hadoop配置

Hadoop安装

1. 三台linux AS 5.4操作系统的普通PC,名称分别为hadoop1,hadoop2,hadoop3。
   作用：  hadoop1 作为namenode   hadoop2、hadoop3 作为 datanode1、datanode2
   
2. 建立用户名   # useradd hadoop 
   建立安装目录 # mkdir hadoopinstall

3. 分别在三台机器上安装JDK 1.7
   在/etc/profile添加
   export JAVA_HOME=/home/hadoop/hadoopinstall/jdk1.7.0
   export JRE_HOME=/home/hadoop/hadoopinstall/jdk1.7.0/jre
   export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
   export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

   #source /etc/profile
 
4. HOSTS配置
   hadoop1:   vi /etc/hosts
              192.168.0.21  hadoop1  hadoop1
              192.168.0.22  hadoop2  hadoop2
              192.168.0.23  hadoop3  hadoop3
              
   hadoop2:   vi /etc/hosts
              192.168.0.21  hadoop1  hadoop1
              192.168.0.22  hadoop2  hadoop2
   
   hadoop3:   vi /etc/hosts
              192.168.0.21  hadoop1  hadoop1
              192.168.0.23  hadoop3  hadoop3