使用Docker Maven 插件进行镜像的创建以及上传至私服

1.在进行服务容器化部署的时候，需要将服务以及其运行的环境整个打包做成一个镜像，打包的过程有两种办法，第一种是首选通过maven打成jar包，然后再编写dockerfile，执行docker build 手动构建docker镜像，然后再上传至仓库。第二种是使用docker maven 插件，它可以模拟上述过程，将手动编写dockerfile 的过程使用插件完成，并上传至私服。

2.首先，打开docker 的远程操作，docker 默认是关闭的。

编辑宿主机的  /lib/systemd/system/docker.service 文件，将ExecStart 开头的一行修改为：

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix://var/run/docker.sock

然后分别重载配置，重启服务

systemctl daemon-reload

service docker restart

接下来访问宿主机的2375端口即可显示如下：

ip:2375/version

{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"19.03.4","Details":{"ApiVersion":"1.40","Arch":"amd64","BuildTime":"2019-10-18T15:50:54.000000000+00:00","Experimental":"false","GitCommit":"9013bf583a","GoVersion":"go1.12.10","KernelVersion":"3.10.0-1062.el7.x86_64","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.2.10","Details":{"GitCommit":"b34a5c8af56e510852c35414db4c1f4fa6172339"}},{"Name":"runc","Version":"1.0.0-rc8+dev","Details":{"GitCommit":"3e425f80a8c931f88e6d94a8c831b9d5aa481657"}},{"Name":"docker-init","Version":"0.18.0","Details":{"GitCommit":"fec3683"}}],"Version":"19.03.4","ApiVersion":"1.40","MinAPIVersion":"1.12","GitCommit":"9013bf583a","GoVersion":"go1.12.10","Os":"linux","Arch":"amd64","KernelVersion":"3.10.0-1062.el7.x86_64","BuildTime":"2019-10-18T15:50:54.000000000+00:00"}

3.安装私服。docker 的私服是企业将自己开发的应用打包成镜像放到自己的仓库中，区别于docker hub。概念类似于maven 的私服或者gitlab。私服也是容器化的服务，直接拉镜像运行即可。

首先拉取registry镜像，docker pull registry

tomcat                                latest              882487b8be1d        7 weeks ago         507MB
nginx                                 latest              5a9061639d0a        7 weeks ago         126MB
redis                                 latest              de25a81a5a0b        7 weeks ago         98.2MB
portainer/portainer                   latest              4cda95efb0e4        8 weeks ago         80.6MB
registry                              latest              f32a97de94e1        9 months ago        25.8MB

然后运行，docker run -di --name=registry -p 5000:5000 --restart=always registry

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS                    NAMES
c826962e4379        registry            "/entrypoint.sh /etc…"   4 hours ago         Up About an hour           0.0.0.0:5000->5000/tcp   registry
c4f8db3bbc83        aac681e42c42        "/bin/sh -c 'java -j…"   3 weeks ago         Exited (143) 3 hours ago                            eureka-server

最后修改配置，让docker 信任私服。进入/etc/docker/daemon.json 将内容修改为：

{
  "registry-mirrors": ["https://****.mirror.aliyuncs.com"],
  "insecure-registries":["192.168.59.133:5000"]
}

上面的  registry-mirrors 是我自己配置的阿里云的加速地址，可以忽略，下面的  insecure-registries 配置的私服的ip:port，修改完以后执行：

systemctl daemon-reload

service docker restart

重载配置重启服务。重启服务以后记得将registry重新运行，或者可以在启动容器时 通过--restart 指定重启策略，指定为always 即可。随后访问 宿主机的 ip:port/v2/_catalog 可以看到：

{"repositories":[]}

4.使用docker maven 插件

在要打包的工程pom文件中添加docker maven 插件

<build>
        <finalName>app</finalName>
        <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>0.4.13</version>
                <configuration>
                    <imageName>192.168.59.133:5000/${project.artifactId}:${project.version}</imageName>
                    <baseImage>jdk1.8:1.0</baseImage>
                    <entryPoint>["java", "‐jar","/${project.build.finalName}.jar"]</entryPoint>
                    <resources>
                        <resource>
                            <targetPath>/</targetPath>
                            <directory>${project.build.directory}
                            </directory>
                            <include>${project.build.finalName}.jar</include>
                        </resource>
                    </resources>
                    <dockerHost>http://192.168.59.133:2375</dockerHost>
                </configuration>
            </plugin>
        </plugins>
    </build>

