# Server Setup Instructions / Server-Einrichtungsanleitung

---

# 🇬🇧 English Instructions

## 1. Prerequisites

Ensure you have the following tools installed on your local machine:
-   `nix` (with flakes enabled)
-   `sops`
-   `age`
-   `ssh`

## 2. DNS Configuration

Configure the following DNS records for your domain `cryodev.xyz`:

| Hostname | Type | Value | Purpose |
|----------|------|-------|---------|
| `@` | A | `<SERVER_IP>` | Main entry point |
| `@` | AAAA | `<SERVER_IPV6>` | Main entry point (IPv6) |
| `git` | CNAME | `@` | Forgejo |
| `headscale` | CNAME | `@` | Headscale |
| `headplane` | CNAME | `@` | Headplane |
| `netdata` | CNAME | `@` | Netdata Monitoring |
| `mail` | A | `<SERVER_IP>` | Mailserver |
| `mail` | AAAA | `<SERVER_IPV6>` | Mailserver (IPv6) |
| `@` | MX | `10 mail.cryodev.xyz.` | Mail delivery |
| `@` | TXT | `"v=spf1 mx ~all"` | SPF Record |
| `_dmarc` | TXT | `"v=DMARC1; p=none"` | DMARC Record |

## 3. Secret Management (SOPS)

This repository uses `sops-nix` to manage secrets encrypted with `age`, utilizing the SSH host keys of the servers.

### 3.1 Get Server Public Keys
You need to convert the servers' SSH host public keys to age public keys.

**For `cryodev-main`:**
```bash
nix-shell -p ssh-to-age --run 'ssh-keyscan -t ed25519 <MAIN_IP> | ssh-to-age'
```

**For `cryodev-pi`:**
```bash
nix-shell -p ssh-to-age --run 'ssh-keyscan -t ed25519 <PI_IP> | ssh-to-age'
```

### 3.2 Configure `.sops.yaml`
Edit the `.sops.yaml` file in the root of this repository. Add the age public keys to the `keys` section and ensure creation rules exist for both hosts.

```yaml
keys:
  - &admin_key age1e8p35795htf7twrejyugpzw0qja2v33awcw76y4gp6acnxnkzq0s935t4t # Admin Key (Steffen)
  - &main_key age1... # cryodev-main Key
  - &pi_key age1...   # cryodev-pi Key
creation_rules:
  - path_regex: hosts/cryodev-main/secrets.yaml$
    key_groups:
      - age:
        - *admin_key
        - *main_key
  - path_regex: hosts/cryodev-pi/secrets.yaml$
    key_groups:
      - age:
        - *admin_key
        - *pi_key
```

### 3.3 Generating Secret Values

**Mailserver Passwords (for `cryodev-main`):**
```bash
nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt'
```

**Headplane Secrets (for `cryodev-main`):**
```bash
nix-shell -p openssl --run "openssl rand -hex 16"
# Agent Pre-Authkey requires Headscale running:
sudo headscale users create headplane-agent
sudo headscale preauthkeys create --expiration 99y --reusable --user headplane-agent
```

**Tailscale Auth Keys (for both hosts):**
*Requires Headscale running on `cryodev-main`.*
```bash
# For cryodev-main:
sudo headscale preauthkeys create --expiration 99y --reusable --user default
# For cryodev-pi:
sudo headscale preauthkeys create --expiration 99y --reusable --user default
```

**Netdata Child UUID (for `cryodev-pi`):**
```bash
uuidgen
```

**Forgejo Runner Token:**
Get from Forgejo Admin Panel.

### 3.4 Creating Secrets Files

**`hosts/cryodev-main/secrets.yaml`:**
```bash
sops hosts/cryodev-main/secrets.yaml
```
```yaml
mailserver:
    accounts:
        forgejo: "$2y$05$..."
        admin: "$2y$05$..."

forgejo-runner:
    token: "..."

headplane:
    cookie_secret: "..."
    agent_pre_authkey: "..."

tailscale:
    auth-key: "..."
```

**`hosts/cryodev-pi/secrets.yaml`:**
```bash
sops hosts/cryodev-pi/secrets.yaml
```
```yaml
tailscale:
    auth-key: "..."

netdata:
    stream:
        child-uuid: "..." # Output from uuidgen
```

## 4. Initial Deployment (Bootstrap)

Before the continuous deployment can take over, you must perform an initial deployment manually using the provided install script.

### 4.1 Prepare Target Machine
1.  Boot into the NixOS Installation ISO.
2.  Set a root password (for SSH): `passwd`.
3.  Ensure internet connectivity.

### 4.2 Run Install Script
From your local machine (where this repo is), copy the script to the target or run it directly if you can fetch it.

