🚀 DomainUp 1.0 – turn your Docker services into HTTPS domains in 1 minute, locally or in production.

# DomainUp

*Config-driven reverse proxy for Docker apps that ships production-ready **HTTPS** Nginx automation from a single **YAML**.*


[![PyPI](https://img.shields.io/pypi/v/domainup?color=3775A9&label=PyPI&logo=python)](https://pypi.org/project/domainup/)
[![Docker](https://img.shields.io/badge/docker-ready-2496ED?logo=docker&logoColor=white)](https://hub.docker.com/r/cirrondly/domainup)
[![License](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)
[![GitHub Stars](https://img.shields.io/github/stars/cirrondly/domainup?style=social)](https://github.com/cirrondly/domainup/stargazers)

## Table of Contents
- [Why DomainUp](#why-domainup)
- [Features](#features)
- [Quickstart](#quickstart)
- [Requirements](#requirements)
- [Installation](#installation)
- [Example: domainup.yaml → rendered Nginx](#example-domainupyaml-rendered-nginx)
- [Configuration](#configuration)
- [Configuration Options](#configuration-options)
- [Usage Examples](#usage-examples)
- [Files Generated](#files-generated)
- [DomainUp vs Hetzner DNS – Complementary Tools](#domainup-vs-hetzner-dns--complementary-tools)
- [How It Works](#how-it-works)
- [Roadmap](#roadmap)
- [Contributing](#contributing)
- [Security](#security)
- [Star & Support](#star-support)
- [License](#license)

## Why DomainUp

Every self-hosted DevOps sprint looked the same: log into a Hetzner box, wire up a reverse proxy, massage Nginx blocks, request Let’s Encrypt certs, and cross fingers that Docker endpoints still spoke **HTTPS**.

DomainUp turns that loop into a repeatable automation by reading one **YAML** map and emitting trusted templates for proxies and DNS orchestration.

- Save late-night pager time with https-ready domains launched in under a minute.
- Keep self-hosted Docker fleets tidy with versioned yaml and repeatable proxy steps.
- Give devops teammates confidence that Let’s Encrypt renewals, security headers, and monitoring hooks run on schedule.

## Features
- ⚡ Single **YAML** manifest defines every edge domain across Docker upstreams.
- 🔐 Built-in **HTTPS** termination with Let's Encrypt webroot renewals and optional HSTS.
- 🏠 **Local development certificates**: `domainup cert --local` auto-installs mkcert and generates trusted local certs (macOS/Linux/Windows).
- 🔁 Smart automation for DevOps teams with templated Nginx and Traefik renderers.
- 🧰 Self-hosted friendly: headers, websockets, basic auth, rate limits, sticky cookies, and path routing.
- 📦 Works with multiple Docker services, health checks, and per-domain overrides.
- 🔧 **Comprehensive diagnostics**: `diagnose` command checks DNS, ports, certificates, backend connectivity with actionable fixes.
- 🏥 **Framework-specific doctor**: Validates Django ALLOWED_HOSTS, FastAPI CORS, Express trust proxy, Flask ProxyFix.
- 🔌 **Auto-connect backends**: Automatically connects backend services to proxy network during `domainup up`.
- 🛡️ **Pre-flight cert checks**: Validates DNS, webroot, port 80 accessibility before Let's Encrypt issuance.
- 👤 **User management**: `add-user` command for easy htpasswd basic auth setup.
- 🔍 **Auto-discovery**: Detects running containers (even without published ports) and guides domain mapping.
- FinOps-friendly: **YAML**-as-source-of-truth, predictable **HTTPS** automation, reproducible across environments.

## Quickstart

⭐ If this project saves you time, please consider **starring** the repo — it helps more self-hosters find it.

Get up and running on a fresh self-hosted node with the CLI in minutes.

