[root@izwz9eftauv7x69f5jvi96z docker]# vim /usr/lib/systemd/system/docker.service
#修改ExecStart这行
ExecStart=/usr/bin/dockerd  -H tcp://0.0.0.0:2375  -H unix:///var/run/docker.sock
#重新加载配置文件
[root@izwz9eftauv7x69f5jvi96z docker]# systemctl daemon-reload    
#重启服务
[root@izwz9eftauv7x69f5jvi96z docker]# systemctl restart docker.service 
#查看端口是否开启
[root@izwz9eftauv7x69f5jvi96z docker]# netstat -nlpt
#直接curl看是否生效
[root@izwz9eftauv7x69f5jvi96z docker]# curl http://127.0.0.1:2375/info

/**
 * DemoController
 *
 * @author weixiang.wu
 * @date 2018-11-08 17:26
 **/
@RestController
public class DemoController {

    @RequestMapping("test")
    public String demo() {
        return "demo for docker";
    }
}

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>dockercon</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

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

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <version>1.0.0</version>
                <configuration>
                    <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
                    <dockerDirectory></dockerDirectory>
                    <resources>
                        <resource>
                            <targetPath>/</targetPath>
                            <directory>${project.build.directory}</directory>
                            <include>${project.build.finalName}.jar</include>
                        </resource>
                    </resources>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

#指定基础镜像，在其上进行定制
FROM java:8

#维护者信息
MAINTAINER wuweixiang <wuweixiang.alex@gmail.com>

#这里的 /tmp 目录就会在运行时自动挂载为匿名卷，任何向 /tmp 中写入的信息都不会记录进容器存储层
VOLUME /tmp

#复制上下文目录下的target/demo-1.0.0.jar 到容器里
COPY target/demo-1.0.0.jar demo-1.0.0.jar

#bash方式执行，使demo-1.0.0.jar可访问
#RUN新建立一层，在其上执行这些命令，执行结束后， commit 这一层的修改，构成新的镜像。
RUN bash -c "touch /demo-1.0.0.jar"

#声明运行时容器提供服务端口，这只是一个声明，在运行时并不会因为这个声明应用就会开启这个端口的服务
EXPOSE 8080

#指定容器启动程序及参数   <ENTRYPOINT> "<CMD>"
ENTRYPOINT ["java","-jar","demo-1.0.0.jar"]

docker run -p 28080:8080 --name wwx wuweixiang/demo:1.0