Tutorial

The system you want to deploy secrets to should already exist and have sshd running on it so that it has generated SSH host keys in /etc/ssh/.
Make a directory to store secrets and secrets.nix file for listing secrets and their public keys (This file is not imported into your NixOS configuration. It is only used for the agenix CLI.):
```
$ mkdir secrets
$ cd secrets
$ touch secrets.nix
```

Add public keys to secrets.nix file (hint: use ssh-keyscan or GitHub (for example, https://github.com/ryantm.keys)):

let
  user1 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL0idNvgGiucWgup/mP78zyC23uFjYq0evcWdjGQUaBH";
  user2 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILI6jSq53F/3hEmSs+oq9L4TwOo1PrDMAgcA1uo1CCV/";
  users = [ user1 user2 ];

  system1 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPJDyIr/FSz1cJdcoW69R+NrWzwGK/+3gJpqD1t8L2zE";
  system2 = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKzxQgondgEYcLpcPdJLrTdNgZ2gznOHCAxMdaceTUT1";
  systems = [ system1 system2 ];
in
{
  "secret1.age".publicKeys = [ user1 system1 ];
  "secret2.age".publicKeys = users ++ systems;
  "armored-secret.age" = {
    publicKeys = [ user1 ];
    armor = true;
  };
}

Edit secret files (these instructions assume your SSH private key is in ~/.ssh/):
```
$ agenix -e secret1.age
```

Add secret to a NixOS module config:

{
  age.secrets.secret1.file = ../secrets/secret1.age;
}

Use the secret in your config:

{
  users.users.user1 = {
    isNormalUser = true;
    passwordFile = config.age.secrets.secret1.path;
  };
}

NixOS rebuild or use your deployment tool like usual.

The secret will be decrypted to the value of config.age.secrets.secret1.path (/run/agenix/secret1 by default).

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