使用Docker部署SpringBoot项目的实现方法

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.0.0.RELEASE</version>
</parent>

<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>

@RestController
public class DockerController {
 
  @RequestMapping("/")
  public String index() {
    return "Hello Docker!";
  }
}

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

<properties>
 <docker.image.prefix>springboot</docker.image.prefix>
</properties>

<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>1.0.0</version>
  <configuration>
  <imageName>${docker.image.prefix}/${project.artifactId}</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>
 <!-- Docker maven plugin -->
 </plugins>
</build>

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ADD spring-boot-docker-1.0.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

yum install docker

service docker start
chkconfig docker on
 
#LCTT 译注：此处采用了旧式的 sysv 语法，如采用CentOS 7中支持的新式 systemd 语法，如下：
systemctl start docker.service
systemctl enable docker.service

vi /etc/docker/daemon.json
 
#添加后：
{
  "registry-mirrors": ["https://registry.docker-cn.com"],
  "live-restore": true
}

systemctl restart docker

yum -y install java-1.8.0-openjdk*

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

## 解压
tar vxf apache-maven-3.5.2-bin.tar.gz
## 移动
mv apache-maven-3.5.2 /usr/local/maven3

MAVEN_HOME=/usr/local/maven3
export MAVEN_HOME
export PATH=${PATH}:${MAVEN_HOME}/bin

#打包
mvn package
#启动
java -jar target/spring-boot-docker-1.0.jar

mvn package docker:build

...
Step 1 : FROM openjdk:8-jdk-alpine
 ---> 224765a6bdbe
Step 2 : VOLUME /tmp
 ---> Using cache
 ---> b4e86cc8654e
Step 3 : ADD spring-boot-docker-1.0.jar app.jar
 ---> a20fe75963ab
Removing intermediate container 593ee5e1ea51
Step 4 : ENTRYPOINT java -Djava.security.egd=file:/dev/./urandom -jar /app.jar
 ---> Running in 85d558a10cd4
 ---> 7102f08b5e95
Removing intermediate container 85d558a10cd4
Successfully built 7102f08b5e95
[INFO] Built springboot/spring-boot-docker
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 54.346 s
[INFO] Finished at: 2018-03-13T16:20:15+08:00
[INFO] Final Memory: 42M/182M
[INFO] ------------------------------------------------------------------------

docker images
REPOSITORY           TAG         IMAGE ID      CREATED       SIZE
springboot/spring-boot-docker  latest       99ce9468da74    6 seconds ago    117.5 MB

docker run -p 8080:8080 -t springboot/spring-boot-docker

docker ps
CONTAINER ID    IMAGE              COMMAND         CREATED       STATUS       PORTS          NAMES
049570da86a9    springboot/spring-boot-docker  "java -Djava.security"  30 seconds ago   Up 27 seconds    0.0.0.0:8080->8080/tcp  determined_mahavira

Hello Docker!