Hadoop中安装配置hadoop集群的将Hadoop配置进环境变量的操作步骤以及代码分别是什么？

1、获取hadoop安装路径

[victor@node1 ~]$ cd /opt/module/hadoop-2.8.2/
[victor@node1 hadoop-2.8.2]$ pwd
/opt/module/hadoop-2.8.2
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2、编辑 /etc/profile 文件

[victor@node1 ~]$ sudo vim /etc/profile

##JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_144
export PATH=$PATH:$JAVA_HOME/bin

##HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-2.8.2
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

:wq
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3、让修改后的文件生效

[victor@node1 ~]$ source /etc/profile
[victor@node1 ~]$ hadoop version
Hadoop 2.8.2
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r 
66c47f2a01ad9637879e95f80c41f798373828fb
Compiled by jdu on 2017-10-19T20:39Z
Compiled with protoc 2.5.0
From source with checksum dce55e5afe30c210816b39b631a53b1d
This command was run using /opt/module/hadoop-2.8.2/share/hadoop/common/hadoop-common-2.8.2.jar

## Java
export JAVA_HOME=/home/centos/soft/jdk
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin

## Hadoop
export HADOOP_USER_NAME=centos
export HADOOP_HOME=/home/centos/soft/hadoop
export CLASSPATH=$CLASSPATH:$HADOOP_HOME/lib
export PATH=$PATH:$HADOOP_HOME/bin