Install the CLI (see also [Installation](#installation)):

```bash
pipx install domainup    # or: pip install domainup
```

If you haven’t installed the CLI yet, see [Installation](#installation))

Run this minimal flow to validate the yaml stack, render Nginx, bring up the reverse proxy, and request Let’s Encrypt certs for https endpoints:

```bash
domainup init --email contact@cirrondly.com   # creates domainup.yaml skeleton
domainup plan                                 # validate + print plan
domainup render                               # generate Nginx configs from yaml
domainup up                                   # start Nginx gateway (auto-connects backends)
domainup cert                                 # obtain certs (webroot with pre-flight checks)
domainup cert --local                         # generate local dev certs with mkcert (auto-install)
domainup reload                               # reload Nginx
domainup deploy                               # render -> up -> cert -> reload
domainup diagnose                             # comprehensive diagnostics with fixes
domainup doctor --framework django            # framework-specific health checks
domainup add-user --domain api.example.com --username admin  # add htpasswd user
domainup check --domain api.example.com       # quick diagnostics (legacy)
```

This automation works equally well on local **Docker Compose** or remote hosts.

### Local Development with HTTPS

DomainUp makes local HTTPS development effortless with `mkcert` integration:

```bash
# 1. Initialize your config
domainup init --email dev@example.com

# 2. Add your local domains to /etc/hosts
echo "127.0.0.1 myapp.local api.local" | sudo tee -a /etc/hosts

# 3. Configure domains with TLS in domainup.yaml
# Set tls.enabled: true and tls.acme: false for local domains

# 4. Generate local certificates (auto-installs mkcert if needed)
domainup cert --local

# 5. Start your proxy
domainup render && domainup up && domainup reload
```

The `cert --local` command will:
- ✅ Detect your OS (macOS/Linux/Windows) and install mkcert if needed
- ✅ Install the root CA in your system trust store
- ✅ Generate certificates for all TLS-enabled domains
- ✅ Create wildcard certs (e.g., `*.myapp.local`)
- ✅ Save certs to `letsencrypt/live/<domain>/`

**Supported platforms:**
- macOS: `brew install mkcert`
- Ubuntu/Debian: `apt + wget`
- Fedora/RHEL/CentOS: `dnf + wget`
- Arch Linux: `pacman -S mkcert`
- Windows: `choco install mkcert`

After running `cert --local`, visit `https://myapp.local` in your browser — **no certificate warnings!**

### Port Configuration Tips

Local testing tips:
- If ports 80/443 are busy, either:
	- Override at runtime: `domainup up --http-port 8080 --https-port 8443` (no file edits), or
	- Make it permanent: set `runtime.http_port`/`runtime.https_port` in `domainup.yaml`, then `domainup up`.

## Example: domainup.yaml → rendered Nginx

Here’s the central **YAML** manifest that DomainUp consumes to manage multiple domains:

```yaml
version: 1
email: contact@cirrondly.com
engine: nginx   # nginx | traefik (poc)
cert:
	method: webroot   # webroot | dns01 (todo)
	webroot_dir: ./www/certbot
	staging: false    # true to test with LE staging
network: proxy_net
runtime:
	http_port: 80
	https_port: 443
domains:
	- host: api.example.com
		upstreams:
			- name: app1
				target: app:8000
				weight: 1
		paths:
			- path: /
				upstream: app1
				websocket: true
				strip_prefix: false
		headers:
			hsts: true
			extra:
				X-Frame-Options: DENY
				X-Content-Type-Options: nosniff
		security:
			basic_auth:
				enabled: false
				users: []
			allow_ips: []
			rate_limit:
				enabled: false
				requests_per_minute: 600
		tls: { enabled: true }
		gzip: true
		cors_passthrough: false

	- host: console.example.com
		upstreams:
			- name: console
				target: console:3000
		paths:
			- path: "/"
				upstream: console
		security:
			basic_auth:
				enabled: true
				users: ["admin:{SHA}..."]
		tls: { enabled: true }

	- host: data.example.com
		upstreams:
			- name: otel
				target: otel:4318
		paths:
			- path: "~* ^/(v1/|otlp/v1/)(traces|logs|metrics)"
				upstream: otel
				body_size: 20m
		tls: { enabled: true }
```

