Docker系列（四）-------------使用Dockerfile安装JDK8

墨蓝 2023-06-12 09:10 20阅读 0赞

# 一、简介 #

*  本文主要介绍docker如何安装jdk8并配置环境变量；
 *  本文采用dockerfile方式安装

# 二、安装步骤 #

## 2.1 下载jdk并上传服务器 ##

*  先去oracle官网【[https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html][https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]】下载jdk安装包；
 *  上传到服务器，此处我是上传到/usr/local/env/jdk8

[root@yuanshushu local]# mkdir /usr/local/env
    [root@yuanshushu local]# cd /usr/local/env/
    [root@yuanshushu env]# mkdir jdk8

*  上传服务器，如下

![20191111201656747.png][]

## 2.2 创建Dockerfile文件 ##

*  在jdk8目录下创建Dockerfile文件

[root@yuanshushu jdk8]# cd jdk8
    [root@yuanshushu jdk8]# touch Dockerfile

*  修改内容

# 基础镜像为 centos
    FROM centos
    # 维护者 
    MAINTAINER qjwyss
    # 添加jdk8压缩包至 /usr/local 目录，压缩包会自动解压，解压后目录名称为jdk1.8.0_231
    ADD jdk-8u231-linux-x64.tar.gz /usr/local/env/jdk8/
    # 配置JAVA_HOME环境变量
    ENV JAVA_HOME /usr/local/env/jdk8/jdk1.8.0_231/
    # 将JAVA_HOME/bin 添加至PATH环境变量
    ENV PATH $JAVA_HOME/bin:$PATH

*  根据Dockerfile文件构建镜像， 注意： .表明在当前目录，当前目录必须有Dockerfile文件和jdk-8u231-linux-x64.tar.gz文件

[root@yuanshushu jdk8]# docker build -t jdk8:v1.0 .
    Sending build context to Docker daemon  194.2MB
    Step 1/5 : FROM centos
    latest: Pulling from library/centos
    729ec3a6ada3: Pull complete
    Digest: sha256:f94c1d992c193b3dc09e297ffd54d8a4f1dc946c37cbeceb26d35ce1647f88d9
    Status: Downloaded newer image for centos:latest
     ---> 0f3e07c0138f
    Step 2/5 : MAINTAINER qjwyss
     ---> Running in bc5ec1edbf48
    Removing intermediate container bc5ec1edbf48
     ---> 9f98b79260d5
    Step 3/5 : ADD jdk-8u231-linux-x64.tar.gz /usr/local/env/jdk8/
     ---> de825756552c
    Step 4/5 : ENV JAVA_HOME /usr/local/env/jdk8/jdk1.8.0_231/
     ---> Running in b149975d72da
    Removing intermediate container b149975d72da
     ---> 92d10c79e192
    Step 5/5 : ENV PATH $JAVA_HOME/bin:$PATH
     ---> Running in 099bccbd52b2
    Removing intermediate container 099bccbd52b2
     ---> 4bbcc92dfa54
    Successfully built 4bbcc92dfa54
    Successfully tagged jdk8:v1.0

*  查看镜像

[root@yuanshushu jdk8]# docker images
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    jdk8                v1.0                4bbcc92dfa54        22 seconds ago      622MB
    centos              latest              0f3e07c0138f        5 weeks ago         220MB

*  后台运行镜像

[root@yuanshushu jdk8]# docker run -itd --name jdk8 jdk8:v1.0
    da7084eaf0e79bc2336980e5ebeecb912dcac3f83b5fbce9fdcb449664d32d8a

*  查看容器状态

[root@yuanshushu jdk8]# docker ps
    CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS               NAMES
    da7084eaf0e7        jdk8:v1.0           "/bin/bash"         About a minute ago   Up About a minute                       jdk8

*  进入容器，并查看jdk版本信息

[root@yuanshushu jdk8]# docker attach da7084eaf0e7
    [root@da7084eaf0e7 /]# java -version
    java version "1.8.0_231"
    Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
    Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
    [root@da7084eaf0e7 /]#

*  退出容器

[root@da7084eaf0e7 /]# exit
    exit
    [root@yuanshushu jdk8]

[https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
[20191111201656747.png]: https://img-blog.csdnimg.cn/20191111201656747.png