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[root@host ~]$ ssh-keygen  <== Create a key pair
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): <== Press Enter
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): <== Enter a key passphrase, or press Enter to leave it empty
Enter same passphrase again: <== Enter the passphrase again
Your identification has been saved in /root/.ssh/id_rsa. <== Private key
Your public key has been saved in /root/.ssh/id_rsa.pub. <== Public key
The key fingerprint is:
0f:d3:e7:1a:1c:bd:5c:03:f1:19:f1:22:df:9b:cc:08 root@host

[root@host ~]$ cd .ssh
[root@host .ssh]$ cat id_rsa.pub >> authorized_keys

[root@host .ssh]$ chmod 600 authorized_keys
[root@host .ssh]$ chmod 700 ~/.ssh

RSAAuthentication yes
PubkeyAuthentication yes

PermitRootLogin yes

PasswordAuthentication no

[root@host .ssh]$ service sshd restart