centos容器yum安装JDK环境

1、yum命令安装jdk

选择版本安装

yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel

或者如下命令，安装jdk1.8.0的所有文件

yum install -y java-1.8.0-openjdk*
yum install -y java-1.8.0-openjdk.x86_64

2、查看JDK是否安装成功

# java -version

[root@1c164311bb8b /]# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

3、配置环境变量

JDK默认安装路径/usr/lib/jvm

[root@1c164311bb8b jvm]# pwd
/usr/lib/jvm
[root@1c164311bb8b jvm]#
[root@1c164311bb8b jvm]# ll
total 0
drwxr-xr-x. 3 root root 17 Jul 30 05:48 java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64
lrwxrwxrwx. 1 root root 21 Jul 30 05:48 jre -> /etc/alternatives/jre
lrwxrwxrwx. 1 root root 27 Jul 30 05:48 jre-1.8.0 -> /etc/alternatives/jre_1.8.0
lrwxrwxrwx. 1 root root 35 Jul 30 05:48 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk
lrwxrwxrwx. 1 root root 51 Jul 30 05:48 jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64 -> java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64/jre
lrwxrwxrwx. 1 root root 29 Jul 30 05:48 jre-openjdk -> /etc/alternatives/jre_openjdk
[root@1c164311bb8b jvm]#

在/etc/profile文件添加如下命令

# set java environment  
JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64
PATH=$PATH:$JAVA_HOME/bin  
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar  
export JAVA_HOME  CLASSPATH  PATH 

保存关闭profile文件，执行如下命令生效

source  /etc/profile

4、编写Dockerfile文件时，只需要定义容器变量即可（第三部可以省略）

ENV JAVA_HOME /usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64

参考博客：

DOCKER 安装CENTOS，TOMCAT，JDK等相关的自定义（DOCKERFILE）镜像

CentOS 7 yum 安装与配置 JDK

https://blog.csdn.net/github_38336924/article/details/82221258