The renderer outputs an Nginx server block with upstreams and https wiring:

```nginx
server {
    listen 443 ssl;
    server_name api.example.com;

    ssl_certificate     /etc/letsencrypt/live/api.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.example.com/privkey.pem;

    include snippets/headers.conf;

    location / {
        proxy_pass http://app1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}
```

## Requirements
- Linux VM or local machine with **Docker** and **Docker Compose v2**
- Ports **80** and **443** available (for HTTP-01 / HTTPS)
- A writable directory for Let’s Encrypt assets (e.g. `./letsencrypt/`)

## Installation

**From PyPI**
```bash
# user-wide (pipx) – recommandé pour les CLIs
pipx install domainup

# ou via pip (virtualenv/venv)
pip install domainup
```

With Docker (no Python needed)

```bash
docker run --rm -it \
  -v $PWD:/work \
  -v $PWD/letsencrypt:/work/letsencrypt \
  -p 80:80 -p 443:443 \
  ghcr.io/cirrondly/domainup:latest domainup --help
```

## Configuration

DomainUp reads the `domainup.yaml` file for these options:

```yaml
version: 1
email: contact@cirrondly.com
engine: nginx   # Nginx | traefik (poc)
cert:
	method: webroot   # webroot | dns01 (todo)
	webroot_dir: ./www/certbot
	staging: false    # true to test with LE staging
network: proxy_net
runtime:
	http_port: 80
	https_port: 443
domains:
	- host: api.example.com
		upstreams:
			- name: app1
				target: app:8000
				weight: 1
		paths:
			- path: /
				upstream: app1
				websocket: true
				strip_prefix: false
		headers:
			hsts: true
			extra:
				X-Frame-Options: DENY
				X-Content-Type-Options: nosniff
		security:
			basic_auth:
				enabled: false
				users: []
			allow_ips: []
			rate_limit:
				enabled: false
				requests_per_minute: 600
		tls: { enabled: true }
		gzip: true
		cors_passthrough: false

	- host: console.example.com
		upstreams:
			- name: console
				target: console:3000
		paths:
			- path: "/"
				upstream: console
		security:
			basic_auth:
				enabled: true
				users: ["admin:{SHA}..."]
		tls: { enabled: true }

	- host: data.example.com
		upstreams:
			- name: otel
				target: otel:4318
		paths:
			- path: "~* ^/(v1/|otlp/v1/)(traces|logs|metrics)"
				upstream: otel
				body_size: 20m
		tls: { enabled: true }
```

## Configuration Options

| Option | Description | Default |
|--------|-------------|---------|
| `engine` | Selects the renderer (`Nginx` or `traefik`) for the edge gateway. | `Nginx` |
| `cert.method` | Chooses certificate strategy (`webroot` today, `dns01` planned) via Let's Encrypt. | `webroot` |
| `network` | Docker network name used to wire containers behind the gateway container. | `proxy_net` |
| `runtime.http_port` / `runtime.https_port` | Host ports exposed for http/https listeners. | `80` / `443` |
| `domains[].tls.enabled` | Enables HTTPS for this domain. | `false` |
| `domains[].tls.acme` | Use Let's Encrypt for certificates (set to `false` for local dev with mkcert). | `true` |
| `domains[].paths[].websocket` | Enables websocket upgrade support per route. | `false` |
| `domains[].security.basic_auth` | Configures htpasswd or inline users for protected paths. | `false` |
| `domains[].security.rate_limit` | Simple rate limiting (requests per minute) for DevOps safeguards. | `600` |

## Local Development Best Practices

### Complete Local Setup Guide

Here's a complete workflow for local development with HTTPS:

