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Configuring SSH

Setting a Default Username

If your username is different on your tilde than on your personal computer, you may want to specify a default username in ~/.ssh/config. That can be done by adding the following entries:

Host tilde.black
    User user

Using a Tilde-Specific key

Step 1: Generate Your Key

Generate a key, except outputting to a Tilde-specific location.

mkdir -p ~/.ssh/tilde.black
ssh-keygen -a100 -ted25519 -f ~/.ssh/tilde.black/id_ed25519 -C ''

Step 2: Authorize Your Key

If you have yet to sign up to your desired Tilde, send the public key (~/.ssh/tilde.black/id_ed25519.pub) to the admin.

If you already have an account, you can authorize your new key by adding it to, or replacing your old key in, ~/.ssh/authorized_keys.

$ scp ~/.ssh/tilde.black/id_ed25519.pub user@tilde.black:key.pub
$ ssh user@tilde.black
tilde$ cat key.pub >> .ssh/authorized_keys
tilde$ rm key.pub

Step 3: Configure SSH

To make ssh(1) only use that key for that tilde, you can add the following lines to ~/.ssh/config:

Host tilde.black
    IdentitiesOnly yes
    IdentityFile ~/.ssh/tilde.black/id_ed25519

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