docker 制作最小化Java镜像

前提：目前大部分的java images都是根据centos和Ubuntu做的，结果是镜像非常大，基本上300-500m，太影响docker的使用了。

思路：换更加轻量级的linux系统，删除jdk中无关的东西

先下载jdk的tar包，然后删除jdk中无关的东西

将jdk1.6.0_33.tgz 解压到 /usr/java/jdk

    rm -rf /usr/java/jdk/*src.zip \
           /usr/java/jdk/lib/missioncontrol \
           /usr/java/jdk/lib/visualvm \
           /usr/java/jdk/lib/*javafx* \
           /usr/java/jdk/jre/lib/plugin.jar \
           /usr/java/jdk/jre/lib/ext/jfxrt.jar \
           /usr/java/jdk/jre/bin/javaws \
           /usr/java/jdk/jre/lib/javaws.jar \
           /usr/java/jdk/jre/lib/desktop \
           /usr/java/jdk/jre/plugin \
           /usr/java/jdk/jre/lib/deploy* \
           /usr/java/jdk/jre/lib/*javafx* \
           /usr/java/jdk/jre/lib/*jfx* \
           /usr/java/jdk/jre/lib/amd64/libdecora_sse.so \
           /usr/java/jdk/jre/lib/amd64/libprism_*.so \
           /usr/java/jdk/jre/lib/amd64/libfxplugins.so \
           /usr/java/jdk/jre/lib/amd64/libglass.so \
           /usr/java/jdk/jre/lib/amd64/libgstreamer-lite.so \
           /usr/java/jdk/jre/lib/amd64/libjavafx*.so \
           /usr/java/jdk/jre/lib/amd64/libjfx*.so

以下dockerfile 基于 AlpineLinux

#Alpine Linux with a glibc-2.21 and Oracle Java 7
FROM docker.io/jeanblanchard/alpine-glibc

#MAINTAINER Fox Chan

#Java Version
#ENV JAVA_VERSION_MAJOR 7
#ENV JAVA_VERSION_MINOR 60
#ENV JAVA_PACKAGE       jdk

#install java
ADD jdk /usr/java/jdk

# Set environment
ENV JAVA_HOME /usr/java/jdk
ENV PATH ${PATH}:${JAVA_HOME}/bin

才 158.3 MB，太酷了！