**1. Set up your local domains**
```bash
# Add domains to /etc/hosts
echo "127.0.0.1 myapp.local api.local admin.local" | sudo tee -a /etc/hosts
```

**2. Initialize DomainUp**
```bash
cd /path/to/your/project
domainup init --email dev@example.com --interactive
# Or discover running containers:
domainup discover
```

**3. Configure for local development**

Edit `domainup.yaml` to set `tls.acme: false` for local domains:

```yaml
domains:
  - host: myapp.local
    upstreams:
      - name: app
        target: app:8000
    tls:
      enabled: true
      acme: false  # Don't use Let's Encrypt locally
    paths:
      - path: /
        upstream: app
```

**4. Generate local certificates**
```bash
# This auto-installs mkcert if needed
domainup cert --local
```

**5. Start your stack**
```bash
domainup render
domainup up
domainup reload
```

**6. Test**
```bash
curl -I https://myapp.local
# Should return 200 with valid certificate
```

### Backend Configuration for Proxied Requests

When your backend app sits behind DomainUp's proxy, configure it to trust proxy headers:

**Django (`settings.py`):**
```python
USE_X_FORWARDED_HOST = True
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
ALLOWED_HOSTS = ['myapp.local', 'localhost']
CSRF_TRUSTED_ORIGINS = ['https://myapp.local']
```

**FastAPI:**
```python
from fastapi.middleware.trustedhost import TrustedHostMiddleware

app.add_middleware(
    TrustedHostMiddleware,
    allowed_hosts=["myapp.local", "localhost"]
)
```

**Express:**
```javascript
app.set('trust proxy', true);
```

**Flask:**
```python
from werkzeug.middleware.proxy_fix import ProxyFix
app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
```

Run `domainup doctor --framework <django|fastapi|express|flask>` to validate your backend configuration.

## Usage Examples

Generate configs for the running proxy stack:

```bash
domainup render && domainup up
```

Obtain certificates through Let’s Encrypt and reload the edge:

```bash
domainup cert && domainup reload
```

Check DNS and TLS quickly during automation runs:

```bash
domainup check --domain api.example.com
```

## Auto-discovery mode (zero-config)

`domainup up` can scan running Docker containers and guide you to map each service to a domain without touching YAML.

**🆕 Enhanced Discovery:** Now detects containers on the proxy network even without published ports!

```bash
domainup up   # discover → ask domains → write domainup.yaml → render+up+cert+reload

# Or run discovery alone:
domainup discover

# Typical guided flow
Found 4 containers:

[1] back_web_1      → 8000/tcp → 0.0.0.0:8000 (published)
[2] back_nginx      → 80/tcp (on proxy_net, internal)
[3] grafana         → 3000/tcp → 0.0.0.0:3000 (published)
[4] topic_llm            → 4318/tcp → 0.0.0.0:4318 (published)

Choose domain for back_web_1 (suggest: back_web_1.example.com): api.cirrondly.com
Enable websockets? [y/N]: y

Choose domain for back_nginx (suggest: back_nginx.example.com): app.cirrondly.com
Enable websockets? [y/N]: n

Choose domain for grafana (suggest: grafana.example.com): monitoring.cirrondly.com
Protect with Basic Auth? [y/N]: y

Choose domain for otel (suggest: otel.example.com): otlp.cirrondly.com
Large body (20m) for OTLP? [Y/n]: y
```

This will:

1. Detect containers with:
   - Published TCP ports (e.g., `0.0.0.0:8000→8000/tcp`)
   - OR containers on the proxy network with exposed ports (e.g., internal nginx on port 80)
2. Let you pick a FQDN per service (with smart defaults).
3. Automatically choose the right upstream format:
   - Published ports: `host.docker.internal:8000`
   - Network-only: `container-name:80` (Docker DNS)
4. Write/update domainup.yaml (idempotent).
5. Optionally start Nginx, issue certs, and reload.


