目录挂到到容器内部目录中。格式为[宿主机目录]:[容器内部目录]。这个springboot项目会将日志打印在容器 /home/developer/app/logs/目录下，将宿主机目录挂载到容器内部目录后，那么日志就会持久化容器外部的宿主机目录中。