1.安装jdk
1 查询是否安装java软件:
rpm -qa|grep java
2 用工具将jdk导入到opt目录下面的software文件夹下面
3 解压jdk到/opt/module目录下
tar -zxf jdk-7u79-linux-x64.gz -C /opt/module/
4配置jdk环境变量
[root@hadoop02 ~]# vi /etc/profile
增加 export JAVA_HOME=/opt/module/java-1.7.0-openjdk-1.7.0.171-2.6.13.0.el7_4.x86_64
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
5 保存后退出:
:wq
6 source /etc/profile
7 [root@hadoop02 ~]# java -version
java version "1.7.0_171"
OpenJDK Runtime Environment (rhel-2.6.13.0.el7_4-x86_64 u171-b01)
OpenJDK 64-Bit Server VM (build 24.171-b01, mixed mode)
2.修改主机名称
1 [root@hadoop02 ~]# vi /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=hadoop02
2 [root@hadoop02 ~]# vi /etc/hosts
192.168.132.224 hadoop02
3 reboot 重启