**Method A: Copy Script via SSH**
```bash
scp scripts/install.sh nixos@<TARGET_IP>:install.sh
ssh nixos@<TARGET_IP>
sudo -i
chmod +x /home/nixos/install.sh
./home/nixos/install.sh -r <GIT_REPO_URL> -n <HOSTNAME>
```

**Method B: Run on Target (if repo is public or reachable)**
```bash
# On the target machine (as root)
nix-shell -p git
git clone <GIT_REPO_URL> /tmp/nixos
cd /tmp/nixos
bash scripts/install.sh -n <HOSTNAME>
```

*Note: The script handles disk partitioning (via disko/script), hardware config generation, and installation.*

## 5. Continuous Deployment (CD)

### 5.1 cryodev-pi (Pull-based via Comin)
The `cryodev-pi` host is configured to pull updates automatically via `comin`.

1.  **Create Repository:** Create a new repository named `cryodev-server` on your Forgejo instance (`https://git.cryodev.xyz`).
2.  **Push Configuration:** Push this entire NixOS configuration to the `main` branch of that repository.
3.  **Comin URL:** The configuration expects the repository at: `https://git.cryodev.xyz/steffen/cryodev-server.git`.

### 5.2 cryodev-main (Push-based via Forgejo Actions)
The main server is deployed via a Forgejo Action.

1.  **Generate SSH Key:**
    ```bash
    ssh-keygen -t ed25519 -f deploy_key -C "forgejo-actions"
    ```
2.  **Add Public Key:** Add the content of `deploy_key.pub` to `/root/.ssh/authorized_keys` on `cryodev-main`.
3.  **Add Secret:** Add the content of `deploy_key` (private key) as a secret named `DEPLOY_SSH_KEY` in your Forgejo repository settings.

## 6. Creating New Hosts (Templates)

To quickly bootstrap a new host configuration, you can use the provided templates.

1.  **Copy Template:**
    ```bash
    # For a Raspberry Pi:
    cp -r templates/raspberry-pi hosts/new-pi-name

    # For a generic x86 server:
    cp -r templates/generic-server hosts/new-server-name
    ```
2.  **Adjust Configuration:**
    *   **Hostname:** Edit `hosts/new-name/networking.nix`.
    *   **Flake:** Register the new host in `flake.nix` under `nixosConfigurations`.
    *   **Constants:** Add IP and ports to `constants.nix`.
    *   **Secrets:** Add keys to `.sops.yaml` and create `hosts/new-name/secrets.yaml`.

---

# 🇩🇪 Deutsche Anleitung

## 1. Voraussetzungen

Stellen Sie sicher, dass folgende Tools lokal installiert sind:
-   `nix` (mit Flakes)
-   `sops`
-   `age`
-   `ssh`
-   `ssh-to-age`
-   `uuidgen`

## 2. DNS-Konfiguration

Richten Sie folgende DNS-Einträge für `cryodev.xyz` ein:

| Hostname | Typ | Wert | Zweck |
|----------|-----|------|-------|
| `@` | A | `<SERVER_IP>` | Hauptserver |
| `@` | AAAA | `<SERVER_IPV6>` | Hauptserver (IPv6) |
| `git` | CNAME | `@` | Forgejo |
| `headscale` | CNAME | `@` | Headscale |
| `headplane` | CNAME | `@` | Headplane |
| `netdata` | CNAME | `@` | Netdata Monitoring |
| `mail` | A | `<SERVER_IP>` | Mailserver |
| `mail` | AAAA | `<SERVER_IPV6>` | Mailserver (IPv6) |
| `@` | MX | `10 mail.cryodev.xyz.` | Mail-Empfang |
| `@` | TXT | `"v=spf1 mx ~all"` | SPF-Record |
| `_dmarc` | TXT | `"v=DMARC1; p=none"` | DMARC-Record |

## 3. Verwaltung von Geheimnissen (SOPS)

Dieses Repository nutzt `sops-nix` mit den SSH-Host-Keys der Server.

### 3.1 Public Keys abrufen

**Für `cryodev-main`:**
```bash
nix-shell -p ssh-to-age --run 'ssh-keyscan -t ed25519 <MAIN_IP> | ssh-to-age'
```

**Für `cryodev-pi`:**
```bash
nix-shell -p ssh-to-age --run 'ssh-keyscan -t ed25519 <PI_IP> | ssh-to-age'
```

### 3.2 `.sops.yaml` konfigurieren
Bearbeiten Sie `.sops.yaml` und fügen Sie die Keys sowie Regeln für beide Hosts hinzu:

```yaml
keys:
  - &admin_key age1e8p35795htf7twrejyugpzw0qja2v33awcw76y4gp6acnxnkzq0s935t4t # Admin Key (Steffen)
  - &main_key age1... # cryodev-main Key
  - &pi_key age1...   # cryodev-pi Key
creation_rules:
  - path_regex: hosts/cryodev-main/secrets.yaml$
    key_groups:
      - age:
        - *admin_key
        - *main_key
  - path_regex: hosts/cryodev-pi/secrets.yaml$
    key_groups:
      - age:
        - *admin_key
        - *pi_key
```

