执行命令ssh-keygen -P ''

询问保存路径直接回车默认即可，

后面提示私钥保存为/root/.ssh/id_rsa

公钥保存为/root/.ssh/id_rsa.pub

[root@node1 ~]# ssh-keygen -P ''

Generating public/private rsa key pair.

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

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:

dc:62:ba:81:ac:dd:d9:93:fa:b4:9b:21:8d:e7:98:8c root@node1.magedu.com

The key's randomart p_w_picpath is:

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

|                 |

|                 |

|                 |

|       . .       |

|        S .      |

|   . . = .       |

|    o = =.       |

|   o + %o+       |

|  . E OoBo       |

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

ssh-copy-id -i .ssh/id_rsa.pub root@172.16.58.3

[root@node1 ~]# ssh-copy-id -i .ssh/id_rsa.pubroot@172.16.58.3

The authenticity of host '172.16.58.3 (172.16.58.3)' can'tbe established.

RSA key fingerprint isdb:f8:11:fa:7d:30:95:44:1b:eb:ea:89:ee:fa:a1:27.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '172.16.58.3' (RSA) to the listof known hosts.

root@172.16.58.3's password:

Now try logging into the machine, with "ssh'root@172.16.58.3'", and check in:

  .ssh/authorized_keys

Wed Dec 31 16:51:41 CST 2014