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Check for Existing SSH Keys

You may already have an SSH key pair generated on your machine. To see whether you have SSH keys on the system, run the command:

ls -al ~/.ssh/id_*.pub

Generate SSH Key Pair

1. The first thing you need to do is generate an SSH key pair on the machine you are currently working on.

command is:

ssh-keygen -t rsa

Upload Public Key Using the ssh-copy-id or SFTP/SSH with Cat Command.

Option 1. Using the ssh-copy-id Command

Connect to the remote server and use the ssh-copy-id command, The public key is then automatically copied into the .ssh/authorized_keys file.

ssh-copy-id command:

ssh-copy-ide [remote_username]@[server_ip_address]

Option 2. Using The sftp with cat command :

sftp [remote_username]@[server_ip_address]
sftp> cd .ssh
sftp> put id_rsa.pub

Now login remote server :
cd .ssh
cat id_rsa.pub >> authorized_keys

Option 3. Using SSH with cat command :

cat .ssh/id_rsa.pub | ssh [email protected] ‘cat >> .ssh/authorized_keys