docker部署spring boot项目（两种构建Docker镜像方式）

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一、通过插件方式

代码： 

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/**
 * @Description TODO
 * @Author huyunshun 2019/8/14
 */
@SpringBootApplication
@RestController
public class Application {

    @RequestMapping("/")
    public String demo() {
        return "Docker";
    }

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

}
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server:
  port: 8000

Pom：

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<?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.hu</groupId>
    <artifactId>docker-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-parent</artifactId>
        <version>2.1.3.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    <properties>
        <docker.image.prefix>springboot</docker.image.prefix>
    </properties>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                        <mainClass>com.hu.Application</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </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>-->
                    <imageName>hu/dockerdemo</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>
</project>

Dockerfile: 

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

#构建 Jdk 基础环境，添加 Spring Boot Jar 到镜像中，简单解释一下:
#
#FROM ，表示使用 Jdk8 环境 为基础镜像，如果镜像不是本地的会从 DockerHub 进行下载
#VOLUME ，VOLUME 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。这个命令的效果是：在宿主机的/var/lib/docker目录下创建一个临时文件并把它链接到容器中的/tmp目录
#ADD ，拷贝文件并且重命名
#ENTRYPOINT ，为了缩短 Tomcat 的启动时间，添加java.security.egd的系统属性指向/dev/urandom作为 ENTRYPOINT

首先，保证 通过mvn package 打包运行，没有问题。

再进行构建镜像：

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PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo> mvn package docker:build
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------------< com.hu:docker-demo >-------------------------
[INFO] Building docker-demo 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ docker-demo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ docker-demo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ docker-demo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:testCompile (default-testCompile) @ docker-demo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.22.1:test (default-test) @ docker-demo ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:3.1.1:jar (default-jar) @ docker-demo ---
[INFO]
[INFO] --- spring-boot-maven-plugin:2.1.3.RELEASE:repackage (default) @ docker-demo ---
[INFO] Replacing main artifact with repackaged archive
[INFO]
[INFO] --- docker-maven-plugin:1.0.0:build (default-cli) @ docker-demo ---
[INFO] Using authentication suppliers: [ConfigFileRegistryAuthSupplier]
[INFO] Copying D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\target\docker-demo-1.0-SNAPSHOT.jar -> D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\target\docker\docker-demo-1.0-SNAPSHOT.jar
[INFO] Copying src\main\docker\Dockerfile -> D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\target\docker\Dockerfile
[INFO] Building image hu/dockerdemo
Step 1/4 : FROM openjdk:8-jdk-alpine

Pulling from library/openjdk
e7c96db7181b: Pull complete
f910a506b6cb: Pull complete
c2274a1a0e27: Pull complete
Digest: sha256:94792824df2df33402f201713f932b58cb9de94a0cd524164a0f2283343547b3
Status: Downloaded newer image for openjdk:8-jdk-alpine
 ---> a3562aa0b991
Step 2/4 : VOLUME /tmp

 ---> Running in 85aea02ce334
Removing intermediate container 85aea02ce334
 ---> b32bc2fbb3f0
Step 3/4 : ADD docker-demo-1.0-SNAPSHOT.jar app.jar

 ---> 909569c00d0d
Step 4/4 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

 ---> Running in 88c174756528
Removing intermediate container 88c174756528
 ---> b3ca1f38330a
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built b3ca1f38330a
Successfully tagged hu/dockerdemo:latest
[INFO] Built hu/dockerdemo
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  52.666 s
[INFO] Finished at: 2019-08-15T11:47:14+08:00
[INFO] ------------------------------------------------------------------------

查看镜像：

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PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo> docker images
REPOSITORY                                      TAG                 IMAGE ID            CREATED              SIZE
hu/dockerdemo                                   latest              b3ca1f38330a        About a minute ago   122MB

运行：

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PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo> docker run --name docker-demo-springboot -p 8000:8000 b3ca1f38330a

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.3.RELEASE)

启动完成后；就可以访问。

遇到的问题：

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[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:1.0.0:build (default-cli) on project docker-demo: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: org.apache.http.conn.HttpHostConnectException: Connect to localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect -> [Help 1]

设置下docker

二、普通方式

上面的Dockerfile 和 springBoot 打包的项目(可以在pom中去掉docker插件)docker-demo-1.0-SNAPSHOT.jar放到一个目录中

执行指令：docker build -t hu-docker-demo .

执行docker build命令，docker就会根据Dockerfile里你定义好的命令进行构建新的镜像。

-t ：指定要创建的目标镜像名 名字:镜像的tag
.代表当前目录，也就是Dockerfile所在的目录,可以指定Dockerfile 的绝对路径。 

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PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\1111> docker build -t hu-docker-demo .
Sending build context to Docker daemon  16.72MB
Step 1/4 : FROM openjdk:8-jdk-alpine
 ---> a3562aa0b991
Step 2/4 : VOLUME /tmp
 ---> Using cache
 ---> b32bc2fbb3f0
Step 3/4 : ADD docker-demo-1.0-SNAPSHOT.jar app.jar
 ---> Using cache
 ---> 48f1eb33fed5
Step 4/4 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
 ---> Using cache
 ---> 5e7b25db2cbf
Successfully built 5e7b25db2cbf
Successfully tagged hu-docker-demo:latest
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

#增加了镜像
PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\1111> docker images
REPOSITORY                                      TAG                 IMAGE ID            CREATED             SIZE
docker                                          latest              5e7b25db2cbf        9 minutes ago       122MB
hu-docker-demo                                  latest              5e7b25db2cbf        9 minutes ago       122MB

#运行
PS D:\java-workspaces\idea-work\spring-boot-sample-demo\docker-demo\1111> docker run --name docker-demo-hu -p 8000:8000 hu-docker-demo

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.3.RELEASE)

2019-08-15 05:50:27.972  INFO 1 --- [           main] com.hu.Application                       : Starting Application on 842d73789909 with PID 1 (/app.jar started by root in /)
2019-08-15 05:50:27.982  INFO 1 --- [           main] com.hu.Application                       : No active profile set, falling back to default profiles: default
2019-08-15 05:50:29.357  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8000 (http)
2019-08-15 05:50:29.390  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-08-15 05:50:29.391  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.16]
2019-08-15 05:50:29.403  INFO 1 --- [           main] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
2019-08-15 05:50:29.470  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-08-15 05:50:29.470  INFO 1 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1392 ms
2019-08-15 05:50:29.701  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-08-15 05:50:30.044  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8000 (http) with context path ''
2019-08-15 05:50:30.048  INFO 1 --- [           main] com.hu.Application                       : Started Application in 2.773 seconds (JVM running for 3.202)

完成！

提交镜像到hub.docker.com网站；
执行docker login登录，期间会要求输入用户名和密码；

执行命令docker push hu-docker-demo，即可将本地镜像push到hub.docker.com； 注意镜像名称的前缀，例如我这里的前缀是bolingcavalry，要和账号保持一致；

提交成功后，在hub.docker.com网站即可看到此镜像，如下图，此时任何人都可以pull来下使用了

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