该Dockerfile声明詹金斯主目录的卷

# Jenkins home directoy is a volume, so configuration and build history 
# can be persisted and survive image upgrades
VOLUME /var/jenkins_home

这意味着对Jenkins配置的所有更改都是在docker映像之外进行的。

更新资料

项目README描述了如何使用预安装的插件创建自己的派生docker映像。

• https://github.com/jenkinsci/docker/blob/master/README.md

例如

FROM jenkins
COPY plugins.txt /usr/share/jenkins/plugins.txt
RUN /usr/local/bin/plugins.sh /usr/share/jenkins/plugins.txt