Print DNS records for your provider (Hetzner, Cloudflare, Vercel) before you flip traffic:

```bash
domainup dns --ipv4 203.0.113.10 --ipv6 2001:db8::10
```

## Files Generated

### Nginx engine
- `nginx/nginx.conf`
- `nginx/conf.d/00-redirect.conf` (http→https + ACME webroot for all TLS hosts)
- `nginx/conf.d/<host>.conf` per domain
- `runtime/docker-compose.nginx.yml` to run the proxy

### Traefik engine
- `traefik/traefik.yml` (static)
- `traefik/dynamic/<host>.yml` per domain with middlewares
- `traefik/htpasswd/<host>.htpasswd` when basic auth enabled
- `runtime/docker-compose.traefik.yml` to run the proxy

## DomainUp vs Hetzner DNS – Complementary Tools

Developers sometimes ask: “If Hetzner DNS already exists, why would I need DomainUp?” Good question — they serve two different layers of the stack.

| Purpose | Hetzner DNS | DomainUp |
|---------|-------------|-----------|
| Manage DNS zones & records | ✅ Yes – creates A/AAAA/CNAME, etc. | ✅ Yes (via provider APIs, e.g. Hetzner, Cloudflare, Vercel) |
| Configure reverse proxy (Nginx / Traefik) | ❌ | ✅ Generates and reloads configs automatically |
| Obtain & renew Let's Encrypt certificates | ❌ | ✅ Full automation (HTTP-01 webroot today, DNS-01 soon) |
| Deploy and reload Dockerized edge | ❌ | ✅ domainup up, domainup reload, domainup deploy |
| Handle websockets, headers, auth, rate-limit, gzip | ❌ | ✅ Config-driven per domain |
| Provide a single CLI to set up new domains | ❌ | ✅ One-command automation |

### How they fit together
• Hetzner DNS is the authoritative DNS service that tells browsers “where to go”. It maps *.example.com → 91.98.141.137 (your server).

• DomainUp runs on that server and makes sure that, once traffic arrives, it’s routed to the right container, secured with HTTPS, and kept alive.

You can (and should) use both:

1. Keep Hetzner DNS as your DNS provider (fast, reliable, free API).
2. Use DomainUp to automate everything after DNS — proxy, certs, reloads.
3. Or let DomainUp call Hetzner’s API directly to create/update A/AAAA records automatically:

```bash
domainup dns --provider hetzner --token $HETZNER_DNS_TOKEN \
  --record monitoring A 91.98.141.137 \
  --record monitoring AAAA 2a01:4f8:1c1c:5d0e::1
```

### Override ports at runtime (no file edits)

If your machine already uses 80/443, you can override host ports just for this run:

```bash
domainup up --http-port 8080 --https-port 8443
```

You can still make it permanent by editing `domainup.yaml` under `runtime:` and re-running `domainup up`.

## Troubleshooting

### 🔍 New: Automated Diagnostics

DomainUp now includes comprehensive diagnostic tools to help identify and fix issues automatically:

```bash
# Run full diagnostics (checks all TLS domains)
domainup diagnose

# Check specific domain
domainup diagnose --domain api.example.com

# Framework-specific health checks
domainup doctor --framework django
domainup doctor --framework fastapi
domainup doctor --framework express
domainup doctor --framework flask
```

The `diagnose` command checks:
- ✅ Docker daemon status
- ✅ Proxy network existence and connectivity
- ✅ Nginx container health
- ✅ Host port availability (80/443)
- ✅ DNS resolution for all domains
- ✅ Certificate status and expiry
- ✅ ACME webroot accessibility
- ✅ Backend service connectivity

Each check provides **copy-paste fixes** for common issues.

