docker最小java鏡像建構

1. 下載下傳對應環境的java-jre

下載下傳頁面: https://www.java.com/en/download/manual.jsp
           

2. 伺服器上建立目錄并上傳下載下傳的壓縮包

示例目錄是**/opt/java**

建立shell腳本檔案clean-java.sh，輸入如下内容

#!/bin/sh
mkdir -p /opt/java
cd /opt/java
# 解壓
tar -xzvf jre-8u281-linux-x64.tar.gz
cd jre-8u281-linux-x64
# 移除多餘檔案
rm -rf COPYRIGHT LICENSE README release THIRDPARTYLICENSEREADME-JAVAFX.txt THIRDPARTYLICENSEREADME.txt Welcome.html
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
# 壓縮
tar zcvf jre8.tar.gz *
cp jre8.tar.gz ../
           

執行腳本（如果提示權限問題，需要執行chmod 755 -R clean-java.sh） 會在目前目錄生成最小化的java環境檔案壓縮包 jre8.tar.gz

3. 進入/opt/java目錄 建立Dockerfile檔案

#using alpine-glibc instead of alpine  is mainly because JDK relies on glibc
FROM docker.io/jeanblanchard/alpine-glibc

# author
MAINTAINER xxx<[email protected]>

# A streamlined jre
ADD jre8.tar.gz /usr/java/jdk/

# set env
ENV LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8
ENV JAVA_HOME /usr/java/jdk
ENV PATH ${PATH}:${JAVA_HOME}/bin

#設定時區 及 鏡像源
RUN echo "Asia/Shanghai" > /etc/timezone \ 
   && alpine_version=`cat /etc/issue | head -1 | awk '{print $5}'` \
   && echo "https://mirrors.aliyun.com/alpine/v${alpine_version}/main/" > /etc/apk/repositories \
   && apk upgrade && apk add --no-cache bash bash-doc bash-completion \
   && rm -rf /var/cache/apk/*
WORKDIR /opt/
           

4. 通過Dockerfile生成鏡像并上傳到倉庫

​ 注意: 需要在Dockerfile所在目錄下執行

# 打包鏡像
docker build -t 192.168.0.105:5000/java8-base:1.0 .
# 推送到鏡像倉庫
docker push 192.168.0.105:5000/java8-base:1.0
           

将192.168.0.105:5000替換成實際的鏡像倉庫位址和端口即可。

通過docker images 檢視鏡像

[[email protected] java]# docker images
REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE
192.168.0.105:5000/java8             1.0                 f40e68ca0d78        17 minutes ago      138MB
           

5. 運作鏡像并驗證

[[email protected] java]# docker run -it 192.168.0.105:5000/java8:1.0 bash
docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"bash\": executable file not found in $PATH": unknown.
[[email protected] java]# docker run -it 192.168.0.105:5000/java8:1.0 sh
/opt # ls
/opt # java -version
java version "1.8.0_281"
Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)
/opt # 
           

至此 java基礎鏡像建構并上傳到鏡像倉庫完成。