安装docker

菜鸟教程

springboot项目

maven依赖

<?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>boottest</groupId><artifactId>com.ityang.boot</artifactId><version>1.0-SNAPSHOT</version><name>boottest</name><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.3.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><properties><java.version>1.8</java.version></properties><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

启动和rest服务类

@SpringBootApplication
@RestController
public class StartApp {public static void main(String[] args) {SpringApplication.run(StartApp.class, args);}@RequestMapping("/")public String index() {return "hello spring boot";}
}

启动项目，浏览器访问 localhost:8080

编写Dockerfile

在项目 /src/main目录下新建目录docker，在/src/main/docker下新建文件 Dockerfile，内容为：

# 基础镜像 这里使用国内网易镜像
FROM hub.c.163.com/dwyane/openjdk:8
#挂载宿主/tmp目录到容器的/tmp目录
VOLUME /tmp
# 拷贝文件(maven打包后的jar文件)，并重命名为 app.jar
ADD com.ityang.boot-1.0-SNAPSHOT.jar app.jar
# 启动容器后执行一些命令
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

项目添加docker-maven-plugin插件

<!-- Docker maven plugin start --><plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><version>0.4.13</version><configuration><!--[a-z 0-9] 不然docker:build会报错--><imageName>dockerspringboot</imageName>
<dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources></configuration></plugin><!-- Docker maven plugin end -->

需要注意的是，镜像名称必须为 a-z（小写）和0-9 的值，否则docker:build 报错

构建镜像文件

执行命令：

$ mvn clean package  docker:build

或者分开执行：

$ mvn clean package
$ mvn docker:build

部分控制台信息：

[INFO] --- docker-maven-plugin:0.4.13:build (default-cli) @ com.ityang.boot ---
[INFO] Copying /Users/yangzhenlong/projs/my/boot-test/target/com.ityang.boot-1.0-SNAPSHOT.jar -> /Users/yangzhenlong/projs/my/boot-test/target/docker/com.ityang.boot-1.0-SNAPSHOT.jar
[INFO] Copying /Users/yangzhenlong/projs/my/boot-test/src/main/docker/Dockerfile -> /Users/yangzhenlong/projs/my/boot-test/target/docker/Dockerfile
[INFO] Building image dockerspringboot
Step 1/4 : FROM hub.c.163.com/dwyane/openjdk:8---> 96cddf5ae9f1
Step 2/4 : VOLUME /tmp---> Running in 0dab3c046923
Removing intermediate container 0dab3c046923---> 2e62fad6a16a
Step 3/4 : ADD com.ityang.boot-1.0-SNAPSHOT.jar app.jar---> a966ed4c8748
Step 4/4 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]---> Running in 4ec1c4990022
Removing intermediate container 4ec1c4990022---> 02b677ad12e1
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built 02b677ad12e1
Successfully tagged dockerspringboot:latest
[INFO] Built dockerspringboot
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.475 s
[INFO] Finished at: 2018-11-17T01:24:57+08:00
[INFO] ------------------------------------------------------------------------

通过docker镜像启动容器

查看镜像

$ docker images

启动容器

$ docker run -p 8080:8080 -d dockerspringboot
cbc89f9e0cd584f1405d7177098423f5b576d668f7aee6ff7dfb5b4e34154862

解释：

-p 8080:8080 #容器端口映射到宿主端口，格式为：主机(宿主)端口:容器端口
-d #后台运行容器，并返回容器ID

查看运行的容器

$ docker ps

浏览器访问 loalhost:8080