之所以如此操作，主要原因是，官版的镜像中默认的setting.xml已内置好，不容易修改，
重新二次打包，可以指定我们自己的setting.xml配置，配置自己的私服地址以及解决默认Maven仓库国内下载速度慢的问题

一、创建操作目录

$ cd ~
$ mkdir -p dockerfiles/maven

二、创建 settings.xml 和 Dockerfile

$ cd dockerfiles/maven
$ touch settings.xml Dockerfile

三、编辑 settings.xml 以下供参考

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd"><localRepository>/root/.m2</localRepository><pluginGroups></pluginGroups><proxies></proxies><servers><server><id>maven-public</id><username>anonymous</username></server><server><id>maven-inner</id><username>test</username><password>test</password></server><server><id>maven-releases</id><username>test</username><password>test</password></server><server><id>maven-snapshots</id><username>test</username><password>test</password></server><server><id>docker-registry</id><username>test</username><password>test</password></server></servers><mirrors><mirror><id>alimaven</id><name>aliyun maven</name><url>http://maven.aliyun.com/nexus/content/groups/public/</url><mirrorOf>central</mirrorOf></mirror><!--配置阿里云maven私有仓库（即配阿里私服）--><mirror><id>alimaven</id><mirrorOf>*</mirrorOf><url>https://maven.aliyun.com/repository/central</url></mirror><!-- maven官方镜像 --><mirror><id>mirrorId</id><mirrorOf>central</mirrorOf><name>Human Readable Name </name><url>https://repo1.maven.org/maven2/</url></mirror><!-- 阿里云镜像1 --><mirror><id>alimaven</id><name>aliyun maven</name><url>https://central.maven.org/maven2</url><mirrorOf>central</mirrorOf></mirror><!-- 阿里云镜像2 --><mirror><id>alimaven</id><name>aliyun maven</name><url>https://maven.aliyun.com/nexus/content/repositories/central/</url><mirrorOf>central</mirrorOf></mirror></mirrors><profiles><profile><id>chenrise-outer</id><repositories><repository><id>maven-public</id><name>Chenrise Maven Http</name><url>http://maven.test.com/repository/maven-public/</url><layout>default</layout><releases><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>warn</checksumPolicy></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots></repository></repositories></profile><profile><id>chenrise-inner</id><repositories><repository><id>maven-work</id><name>Chenrise Maven Http</name><url>http://192.168.1.190:8081/repository/maven-public/</url>
<!--                    <url>http://nexus.jljianxing.work/repository/maven-public/</url>--><layout>default</layout><releases><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>warn</checksumPolicy></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots></repository></repositories></profile></profiles><activeProfiles><activeProfile>chenrise-inner</activeProfile>
<!--        <activeProfile>chenrise-inner</activeProfile>--></activeProfiles>
</settings>

编辑settings.xml，主要是对maven的repository与mirror进行配置，内容如下

四、编辑Dockerfile，

来源于 maven:3.6.0-jdk-8-alpine，把编写好的配置settings.xml复制到镜像内即可

FROM maven:3.6.0-jdk-8-alpine
COPY settings.xml /usr/share/maven/ref/

五、构建镜像

$ docker build -t maven:3.5-jdk-8 .

其中maven指的是自定义镜像中的 REPOSITORY
3.5-jdk-8指的是自定义镜像中的 TAG

六、查看镜像

$ docker image ls

七、将自定义的镜像推送到自己的harbor仓库

# 如服务器未登录过，需先使用以下命令登录后再推送
# $ docker login harbor.test.com
$ docker push harbor.test.com/jx-common/maven:3.5-jdk-8

八、使用自定义镜像