【Hadoop大数据分析与挖掘实战】（二）----------P22~23

接【Hadoop大数据分析与挖掘实战】（一）

5.配置ssh免登录

　　1）启动三台机器，分别修改机器名为master、slave一、slave2，重启系统。

[root@localhost ~]$ vim /etc/sysconfig/network #修改内容以下 NETWORKING = yes NETWORKING_IPV6 = no HOSTNAME = master #HOSTNAME为主机名，分别改一下就好。

　　2）修改master上的/etc/hosts。

#添加内容以下
192.168.222.131 master
192.168.222.132 slave1
192.168.222.133 slave2

　　3）将hosts文件复制到slave1和slave2。

[root@master ~]# scp /etc/hosts root@slave1:/etc
[root@master ~]# scp /etc/hosts root@slave2:/etc

　　4）在master机器上使用hadoop用户登陆（确保接下来的操做都是经过hadoop用户执行）。执行￥ssh-keygen -t rsa命令产生公钥。

[hadoop@master ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /tmp/id_rsa.
Your public key has been saved in /tmp/id_rsa.pub.
The key fingerprint is:
fa:2c:f7:98:9f:13:a1:7d:86:04:4c:54:5b:76:3e:01 hadoop@master
The key's randomart image is:
+--[ RSA 2048]----+
|       +o.. E.o  |
|        o  + o . |
|         ..   o  |
|          o    . |
|        S+ o     |
|       .. + o    |
|      .    +     |
|      .o.o..     |
|       o=o+.     |
+-----------------+

　　5）将公钥复制到slave1和slave2.

[hadoop@master tmp]$ ssh-copy-id -i ~/.ssh/id_rsa.pub slave1
#输入hadoop@slave1的密码
[hadoop@master tmp]$ ssh-copy-id -i ~/.ssh/id_rsa.pub slave2
#输入hadoop@slave2的密码

　　6）再次登陆，已经能够不须要密码能够登陆slave1，slave2.

[hadoop@master tmp]$ ssh slave1
Last login: Mon Jan 23 14:37:40 2017 from 192.168.0.112
[hadoop@slave1 ~]$ 

 

再后面是第六项安装Hadoop，配置文件我再研究研究。