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Copy your public SSH key to a server

cautionSSHalle

Caution: This command changes the system. Understand what it does before you run it.

Adjust the values, the command updates live
user@server
ssh-copy-id -i ~/.ssh/id_ed25519_server.pub -p 22 webuser@server.example.com

Logs in to the server once with a password and appends the public key to the target user’s ~/.ssh/authorized_keys. Missing directories are created with the correct permissions. Keys that are already present are detected and not added twice.

Note: Afterwards, test the key login in a second session before disabling password authentication.

Also searched as

  • how to copy ssh key to server
  • ssh-copy-id custom port
  • set up passwordless ssh login

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All in SSH

Change or set the passphrase of an SSH key

$ssh-keygen -p -f ~/.ssh/id_ed25519_server
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Derive the public key from a private SSH key

$ssh-keygen -y -f ~/.ssh/id_ed25519_server
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Generate an Ed25519 SSH key pair

$ssh-keygen -t ed25519 -a 100 -C "admin@example.com" -f ~/.ssh/id_ed25519_server
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Show successful SSH logins from the journal

#journalctl -u ssh --since "7 days ago" --no-pager | grep 'Accepted'
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Start ssh-agent and load a key for a limited time

$eval "$(ssh-agent -s)" && ssh-add -t 4h ~/.ssh/id_ed25519_server
harmlessSSH

Generate a one-time login link for Plesk

#plesk login
harmlessPlesk

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
  • You run commands at your own risk. Liability for damages is excluded to the extent permitted by law.