copy_key_to_server.md

Copy the public key of the client to ~/.ssh/authorized_keys of the host

1. At host
   • First, edit /etc/ssh/sshd_config to turn on password login.

     sudo vim /etc/ssh/sshd_config
     

   • Find and comment these two lines

     PasswordAuthentication no
     PubkeyAuthentication yes
     

   • Restart ssh.

     sudo systemctl restart ssh
     

2. At client
   • Generate your private/public key pair.

     ssh-keygen
     

   • Copy client public key from client to host.

     ssh-copy-id <user>@<host IP>
     

   • Check if it works.

     ssh <user>@<host IP>
     

   • Remove passphrase [optional]

     ssh-keygen -p
     

3. At host
   • Edit /etc/ssh/sshd_config again.

     sudo vim /etc/ssh/sshd_config
     

   • Find and uncomment these two lines

     PasswordAuthentication no
     PubkeyAuthentication yes
     

   • Restart ssh.

     sudo systemctl restart ssh