SSH sem senha entre Servidores

Criando a chave rsa

[root@servidor01 .ssh]# ssh-keygen -t rsa

Generating public/private rsa key pair.

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

Apenas tecle enter duas vezes

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:

81:86:21:dd:ec:97:c2:27:d3:dd:16:7c:18:ca:cc:d5 root@servidor01.dominio.net

[root@servidor01 .ssh]# ls -l

total 12

-rw-------  1 root root  883 Nov 20 05:59 id_rsa

-rw-r--r--  1 root root  232 Nov 20 05:59 id_rsa.pub

-rw-r--r--  1 root root 3552 Oct 24 09:14 known_hosts

Copiar a chave pública para o servidor 2

[root@servidor01 .ssh]# scp id_rsa.pub servidor02.dominio.net:/root/.ssh/

root@servidor02.dominio.net's password:

id_rsa.pub                                  100%  232     0.2KB/s   00:00

[root@servidor01 .ssh]# ssh servidor02.dominio.net

root@servidor02.dominio.net's password:

Last login: Thu Nov 20 08:46:00 2008 from servidor01

[root@servidor02 ~]#

[root@servidor02 ~]# cd .ssh/

[root@servidor02 .ssh]# ls -la

total 24

drwx------  2 root root 4096 Nov 20 08:52 .

drwxr-x---  7 root root 4096 Nov 20 08:46 ..

-rw-r--r--  1 root root  232 Nov 20 08:52 id_rsa.pub

-rw-r--r--  1 root root 2022 Jun 13 14:42 known_hosts

Adicionando a chave pública ao arquivo authorized_keys

[root@servidor02 .ssh]# cat id_rsa.pub > authorized_keys

[root@servidor02 .ssh]#

[root@servidor02 .ssh]# logout

Connection to servidor02 closed.

Testando conexão ssh sem senha

[root@servidor01 .ssh]#

[root@servidor01 .ssh]# ssh servidor02

Last login: Thu Nov 20 08:53:11 2008 from servidor01

[root@servidor02 ~]#

[root@servidor02 ~]# logout

Pronto e sem mistério.

Agora podemos executar cópia de arquivos e executar comandos remotamente neste servidor sem o uso de senha.