Linux之间配置免秘钥访问

[root@localhost1 ~]# cat /etc/redhat-release 
CentOS release 6.5 (Final)
[root@localhost1 ~]# uname -a
Linux localhost1 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory ‘/root/.ssh‘.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
5e:5a:d4:7f:97:29:39:54:b9:1b:eb:13:12:4c:bc:2b root@localhost1
The key‘s randomart image is:
+--[ RSA 2048]----+
| . ..|
| . o.. |
| . +.. .|
| . .=.oo|
| S o ++o*|
| . + E oo=.|
| o . o .|
| o |
| .|
+-----------------+

[root@localhost1 ~]# cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
[root@localhost1 ~]# chmod 700 /root/.ssh/*

[root@localhost1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.8.20
The authenticity of host ‘192.168.8.20 (192.168.8.20)‘ can‘t be established.
RSA key fingerprint is 63:fe:c9:db:12:66:13:d0:23:e1:33:19:3d:cb:10:72.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘192.168.8.20‘ (RSA) to the list of known hosts.
root@192.168.8.20‘s password:

[root@localhost1 ~]# vim /etc/ssh/sshd_config
······
47 RSAAuthentication yes
48 PubkeyAuthentication yes