一、安装JDK
二、设置SSH免密码登陆：
ssh-keygen -t rsa 之后一路回 车（产生秘钥）,位于~/.ssh文件夹中
cd ~
cd .ssh
cp id_rsa.pub authorized_keys
验证：ssh localhost
[root@localhost .ssh]# ssh localhost
The authenticity of host 'localhost (127.0.0.1)' can't be established.
RSA key fingerprint is ec:73:0d:e8:60:7c:43:e7:cd:f8:c6:05:cd:96:71:53.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (RSA) to the list of known hosts.
Last login: Mon Aug 4 09:18:39 2014 from 192.168.230.1
[root@localhost ~]#
如果不行：service sshd restart重启SSH
三、修改hostname
1.关闭sendmail服务，不然修改完hostname重启系统会一直卡住
(1).service sendmail stop (或 /etc/rc.d/init.d/sendmail stop) 停止服务
(2)chkconfig --list sendmail (可以查看到sendmail在2，3，4，5时是自动启动的，而一般的系统设置为3， 因此每次启动时sendmail还是会自动启动。)
(3)系统启动时不启动sendmail：chkconfig --level 2345 sendmail off 关闭其端口,这样就关闭了这个服务。
2.修改物理地址:
(1).service network restart 会提示：
Shutting down interface eth0: Device eth0 has MAC address 00:0C:29:39:63:E2,
instead of configured address 00:0C:29:FC:3A:09. Ignoring.
(2).vi /etc/sysconfig/network-scripts/ifcfg-eth0
HWADDR=00:0C:29:39:63:E2
保存退出再 service network restart 一切正常
3.修改hostname
(1).vi /etc/sysconfig/network
HOSTNAME=hadoop0
(2).vi /etc/hosts
192.168.230.132 hadoop0
(3).重启网络：service network restart
4.系统重启 reboot
启动后输入hostname 就会显示 hadoop0了
四、关闭防火墙
service iptables stop;
chkconfig iptables off;