需要说明的是以下几点：

（1）imageName 指定生成的镜像名称，前面的ip:port 指定的是私服的地址，后面是名称和tag

192.168.59.133:5000/${project.artifactId}:${project.version}

（2）baseImage 指定基础镜像名称，相当于dockerfile 中的FROM ，jdk1.8是我自己构建的一个安装了jdk1.8的镜像

jdk1.8                                1.0                 b834c0fcc837        4 hours ago         585MB
mycentos                              0.1                 aac681e42c42        3 weeks ago         655MB
tomcat                                latest              882487b8be1d        7 weeks ago         507MB
nginx                                 latest              5a9061639d0a        7 weeks ago         126MB

（3）dockerHost 指定安装docker 服务的宿主机的ip 和port

5.执行打包

在控制台执行

mvn clean package docker:build -Dmaven.test.skip=true -DpushImage

跳过单元测试，并同时将镜像上传至私服。可以看到将打印出以下日志：

[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.java:design-parttern >----------------------
[INFO] Building design-parttern 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ design-parttern ---
[INFO] Deleting C:\common\design-parttern\target
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ design-parttern ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ design-parttern ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 45 source files to C:\common\design-parttern\target\classes
[INFO] /C:/common/design-parttern/src/main/java/com/java/dp/factory/FactoryMain.java: C:\common\design-parttern\src\main\java\com\java\dp\factory\FactoryMain.java使用了未经检查或不安全的操作。
[INFO] /C:/common/design-parttern/src/main/java/com/java/dp/factory/FactoryMain.java: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ design-parttern ---
[INFO] Not copying test resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ design-parttern ---
[INFO] Not compiling test sources
[INFO]
[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ design-parttern ---
[INFO] Tests are skipped.
[INFO]
[INFO] --- maven-jar-plugin:3.1.2:jar (default-jar) @ design-parttern ---
[INFO] Building jar: C:\common\design-parttern\target\app.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.2.1.RELEASE:repackage (repackage) @ design-parttern ---
[INFO] Replacing main artifact with repackaged archive
[INFO]
[INFO] --- docker-maven-plugin:0.4.13:build (default-cli) @ design-parttern ---
[INFO] Copying C:\common\design-parttern\target\app.jar -> C:\common\design-parttern\target\docker\app.jar
[INFO] Building image 192.168.59.133:5000/design-parttern:0.0.1-SNAPSHOT
Step 1/3 : FROM jdk1.8:1.0

 ---> b834c0fcc837
Step 2/3 : ADD /app.jar //

 ---> fcfc87345066
Step 3/3 : ENTRYPOINT ["java", "‐jar","/app.jar"]

 ---> Running in d11496ba57df
Removing intermediate container d11496ba57df
 ---> 9c13f6795943
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built 9c13f6795943
Successfully tagged 192.168.59.133:5000/design-parttern:0.0.1-SNAPSHOT
[INFO] Built 192.168.59.133:5000/design-parttern:0.0.1-SNAPSHOT
[INFO] Pushing 192.168.59.133:5000/design-parttern:0.0.1-SNAPSHOT
The push refers to repository [192.168.59.133:5000/design-parttern]
f84c21ed068b: Pushed
a52095cbb8d6: Pushed
8b67330a55d1: Pushed
9e607bb861a7: Pushed
0.0.1-SNAPSHOT: digest: sha256:3ec3d50af6c47400513ba8a5d574526408cad3b117057ea85753960c04505042 size: 1166
null: null
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  29.419 s
[INFO] Finished at: 2019-12-09T17:42:56+08:00
[INFO] ------------------------------------------------------------------------

查看docker 镜像发现我们的宿主机上已经有了镜像，docker images

REPOSITORY                            TAG                 IMAGE ID            CREATED             SIZE
192.168.59.133:5000/design-parttern   0.0.1-SNAPSHOT      9c13f6795943        2 hours ago         605MB
jdk1.8                                1.0                 b834c0fcc837        4 hours ago         585MB
mycentos                              0.1                 aac681e42c42        3 weeks ago         655MB
tomcat                                latest              882487b8be1d        7 weeks ago         507MB
nginx                                 latest              5a9061639d0a        7 weeks ago         126MB
redis                                 latest              de25a81a5a0b        7 weeks ago         98.2MB

而且访问我们的私服也可以看到已经上传了镜像，http://192.168.59.133:5000/v2/_catalog

{"repositories":["design-parttern"]}