遇到的问题：
公司java项目按老的方式打包出来一个fat jar，100MB, 推送到腾讯云镜像仓库很慢，8分钟。。。走的是公网，专线暂时还没配置好
以前是内网harbor，速度还不明显。
归根究底，一次推送100MB是个不合理的事情
思路：
- 了解spring boot打包，期望将依赖的libs 和 业务代码拆分
- 优化dockerfile，充分利用缓存
解决问题：
- 先修改spring-boot-maven-plugin，只打包业务代码。网上有些是配置exclude，我试了，恶心到了。。那么多包挨个找
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!--<mainClass>cn.qg.clotho.Bootstrap</mainClass>-->
<layout>ZIP</layout>
<!--<executable>true</executable>-->
<includes>
<include>
<groupId>${project.groupId}</groupId>
<artifactId>${project.artifactId}</artifactId>
</include>
</includes>
</configuration>
</plugin>
- 新增maven-dependency-plugin，将依赖移到libs目录下
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<type>jar</type>
<includeTypes>jar</includeTypes>
<includeScope>runtime</includeScope>
<outputDirectory>${project.build.directory}/libs</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
- 优化dockerfile
参考 https://medium.com/@nieldw/caching-maven-dependencies-in-a-docker-build-dca6ca7ad612 ，牛逼
FROM mvn3.5 as builder
WORKDIR /build
COPY pom.xml .
RUN mvn dependency:go-offline
COPY src/ /build/src/
RUN mvn package
FROM jdk1.8
EXPOSE 80
CMD exec java -Dloader.path="/home/libs/" -jar /home/app.jar
COPY --from=builder /build/target/*.jar /home/app.jar
COPY --from=builder /build/target/libs /home/libs/
搞定。最终代码变化每次推送也就1MB多
启动命令 java -Dloader.path="libs/" -jar app.jar
