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As we already know in How to create your own key ssh by means of which we will only sign moles thanks to him for servers below guide on how to prepare the server to log only key.

I accept that we have already downloaded / save your public key and private so his move to add on a server.

Create a directory with the command key:

mkdir -p /root/.ssh

And we make editing:

nano /root/.ssh/authorized_keys

And paste: our public key:

#komputer w domu
ssh-rsa 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 rsa-key-20180607

#a computer at home is simply a description of the key to us was easier to manage them.

Now we go to the ssh server edition:

nano /etc/ssh/sshd_config

And change:

#AuthorizedKeysFile .ssh/authorized_keys 

na :

AuthorizedKeysFile .ssh/authorized_keys 

Another line is:

PasswordAuthentication yes

change the:

PasswordAuthentication no

Thanks to the login password will be disabled.

Ssh command to restart the service:

service ssh restart

be:

service sshd restart 

Depending on the system.

It's all in the case of putty in the Auth choose our private key.

When connecting to the server console after login administration should also give private key password.