colmena/manual/src/features/keys.md
2022-02-16 10:23:27 -08:00

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# Secrets
Colmena allows you to upload secret files that will not be stored in the Nix store to nodes.
It implements a subset of the `deployment.keys` options supported by NixOps.
For example, to deploy DNS-01 credentials for use with `security.acme`:
```nix
{
shared-box = {
security.acme.certs."my-site.tld".credentialsFile = "/run/keys/acme-credentials.secret";
deployment.keys."acme-credentials.secret" = {
# Alternatively, `text` (string) or `keyFile` (path to file)
# may be specified.
keyCommand = [ "vault" "read" "-field=env" "secret/dns01" ];
destDir = "/run/keys"; # Default: /run/keys
user = "acme"; # Default: root
group = "nginx"; # Default: root
permissions = "0640"; # Default: 0600
uploadAt = "pre-activation"; # Default: pre-activation, Alternative: post-activation
};
# Rest of configuration...
};
}
```
Take note that if you use the default path (`/run/keys`), the secret files are only stored in-memory and will not survive reboots.
To upload your secrets without performing a full deployment, use `colmena upload-keys`.
## Key Services
For each secret file deployed using `deployment.keys`, a systemd service with the name of `${name}-key.service` is created (`acme-credentials.secret-key.service` for the example above).
This unit is only active when the corresponding file is present, allowing you to set up dependencies for services requiring secret files to function.