SSH automático

No inicio criamos a chave publica para depois exporta-la com(deixar em branco e pressionar enter):

edwin@fenix:~$ ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/edwin/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/edwin/.ssh/id_dsa.
Your public key has been saved in /home/edwin/.ssh/id_dsa.pub.
The key fingerprint is:
79:94:33:87:44:cf:c5:70:22:2c:1f:45:d9:a8:85:4d edwin@fenix


Agora exportar a chave para a maquina que você quer logar sem senha:

ssh-copy-id -i ~/.ssh/id_dsa.pub usuario@servidor

Pronto