JDK和SSH已经安装配置完成，可以开始部署Hadoop了。
再次使用WinSCP，将hadoop-0.20.2.tar.gz传送到服务器上；然后使用scp指令传送到其它节点上。
[hadoop@n1 software]$ gunzip hadoop-0.20.2.tar.gz
[hadoop@n1 software]$ tar -xvf hadoop-0.20.2.tar
。。。。。
[hadoop@n1 software]$ mv hadoop-0.20.2 /home/hadoop/.
[hadoop@n1 ~]$ scp /software/hadoop-0.20.2.tar hadoop@192.168.10.102:/home/hadoop/.
hadoop-0.20.2.tar 100% 129MB 6.2MB/s 00:21
[hadoop@n1 ~]$ scp /software/hadoop-0.20.2.tar hadoop@192.168.10.103:/home/hadoop/.
hadoop-0.20.2.tar 100% 129MB 5.6MB/s 00:23
现在3个节点上的hadoop解压完成，下面分别进行如下配置。
1）conf/Hadoop-env.sh文件的修改，设置Java_HOME。
# The java implementation to use. Required.
export JAVA_HOME=/software/jdk1.6.0_33
2）修改conf/core-site.xml
[hadoop@n1 conf]$ mkdir -p /software/hdata
<property>
<name>fs.default.name</name>
<value>hdfs://n1:9000</value>
</property>
3）修改conf/hdfs-site.xml
<property>
<name>dfs.data.dir</name>
<value>/software/hdata</value>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
4）修改conf/mapred-site.xml
<property>
<name>mapred.job.tracker</name>
<value>n1:9001</value>
</property>
5）修改conf/masters
n1
6）修改conf/slaves
d1
d2
7）将conf目录及修改的文件复制到其它两个节点的相应目录中
[hadoop@n1 conf]$ scp *.* d1:/home/hadoop/hadoop-0.20.2/conf/.
[hadoop@n1 conf]$ scp *.* d2:/home/hadoop/hadoop-0.20.2/conf/.
8）格式化hdfs
[hadoop@n1 hadoop-0.20.2]$ bin/hadoop namenode -format
12/10/09 04:12:40 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = n1/192.168.10.101
。。。。。。
12/10/09 04:12:41 INFO common.Storage: Storage directory /tmp/hadoop-hadoop/dfs/name has beensuccessfully formatted.
12/10/09 04:12:41 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at n1/192.168.10.101
************************************************************/
9）启动hadoop
[hadoop@n1 hadoop-0.20.2]$ bin/start-all.sh
starting namenode, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-namenode-n1.out
d1: starting datanode, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-d1.out
d2: starting datanode, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-d2.out
n1: starting secondarynamenode, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-secondarynamenode-n1.out
starting jobtracker, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-jobtracker-n1.out
d2: starting tasktracker, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-tasktracker-d2.out
d1: starting tasktracker, logging to /home/hadoop/hadoop-0.20.2/bin/../logs/hadoop-hadoop-tasktracker-d1.out
[hadoop@n1 hadoop-0.20.2]$
启动成功，没有报错。