How To Set Up SSH Keys on Debian/Ubuntu

How To Set Up SSH Keys on Debian/Ubuntu

ssh-keygen -t rsa

You will be prompted for a location to save the keys, and a passphrase for the keys. This passphrase will protect your private key while it’s stored on the hard drive and be required to use the keys every time you need to login to a key-based system:

Generating public/private rsa key pair.

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

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /home/b/.ssh/id_rsa.

Your public key has been saved in /home/b/.ssh/id_rsa.pub.

cp id_rsa.pub authorized_keys
chmod 700 ~/.ssh
chmod 600 authorized_keys

Then edit your /etc/ssh/sshd_config to:

AuthorizedKeysFile /etc/ssh/%u/authorized_keys

Finally, restart ssh with:

service ssh restart

On the host computer, ensure that the /etc/ssh/sshd_config contains the following lines, and that they are uncommented;

PubkeyAuthentication yes

RSAAuthentication yes

if disable the PasswordAuthentication,change

PasswordAuthentication yes

to

PasswordAuthentication no

How To Set Up SSH Keys on Debian/Ubuntu