### 3.3 Werte generieren

**Mailserver:** `mkpasswd -sm bcrypt`
**Headplane:** `openssl rand -hex 16`
**Netdata UUID:** `uuidgen`

**Tailscale Auth Keys (auf `cryodev-main`):**
```bash
sudo headscale preauthkeys create --expiration 99y --reusable --user default
```

### 3.4 Secrets-Dateien erstellen

**`hosts/cryodev-main/secrets.yaml`:**
```bash
sops hosts/cryodev-main/secrets.yaml
```
```yaml
mailserver:
    accounts:
        forgejo: "$2y$05$..."
        admin: "$2y$05$..."

forgejo-runner:
    token: "..."

headplane:
    cookie_secret: "..."
    agent_pre_authkey: "..."

tailscale:
    auth-key: "..."
```

**`hosts/cryodev-pi/secrets.yaml`:**
```bash
sops hosts/cryodev-pi/secrets.yaml
```
```yaml
tailscale:
    auth-key: "..."

netdata:
    stream:
        child-uuid: "..." # Output von uuidgen
```

## 4. Erstes Deployment (Bootstrap)

Bevor das automatische Deployment funktionieren kann, müssen Sie das System einmal manuell mit dem Installationsskript installieren.

### 4.1 Zielmaschine vorbereiten
1.  Booten Sie das NixOS Installations-ISO.
2.  Setzen Sie ein Root-Passwort: `passwd`.
3.  Stellen Sie eine Internetverbindung her.

### 4.2 Install-Script ausführen
Kopieren Sie das Skript von Ihrem lokalen Rechner auf das Zielsystem.

**Methode A: Per SCP**
```bash
scp scripts/install.sh nixos@<TARGET_IP>:install.sh
ssh nixos@<TARGET_IP>
sudo -i
chmod +x /home/nixos/install.sh
./home/nixos/install.sh -r <GIT_REPO_URL> -n <HOSTNAME>
```

**Methode B: Direkt auf dem Ziel (bei öffentlichem/erreichbarem Repo)**
```bash
# Auf der Zielmaschine (als root)
nix-shell -p git
git clone <GIT_REPO_URL> /tmp/nixos
cd /tmp/nixos
bash scripts/install.sh -n <HOSTNAME>
```

*Hinweis: Das Skript kümmert sich um Partitionierung, Hardware-Config und Installation.*

## 5. Continuous Deployment (CD)

### 5.1 cryodev-pi (Pull-basiert via Comin)
Der Host `cryodev-pi` zieht Updates automatisch via `comin`.

1.  **Repository erstellen:** Erstellen Sie ein Repository namens `cryodev-server` auf `https://git.cryodev.xyz`.
2.  **Konfiguration pushen:** Pushen Sie diese Konfiguration in den `main`-Branch.
3.  **Comin URL:** `https://git.cryodev.xyz/steffen/cryodev-server.git`.

### 5.2 cryodev-main (Push-basiert via Forgejo Actions)
Der Hauptserver wird über eine Forgejo Action deployt.

1.  **SSH Key generieren:**
    ```bash
    ssh-keygen -t ed25519 -f deploy_key -C "forgejo-actions"
    ```
2.  **Public Key hinzufügen:** Inhalt von `deploy_key.pub` in `/root/.ssh/authorized_keys` auf `cryodev-main` eintragen.
3.  **Secret hinzufügen:** Inhalt von `deploy_key` (Private Key) als Secret `DEPLOY_SSH_KEY` im Forgejo-Repository hinterlegen.

## 6. Neue Hosts erstellen (Templates)

Um schnell eine neue Host-Konfiguration zu erstellen, können Sie die bereitgestellten Templates nutzen.

1.  **Template kopieren:**
    ```bash
    # Für einen Raspberry Pi:
    cp -r templates/raspberry-pi hosts/neuer-pi-name

    # Für einen generischen x86 Server:
    cp -r templates/generic-server hosts/neuer-server-name
    ```
2.  **Konfiguration anpassen:**
    *   **Hostname:** Bearbeiten Sie `hosts/neuer-name/networking.nix`.
    *   **Flake:** Registrieren Sie den neuen Host in `flake.nix` unter `nixosConfigurations`.
    *   **Constants:** Fügen Sie IP und Ports in `constants.nix` hinzu.
    *   **Secrets:** Fügen Sie Keys zu `.sops.yaml` hinzu und erstellen Sie `hosts/neuer-name/secrets.yaml`.