# GitLab CI/CD Deployment Guide

This document describes how to deploy the Orion platform to a **DigitalOcean Droplet** using **bare-metal systemd + Nginx**, with automated deployments from **GitLab CI/CD**.

---

## Prerequisites

- DigitalOcean Droplet (Ubuntu 22.04+ recommended)
- Domain name pointing to your server
- GitLab repository with CI/CD enabled
- SSH key pair for deployment

---

## 1. Server Folder Structure

The application will be deployed to:

```
/var/www/orion/
├── app/                    # FastAPI application
├── static/
│   ├── admin/
│   ├── store/
│   ├── shop/
│   └── shared/
├── templates/
├── alembic/                # Database migrations
├── .venv/                  # Python virtual environment
├── .env                    # Environment variables (created manually)
└── pyproject.toml
```

---

## 2. Server Setup

### Create Deploy User (Recommended)

```bash
sudo adduser deploy --disabled-password
sudo usermod -aG sudo deploy
sudo mkdir -p /var/www/orion
sudo chown -R deploy:deploy /var/www/orion
```

### Install System Dependencies

```bash
sudo apt update
sudo apt install -y python3.11 python3.11-venv python3-pip \
    build-essential libpq-dev nginx postgresql postgresql-contrib \
    nodejs npm certbot python3-certbot-nginx
```

### Install uv (Python Package Manager)

```bash
curl -LsSf https://astral.sh/uv/install.sh | sh
source ~/.bashrc
```

---

## 3. Database Setup (PostgreSQL)

```bash
# Create database and user
sudo -u postgres psql << EOF
CREATE USER orion WITH PASSWORD 'your_secure_password';
CREATE DATABASE orion OWNER orion;
GRANT ALL PRIVILEGES ON DATABASE orion TO orion;
EOF
```

---

## 4. systemd Service

Create `/etc/systemd/system/orion.service`:

```ini
[Unit]
Description=Orion FastAPI Application
After=network.target postgresql.service

[Service]
User=deploy
Group=deploy
WorkingDirectory=/var/www/orion
Environment="PATH=/var/www/orion/.venv/bin"
EnvironmentFile=/var/www/orion/.env
ExecStart=/var/www/orion/.venv/bin/uvicorn app.main:app --host 127.0.0.1 --port 8000 --workers 4
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target
```

Enable the service:

```bash
sudo systemctl daemon-reload
sudo systemctl enable orion
```

---

## 5. Nginx Configuration

Create `/etc/nginx/sites-available/orion`:

```nginx
server {
    listen 80;
    server_name yourdomain.com www.yourdomain.com;

    # Static files
    location /static/ {
        alias /var/www/orion/static/;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # Media/uploads
    location /uploads/ {
        alias /var/www/orion/uploads/;
        expires 7d;
    }

    # Proxy to FastAPI
    location / {
        proxy_pass http://127.0.0.1:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 300;
        proxy_connect_timeout 300;
    }
}
```

Enable the site:

```bash
sudo ln -s /etc/nginx/sites-available/orion /etc/nginx/sites-enabled/
sudo rm /etc/nginx/sites-enabled/default  # Remove default site
sudo nginx -t
sudo systemctl restart nginx
```

---

## 6. HTTPS with Let's Encrypt

```bash
sudo certbot --nginx -d yourdomain.com -d www.yourdomain.com
```

Certbot will automatically configure HTTPS and set up auto-renewal.

