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

systemctl daemon-reload
 systemctl restart docker

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

<"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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.fengqi</groupId>
    <artifactId>dockerDemo</artifactId>
    <version>1.0.0</version>
    <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.fengqi</groupId>
  <artifactId>web</artifactId>
  <version>1.0.0</version>
  <name>web</name>
  <description>Demo project for Spring Boot</description>
  
 <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>
 
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </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>
          <dockerDirectory>src/main/docker</dockerDirectory>
          <resources>
            <resource>
              <targetPath>/</targetPath>
              <directory>${project.build.directory}</directory>
              <include>${project.build.finalName}.jar</include>
            </resource>
          </resources>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-antrun-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <configuration>
              <tasks>
                <copy todir="src/main/docker" file="target/${project.artifactId}-${project.version}.${project.packaging}"></copy>
              </tasks>
            </configuration>
            <goals>
              <goal>run</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

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

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

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

@RestController
public class DockerController {
 static Log log = LogFactory.getLog(DockerController.class);
 @RequestMapping("/")
 public String index() {
 log.info("Hello Docker!");
 return "Hello Docker!";
 }
}