Linux下SSH免密码登录

搭建Hadoop集群的时候一定会用到的就是SSH免密码登录

1.[Hadoop@hadoop1 ~]$ ssh-keygen -t rsa 
2.Generating public/private rsa key pair.  3.Enter file in which to save the key (/home/Hadoop/.ssh/id_rsa):  
4.Enter passphrase (empty for no passphrase):   5.Enter same passphrase again:  
6.Your identification has been saved in /home/Hadoop/.ssh/id_rsa. 
7.Your public key has been saved in /home/Hadoop/.ssh/id_rsa.pub.  8.The key fingerprint is: 
9.26:96:da:89:60:3d:90:75:43:bf:eb:56:d1:52:d9:68 Hadoop@hadoop1  10.The key's randomart image is: 
11.+--[ RSA 2048]----+  12.|    ..+      +   | 
13.|   o . o    E .  | 
14.|  o     .  +     | 
15.|   o   . .o .    | 
16.|  o o + S  o     | 
17.| . . * + ..      | 
18.|    o o ..       | 
19.|       ..        | 
20.|       ..        | 
21.+-----------------+ 
22.[Hadoop@hadoop1 ~]$ cd .ssh  23.[Hadoop@hadoop1 .ssh]$ scp -r id_rsa.pub hadoop@hadoop3:/home/hadoop/.ssh/authorized_keys  24.The authenticity of host 'Hadoop3 (192.168.127.120)' can't be established.  25.RSA key fingerprint is 03:be:af:08:19:27:6d:15:7e:dd:90:fa:09:b3:14:2f.  26.Are you sure you want to continue connecting (yes/no)? yes  27.Warning: Permanently added 'Hadoop3,192.168.127.120' (RSA) to the list of known hosts.  28.Hadoop@hadoop3's password:   29.id_rsa.pub                                                       100%  396     0.4KB/s   00:00      30.[Hadoop@hadoop1 .ssh]$ ssh hadoop3  31.Last login: Sat Aug  4 17:35:22 2012 from Hadoop1  如果不能没有成功

方法一：

1.[Hadoop@hadoop3 ~]$ chmod 700 .ssh/ 
2.[Hadoop@hadoop3 ~]$ cd .ssh 
3.[Hadoop@hadoop3 .ssh]$ chmod 600 authorized_keys  
方法二：

1.[root@Hadoop3 .ssh]# vi /etc/ssh/sshd_config  
2.AuthorizedKeysFile      .ssh/authorized_keys  把前面的#号去掉 
3.[root@Hadoop3 .ssh]# /etc/rc.d/init.d/sshd restart 
4.Stopping sshd:                                             [  OK  ] 
5.Starting sshd:                                             [  OK  ] 
 

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