비밀번호 없이 ssh 접속하도록 설정

Step 1. ssh-keygen으로 로컬호스트에 키 생성

yklee@tyolee:~$ ssh-keygen

Generating public/private rsa key pair.

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

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /home/yklee/.ssh/id_rsa.

Your public key has been saved in /home/yklee/.ssh/id_rsa.pub.

The key fingerprint is:

f2:b2:ca:5f:12:a1:77:c3:be:5f:04:5c:a2:9c:24:54 yklee@tyolee

The key's randomart image is:

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

|     .o.E . .    |

|       + + o     |

|      . + o      |

|     . o   .     |

|    . + S   .    |

|     . * . .     |

|      o +   .    |

|   .   = . .     |

|    ooo ...      |

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

Step 2: ssh-copy-id로 public key 를 리모트 호스트로 카피

yklee@tyolee:~$ ssh-copy-id -i ~/.ssh/id_rsa.pub moderato.snu.ac.kr

yklee@moderato.snu.ac.kr's password:

Now try logging into the machine, with "ssh 'moderato.snu.ac.kr'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

yklee@tyolee:~$

 * ssh-copy-id 는 리모트 호스트의 .ssh/authorized_keys 에 키를 추가하게 된다.

Step 3. 리모트 호스트에 접속하면 패스워드를 묻지 않는다.

yklee@tyolee:~$ ssh moderato.snu.ac.kr

Linux moderato 2.6.24-24-server #1 SMP Sat Aug 22 01:40:42 UTC 2009 i686

The programs included with the Ubuntu system are free software;

the exact distribution terms for each program are described in the

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

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by

applicable law.

To access official Ubuntu documentation, please visit:

http://help.ubuntu.com/

Last login: Thu Mar  4 10:50:24 2010 from 112.216.249.82

[yklee@moderato ~] ll .ssh/

authorized_keys  known_hosts

[yklee@moderato ~] ll .ssh/authorized_keys

-rw------- 1 yklee 394 2010-03-04 11:02 .ssh/authorized_keys