七、Dockerfile案例一（jdk1.8安裝）
阿新 • • 發佈：2018-11-20
案例一（建立jdk1.8的映象檔案）：
1 獲取一個簡單的Docker系統映象,並建立一個容器。
這裡我選擇下載CentOS映象
docker pull centos
通過docker tag命令將下載的CentOS映象名稱換成centos，並刪除老標籤的映象檔案。
docker tag docker.io/centos centos
docker rmi docker.io/centos
2. JDK的安裝和配置
去Oracle官網提前下載好所需的jdk。
建立資料夾，並將jdk copy到資料夾下。
[[email protected]~]# mkdir centos-jdk [[email protected] ~]# mv jdk-8u141-linux-x64.tar.gz ./centos-jdk/
[[email protected] ~]# cd centos-jdk/
[[email protected] centos-jdk]# ls
jdk-8u141-linux-x64.tar.gz
在centos-jdk資料夾中建立Dockerfile，其內容如下：
# CentOS with JDK 8 # Author dockerzlnewbie # build a newimage with basic centos FROM centos # who is the author MAINTAINER dockerzlnewbie # make a new directory to store the jdk files RUN mkdir /usr/local/java # copy the jdk archive to the image,and it will automaticlly unzip the tar file ADD jdk-8u141-linux-x64.tar.gz /usr/local/java/ # make a symbol link RUN ln-s /usr/local/java/jdk1.8.0_141 /usr/local/java/jdk # set environment variables ENV JAVA_HOME /usr/local/java/jdk ENV JRE_HOME ${JAVA_HOME}/jre ENV CLASSPATH .:${JAVA_HOME}/lib:${JRE_HOME}/lib ENV PATH ${JAVA_HOME}/bin:$PATH
根據Dokcerfile建立新映象：
# 注意後邊的 . 不能忘了
[[email protected] centos-jdk]# docker build -t="centos-jdk" .
Sending build context to Docker daemon 563.3 MB
Step 1/9 : FROM centos
---> 49f7960eb7e4
Step 2/9 : MAINTAINER dockerzlnewbie
---> Running in 236e645d059e
---> 46f1ec0e9185
Removing intermediate container 236e645d059e
Step 3/9 : RUN mkdir /usr/local/java
---> Running in 5bcabd89ff57
---> 850644b108f9
Removing intermediate container 5bcabd89ff57
Step 4/9 : ADD jdk-8u141-linux-x64.tar.gz /usr/local/java/
---> 6f93f8ae2f62
Removing intermediate container 763b95ac2d14
Step 5/9 : RUN ln -s /usr/local/java/jdk1.8.0_141 /usr/local/java/jdk
---> Running in 3fa23091d220
---> e65ff28dcd74
Removing intermediate container 3fa23091d220
Step 6/9 : ENV JAVA_HOME /usr/local/java/jdk
---> Running in 3377346d4bf3
---> e7ded6e2877b
Removing intermediate container 3377346d4bf3
Step 7/9 : ENV JRE_HOME ${JAVA_HOME}/jre
---> Running in e91d136905cf
---> 673c511de63e
Removing intermediate container e91d136905cf
Step 8/9 : ENV CLASSPATH .:${JAVA_HOME}/lib:${JRE_HOME}/lib
---> Running in 4b26957ba236
---> e0bc33b6a9e0
Removing intermediate container 4b26957ba236
Step 9/9 : ENV PATH ${JAVA_HOME}/bin:$PATH
---> Running in a70c96627f21
---> a2bc40b96e4a
Removing intermediate container a70c96627f21
Successfully built a2bc40b96e4a
[[email protected] centos-jdk]#
檢視新建立的映象
[[email protected] centos-jdk]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos-jdk latest ad1110b84433 5 minutes ago 503 MB centos latest e8f1bdb3b6a7 2 weeks ago 196.7 MB
建立容器，檢視新的映象中的JDK是否正確
[[email protected] centos-jdk]# docker run -it centos-jdk /bin/bash
[[email protected] /]# java -version # 出來結果表明配置沒問題
java version "1.8.0_141"
Java(TM) SE Runtime Environment (build 1.8.0_141-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.141-b15, mixed mode)
[[email protected] /]# echo $JAVA_HOME
/usr/local/java/jdk
[[email protected] /]#