參考：

https://my.oschina.net/shyloveliyi/blog/1627020

1、首先下載jre，下載地址是https://www.java.com/en/download/manual.jsp，大概是77M。

2、解壓jre包，刪除根目錄下文本文件，然後刪除其他不必要文件。

#解壓
tar xvcf jre-8u161-linux-x64.tar.gz
#進入目錄
cd jre1.8.0_161/
#刪除文本文件
rm -rf COPYRIGHT LICENSE README release THIRDPARTYLICENSEREADME-JAVAFX.txtTHIRDPARTYLICENSEREADME.txt Welcome.html
#刪除其他無用文件
rm -rf     lib/plugin.jar            lib/ext/jfxrt.jar            bin/javaws            lib/javaws.jar            lib/desktop            plugin            lib/deploy*            lib/*javafx*            lib/*jfx*            lib/amd64/libdecora_sse.so            lib/amd64/libprism_*.so            lib/amd64/libfxplugins.so            lib/amd64/libglass.so            lib/amd64/libgstreamer-lite.so            lib/amd64/libjavafx*.so            lib/amd64/libjfx*.so
 

3、重新打包所有文件(不打包也可以，在Dockerfile裏ADD這個目錄即可，當前精簡完jre目錄大小是107M，壓縮後是41M)

tar zcvf jre8.tar.gz *

4、創建Dockerfile

# using alpine-glibc instead of alpine  is mainly because JDK relies on glibc
FROM docker.io/jeanblanchard/alpine-glibc
# author
MAINTAINER scc <[email protected]>
# A streamlined jre
ADD jre8.tar.gz /usr/java/jdk/
# set env
ENV JAVA_HOME /usr/java/jdk
ENV PATH ${PATH}:${JAVA_HOME}/bin
# run container with base path:/opt
WORKDIR /opt
 

5、構建（整體大小是122M）

docker build -t voole/java8:1.0 .

6、測試運行

# docker run -it voole/java8:1.0
/opt # java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

構建最小JDK Docker鏡像