Step1:关闭防火墙
  　　service iptables stop[status]
 　　 service iptables status
  　　chkconfig --list |grep iptables
  　　chkconfig iptables off
Step2:修改IP
 　　(重启网卡：service network restart)
Step3:修改hostname
 　　/etc/hosts
Step4:SSH免密码登陆
  　　产生密钥(~/.ssh中)ssh-keygen -t rsa
  　　cd ~/.ssh:cpid_rsa.pub authorized_keys
Step5:安装JDK
  　/usr/local中环境变量生效source /etc/profile

Step6:安装Hadoop

　　环境变量/ect/profile
Step7：Hadoop配置文件修改($Hadoop/conf/)
hadoop-env.sh:export JAVA_HOME=/usr/local/jdk
core-site.xml:
<configuration>
    <property>
            <name>fs.default.name</name>
            <value>hdfs://hadoop:9000</value>
    </property>
    <property>
            <name>fs.tmp.dir</name>
            <value>/usr/local/hadoop/tmp</value>
    </property>
</configuration>
hdfs-site.xml:
<configuration>
    <property>
            <name>dfs.replication</name>
            <value>1</value>
    </property>
    <property>
            <name>dfs.permission</name>
            <value>false</value>
    </property>
</configuration>
mapred-site.xml:
<configuration>
    <property>
            <name>mapred.job.tracker</name>
            <value>hadoop:9001</value>
    </property>
</configuration>