LInux安装jdk

下载地址：Java Downloads | Oracle

查看原装jdk
[root@slave1 java]# rpm -qa | grep jdk
java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64
卸载原装jdk
[root@master java]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64
[root@master java]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
[root@master java]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
[root@master java]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64

在usr文件夹下创建java文件夹
cd /usr/java
导入jdk，解压
tar -zxvf jdk-8u131-linux-x64.tar.gz
转移
mv jdk1.8.0_131/ jdk

安装jdk和Hadoop，配置环境变量：vi /etc/profile
JAVA_HOME=/usr/java/jdk
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

让修改生效：

source /etc/profile