clanServices/sshd: add README

clanServices/sshd/README.md

@@ -0,0 +1,36 @@
+The `sshd` Clan service manages SSH to make it easy to securely access your machines over the internet. The service uses `vars` to store the SSH host keys for each machine to ensure they remain stable across deployments.
+
+`sshd` also generates SSH certificates for both servers and clients allowing for certificate-based authentication for SSH.
+
+The service also disables password-based authentication over SSH, to access your machines you'll need to use public key authentication or certificate-based authentication.
+
+## Usage
+
+```nix
+{
+  inventory.instances = {
+    # By default this service only generates ed25519 host keys
+    sshd-basic = {
+      module = {
+        name = "sshd";
+        input = "clan-core";
+      };
+      roles.server.tags.all = { };
+      roles.client.tags.all = { };
+    };
+
+    # Also generate RSA host keys for all servers
+    sshd-with-rsa = {
+      module = {
+        name = "sshd";
+        input = "clan-core";
+      };
+      roles.server.tags.all = { };
+      roles.server.settings = {
+        hostKeys.rsa.enable = true;
+      };
+      roles.client.tags.all = { };
+    };
+  };
+}
+```

clanServices/sshd/default.nix

@@ -2,7 +2,7 @@
 {
   _class = "clan.service";
   manifest.name = "clan-core/sshd";
-  manifest.description = "Enables secure remote access to the machine over ssh.";
+  manifest.description = "Enables secure remote access to the machine over SSH";
   manifest.categories = [
     "System"
     "Network"