Docker部署SpringBoot项目

每个优秀的人，背后都有一段沉默的时光

前言

今天完成对SpringBoot项目的部署。

准备好SpringBoot项目

构建一个SpringBoot项目，写一个路由hello，访问返回hello world, docker!。

@Slf4j  
@RestController  
@SpringBootApplication  
public class DockerWebApplication implements CommandLineRunner {  
  
    @Value("${spring.application.name}")  
    private String applicationName;  
  
    public static void main(String[] args) {  
        SpringApplication.run(DockerWebApplication.class, args);  
    }  
  
    @GetMapping(value = "/hello")  
    public String hello() {  
        log.info("[hello] hello world, docker!");  
        return "hello world, docker!";  
    }  
  
    @Override  
    public void run(String... args) throws Exception {  
        log.info("{} 启动成功...", applicationName);  
    }  
}

对项目进行打包

在项目根目录运行mvn clean package将项目打包成jar包，完成之后会在target目录下生成一个可执行的jar文件。

<build>  
    <plugins>
	<!--打包-->
        <plugin>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-maven-plugin</artifactId>  
		<configuration>
			   <mainClass>com.ronan.docker.DockerWebApplication</mainClass>  
            </configuration>        
        </plugin>    
    </plugins>
</build>

编写Dockerfile

在项目根目录编写Dockerfile文件

# 指定基础镜像
FROM java:8  

# 指向了一个`/tmp`的目录，由于Spring Boot使用内置的Tomcat容器，Tomcat默认使用`/tmp`作为工作目录。
VOLUME /tmp

# 项目的`ronan-docker-web.jar`作为`app.jar`添加到容器
ADD ronan-docker-web.jar app.jar

# 指定与外界交互的端口9090
EXPOSE 9090  

# 执行项目app.jar
ENTRYPOINT ["java","-jar","app.jar"]

将jar文件和Dockerfile文件上传到服务器

用工具将jar文件和Dockerfile文件上传到服务器的/workspace工作目录

# 制作镜像
[root@izwz9gvghuefob3ifhv3ppz docker-web]# docker build -t ronan-docker-web .
Sending build context to Docker daemon  19.52MB
Step 1/5 : FROM java:8
 ---> d23bdf5b1b1b
Step 2/5 : VOLUME /tmp
 ---> Running in 76e275045769
Removing intermediate container 76e275045769
 ---> 4493e9815453
Step 3/5 : ADD ronan-docker-web.jar app.jar
 ---> 4de7c3e65497
Step 4/5 : EXPOSE 9090
 ---> Running in efae4a77e05b
Removing intermediate container efae4a77e05b
 ---> cba2a305f4e2
Step 5/5 : ENTRYPOINT ["java","-jar","app.jar"]
 ---> Running in 45641296e12e
Removing intermediate container 45641296e12e
 ---> 1a8a3e60bd47
Successfully built 1a8a3e60bd47
Successfully tagged ronan-docker-web:latest

# 查看镜像
[root@izwz9gvghuefob3ifhv3ppz docker-web]# docker images
REPOSITORY         TAG       IMAGE ID       CREATED          SIZE
ronan-docker-web   latest    1a8a3e60bd47   19 seconds ago   663MB
java               8         d23bdf5b1b1b   5 years ago      643MB

# 创建容器
[root@izwz9gvghuefob3ifhv3ppz docker-web]# docker run -itd --name ronan-docker-web-1 -p 9090:9090 ronan-docker-web:latest
0d0ce82668e3f01f8022e013383018db4ca54195af00de9af74385e7342a4324
# 查看容器
[root@izwz9gvghuefob3ifhv3ppz docker-web]# docker ps -a
CONTAINER ID   IMAGE                     COMMAND               CREATED         STATUS         PORTS                    NAMES
0d0ce82668e3   ronan-docker-web:latest   "java -jar app.jar"   6 seconds ago   Up 5 seconds   0.0.0.0:9090->9090/tcp   ronan-docker-web-1

# 进入容器
[root@izwz9gvghuefob3ifhv3ppz docker-web]# docker exec -it 0d0ce82668e3 bash
root@0d0ce82668e3:/# ls -l
total 19124
-rw-r--r--  1 root root 19515332 May  9 16:27 app.jar
drwxr-xr-x  1 root root     4096 Jan 17  2017 bin
drwxr-xr-x  2 root root     4096 Dec 28  2016 boot
drwxr-xr-x  5 root root      360 May 10 15:25 dev
drwxr-xr-x  1 root root     4096 May 10 15:25 etc
drwxr-xr-x  2 root root     4096 Dec 28  2016 home
drwxr-xr-x  1 root root     4096 Jan 17  2017 lib
drwxr-xr-x  2 root root     4096 Jan 16  2017 lib64
drwxr-xr-x  2 root root     4096 Jan 16  2017 media
drwxr-xr-x  2 root root     4096 Jan 16  2017 mnt
drwxr-xr-x  2 root root     4096 Jan 16  2017 opt
dr-xr-xr-x 92 root root        0 May 10 15:25 proc
drwx------  2 root root     4096 Jan 16  2017 root
drwxr-xr-x  3 root root     4096 Jan 16  2017 run
drwxr-xr-x  2 root root     4096 Jan 16  2017 sbin
drwxr-xr-x  2 root root     4096 Jan 16  2017 srv
dr-xr-xr-x 13 root root        0 Jun 29  2021 sys
drwxrwxrwt  5 root root     4096 May 10 15:25 tmp
drwxr-xr-x  1 root root     4096 Jan 17  2017 usr
drwxr-xr-x  1 root root     4096 Jan 17  2017 var

测试成功

# 请求
ronan@luonandeMacBook-Pro ~ % curl http://120.77.35.233:9090/hello

hello world, docker!

总结

本文是一个Docker部署SpringBoot项目的示例，万变不离其宗。