安裝JDK環境

1.安裝JDK

- 解壓到指定目錄

[root@node1 opt]# ls
jdk-8u211-linux-x64.tar.gz   redis-4.0.1
[root@node1 opt]# tar -zxvf jdk-8u211-linux-x64.tar.gz -C /usr/local/
[root@node1 opt]# cd /usr/local/
[root@node1 local]# ls
bin  etc  games  include  jdk1.8.0_211  lib  lib64  libexec  sbin  share  src

- 配置環境變量

[root@node1 local]# vim /etc/profile
JAVA_HOME=/usr/local/jdk1.8.0_211
CLASSPATH=.:$JAVA_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH
export PATH JAVA_HOME CLASSPAT

- 使配置文件生效

[root@node1 local]# source /etc/profile

- 查看版本

[root@node1 local]# java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)