How to Set Up SSH Key Authentication for Passwordless Remote Server Access

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An operations engineer explains how to replace password logins with SSH key authentication, which the author says takes about five minutes using only the command line. The guide recommends generating an Ed25519 key pair with ssh-keygen, with a passphrase to encrypt the private key, and falling back to a 4096-bit RSA key for legacy systems. Public keys can be installed on a server with ssh-copy-id or by appending them to authorized_keys manually. The article also covers testing the new login, disabling password authentication in sshd_config, and troubleshooting common errors like permission problems and agent failures.

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