ubuntu ssh key only
# To disable tunneled clear text passwords, change to no here!
sudo nano /etc/ssh/sshd_config
PasswordAuthentication no
PubkeyAuthentication yes
RSAAuthentication yes
```
-----------------------------------------------
```
And restart sshd
sudo service ssh restart
# Permission denied (publickey)
Chances are, your /home/<user>
or ~/.ssh/authorized_keys permissions are too open by OpenSSH standards.
You can get rid of this problem by issuing the following commands:
chmod go-w ~/
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys