SSH Passwordless Login

SSH Secure Shell Protocol is a cryptographic protocol for secure data connection and remote command execution. By default, we need to type in our passwords everytime we wamt to login, but it is possible to set up a passwordless login.

1. Check if SSH is running.¶

We can check if the ssh is already running typing the following command in the Terminal

systemctl status ssh

In Fedora, we need to use,

systemctl status sshd

If the service is not running(i.e. active), run the following command to start the ssh service :

sudo systemtcl start sshd

2. Generate private and public keys¶

In our local machine, a key pair must be created with the command :

ssh-keygen

Press Enter three times until the command finishes. A public key file “~/.ssh/id_rsa.pub” and a private key file “~/.ssh/id_rsa” will be generated.

3. Copy the public key file to the remote machine¶

Now that we have generated an SSH key pair, in order to be able to login to our machine without a password we need to copy the public key to the server. Use the following command to do that,

ssh-copy-id remote_username@remote_server_ip_address

4. Login to your server.¶

Once above steps are done, we can login using the command ssh remote_username@remote_server_ip_address. Also it is possible to setup Custom SSH Connections to login easily.