Configure SSH Login Without a Password

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SSH key-based login lets you connect to a remote server without typing the account password each time. It is also the preferred approach for automation, scripts and secure administration.

Create an SSH key

ssh-keygen -t ed25519

Use a passphrase unless the key is specifically for controlled automation.

Copy the public key to the server

ssh-copy-id user@server

Test the login

ssh user@server

Where the key is stored

~/.ssh/id_ed25519      # private key
~/.ssh/id_ed25519.pub  # public key

Keep the private key private. Copy only the .pub public key to remote systems.

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