---

## 7. Firewall Configuration

```bash
sudo ufw allow OpenSSH
sudo ufw allow 'Nginx Full'
sudo ufw enable
```

---

## 8. GitLab CI/CD Pipeline

Create `.gitlab-ci.yml` in your project root:

```yaml
stages:
  - test
  - build
  - deploy

variables:
  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
  UV_CACHE_DIR: "$CI_PROJECT_DIR/.cache/uv"

# Test stage
test:
  stage: test
  image: python:3.11
  before_script:
    - pip install uv
    - uv venv
    - source .venv/bin/activate
    - uv pip install -r requirements.txt
  script:
    - python -m pytest tests/ -v --tb=short
  only:
    - merge_requests
    - main

# Build Tailwind CSS
build:
  stage: build
  image: node:20
  script:
    - npm install
    - npx tailwindcss -i ./static/src/input.css -o ./static/dist/output.css --minify
  artifacts:
    paths:
      - static/dist/
    expire_in: 1 week
  only:
    - main

# Deploy to production
deploy:
  stage: deploy
  image: alpine:latest
  before_script:
    - apk add --no-cache openssh-client rsync
    - mkdir -p ~/.ssh
    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' > ~/.ssh/id_ed25519
    - chmod 600 ~/.ssh/id_ed25519
    - ssh-keyscan -H $SERVER_HOST >> ~/.ssh/known_hosts
  script:
    # Sync files to server (excluding sensitive files)
    - rsync -avz --delete
        --exclude='.git'
        --exclude='.env'
        --exclude='*.pyc'
        --exclude='__pycache__'
        --exclude='.pytest_cache'
        --exclude='htmlcov'
        --exclude='*.db'
        ./ $SERVER_USER@$SERVER_HOST:$SERVER_PATH/

    # Install dependencies and run migrations
    - ssh $SERVER_USER@$SERVER_HOST "
        cd $SERVER_PATH &&
        ~/.cargo/bin/uv venv --python 3.11 &&
        source .venv/bin/activate &&
        ~/.cargo/bin/uv pip install -r requirements.txt &&
        python -m alembic upgrade head
      "

    # Restart the service
    - ssh $SERVER_USER@$SERVER_HOST "sudo systemctl restart orion"

    # Verify deployment
    - ssh $SERVER_USER@$SERVER_HOST "sudo systemctl status orion --no-pager"
  only:
    - main
  environment:
    name: production
    url: https://yourdomain.com
```

---

## 9. GitLab CI/CD Variables

Configure these in **Settings > CI/CD > Variables**:

| Variable | Description | Example |
|----------|-------------|---------|
| `SSH_PRIVATE_KEY` | Private key for server access | `-----BEGIN OPENSSH PRIVATE KEY-----...` |
| `SERVER_USER` | SSH user on server | `deploy` |
| `SERVER_HOST` | Server IP or hostname | `203.0.113.50` |
| `SERVER_PATH` | Application directory | `/var/www/orion` |

Mark `SSH_PRIVATE_KEY` as **Protected** and **Masked**.

---

## 10. Environment Variables

Create `/var/www/orion/.env` on the server:

```bash
# Application
APP_ENV=production
DEBUG=false
SECRET_KEY=your-super-secret-key-change-this

# Database
DATABASE_URL=postgresql://orion:password@localhost:5432/orion

# Stripe (if using billing)
STRIPE_SECRET_KEY=sk_live_...
STRIPE_WEBHOOK_SECRET=whsec_...

# Email
SMTP_HOST=smtp.your-provider.com
SMTP_PORT=587
SMTP_USER=your-email@domain.com
SMTP_PASSWORD=your-smtp-password
EMAILS_FROM=noreply@yourdomain.com

# Letzshop Integration (if applicable)
LETZSHOP_API_URL=https://api.letzshop.lu
```

Secure the file:

```bash
chmod 600 /var/www/orion/.env
```

---

## 11. Deployment Flow

1. Developer pushes to `main` branch
2. GitLab runs tests
3. GitLab builds Tailwind CSS
4. GitLab syncs files to server via rsync
5. Server installs/updates Python dependencies
6. Alembic runs database migrations
7. systemd restarts the FastAPI service
8. Nginx serves the application over HTTPS

---

## 12. Maintenance Commands

```bash
# View application logs
sudo journalctl -u orion -f

# Restart application
sudo systemctl restart orion

# Check application status
sudo systemctl status orion

# Run migrations manually
cd /var/www/orion
source .venv/bin/activate
python -m alembic upgrade head

# Rollback migration
python -m alembic downgrade -1
```

---

## 13. Security Recommendations

- [ ] Use a non-root deploy user (as shown above)
- [ ] Enable fail2ban for SSH protection
- [ ] Configure PostgreSQL to only allow local connections
- [ ] Set up automated backups for the database
- [ ] Enable log rotation
- [ ] Consider using Docker for isolation
- [ ] Set up monitoring (e.g., Prometheus + Grafana)
- [ ] Configure rate limiting in Nginx

---

## 14. Troubleshooting

### Application won't start

```bash
# Check logs
sudo journalctl -u orion -n 100

# Verify environment file
cat /var/www/orion/.env

# Test manually
cd /var/www/orion
source .venv/bin/activate
uvicorn app.main:app --host 127.0.0.1 --port 8000
```

### Database connection issues

```bash
# Test PostgreSQL connection
psql -U orion -h localhost -d orion

# Check PostgreSQL status
sudo systemctl status postgresql
```

### Nginx errors

```bash
# Test configuration
sudo nginx -t

# Check error logs
sudo tail -f /var/log/nginx/error.log
```