通过 SSH免密码登录远程Linux主机

主机1：172.16.222.88 [root@localhost ~]

主机2：172.16.198.23 root@kali64:~#

 [root@localhost ~]# ssh-keygen -t rsa   ===》在主机1上操作，生成密钥文件

Generating public/private rsa key pair.

Enter file in which to save the key(/root/.ssh/id_rsa):

/root/.ssh/id_rsa already exists.

Overwrite (y/n)? y ====è覆盖原来的文件，如果是第一次则不会出现这个

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:

35:8a:19:96:f5:1a:80:04:25:04:e0:66:48:fe:bc:[email protected]

The key's randomart p_w_picpath is:

+--[ RSA 2048]----+

|++++o.. .        |

|= ..  + .       |

|.=   + . +      |

|o o . + = .     |

|  o  o S        |

|  ..            |

| E o             |

| .              |

|                 |

+-----------------+

 [root@localhost ~]# 

scp /root/.ssh/id_rsa.pub  [email protected]:/root/.ssh/authorized_keys

=======》在主机1上操作，将生成的公钥上传到主机2上，并且重命名。

[email protected]'spassword:  ====》输入主机2的密码将公钥上传

id_rsa.pub                                                         

 100%  408     0.4KB/s  00:00   

[root@localhost ~]# ssh172.16.198.23  =====》在主机1上通过ssh登录主机2

Linux kali64 3.18.0-kali3-amd64#1 SMP Debian 3.18.6-1~kali2 (2015-03-02)x86_64

The programs included with the KaliGNU/Linux system are free software;

the exact distribution terms for eachprogram are described in the

individual files in /usr/share/doc/*/copyright.

Kali GNU/Linux comes with ABSOLUTELY NOWARRANTY, to the extent

permitted by applicable law.

Last login: Tue Jul 14 22:45:24 2015 from172.16.222.88