Connect over SSH with a key

Safer and more convenient than a password.

1. Generate a modern key on your machine:

   ssh-keygen -t ed25519 -C "moi@mon-pc"

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2. Copy the public key to the server:

   ssh-copy-id utilisateur@serveur

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3. Connect:

   ssh utilisateur@serveur

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4. Add a shortcut in ~/.ssh/config:

   Host monserveur
     HostName 203.0.113.10
     User utilisateur
     IdentityFile ~/.ssh/id_ed25519

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5. Once the key is tested, disable passwords on the server (/etc/ssh/sshd_config) then restart the service:

   PasswordAuthentication no
   
   sudo systemctl restart ssh

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