### Ports 80/443 already in use

Symptoms:

```
Failed: ports 80/443 already in use on host.
```

Fix it in one of these ways:

- Quick (one-off):

```bash
domainup up --http-port 8080 --https-port 8443
```

- Permanent (edit config): in `domainup.yaml` set:

```yaml
runtime:
	http_port: 8080
	https_port: 8443
```

Then run:

```bash
domainup up
```

Or free the default ports by stopping whatever binds to 80/443 and try again.

### Docker daemon is not running

Symptoms:

```
Cannot connect to the Docker daemon ... Is the docker daemon running?
```

Start your Docker engine on macOS, then retry:

```bash
open -a Docker          # Docker Desktop
# or
colima start            # Colima
# or
open -a OrbStack        # OrbStack
```

The CLI detects this scenario and prints a helpful hint if Docker isn’t up.

### nginx: host not found in upstream

Symptoms in logs:

```
nginx: [emerg] host not found in upstream "back_web_1:8000" in /etc/nginx/conf.d/<host>.conf:2
```

What it means:
- Nginx tried to resolve the upstream host at startup and couldn't find it via Docker DNS.
- Common causes: the backend container isn't on the same Docker network as the proxy, or the target uses a container instance name instead of the Compose service name.

**🆕 Automatic Fix:**
Starting from v0.2, `domainup up` automatically connects backend services to the proxy network! If you still see this error:

1) Run diagnostics to identify the issue:

```bash
domainup diagnose --domain your-domain.com
```

2) Ensure the backend service joins the same network as DomainUp (default `proxy_net`). In your backend compose file:

```yaml
services:
	app:
		image: your/image
		networks: [proxy_net]

networks:
	proxy_net:
		external: true
```

3) Use the Compose service name, not a container instance name. For a service named `app` listening on 8000:

```yaml
upstreams:
	- name: app1
		target: app:8000
```

4) If the backend is running on the host (not in Docker), you can use `host.docker.internal:PORT` on macOS.

Verify connectivity:

```bash
docker network inspect proxy_net | jq '.[0].Containers | keys'
```

You should see both `nginx_proxy` and your backend service listed on `proxy_net`.

### Certificate Issuance Failed

**🆕 Enhanced Troubleshooting:**

The `domainup cert` command now includes:
- ✅ **Pre-flight checks**: Validates DNS, webroot, port 80 accessibility before attempting issuance
- ✅ **Smart error detection**: Identifies rate limits, DNS issues, firewall problems, timeouts
- ✅ **Copy-paste fixes**: Provides exact commands to resolve common issues

Common scenarios automatically detected:

**Rate limit hit:**
```
Let's Encrypt rate limit hit or policy violation
→ Fix: Set cert.staging: true in domainup.yaml and retry
→ Wait: 1 hour between attempts for the same domain
```

**Port 80 not accessible:**
```
ACME HTTP-01 validation failed
→ Fix: sudo ufw allow 80/tcp
→ Test: curl http://<domain>/.well-known/acme-challenge/test
→ Check: docker ps | grep nginx_proxy
```

**DNS not resolving:**
```
DNS does not resolve to this server
→ Fix: dig +short A <domain>
→ Ensure: A/AAAA records point to your server IP
→ Wait: Up to 24h for DNS propagation
```

Run `domainup diagnose` before `domainup cert` to catch issues early!

### 🔧 Typical setup

1. Create your DNS zone on Hetzner DNS or keep it on Vercel — both work.
2. Add A/AAAA records for each subdomain pointing to your Hetzner server.
3. On the server, run this chained deployment:

```bash
domainup render && domainup up && domainup cert && domainup reload
```

4. Optionally: `domainup dns hetzner --token …` to automate record creation next time.

## How It Works
- CLI parses the **YAML** spec and builds an in-memory model of domains, upstreams, and security rules.
- Template engine renders **Nginx** or **Traefik** configs, staging **Let’s Encrypt** assets where needed.
- **Docker Compose** files spin up the proxy containers with mounted certificates.
- Scheduled automation handles renewals, reloads, and optional DNS provider updates for DevOps teams.

## Roadmap

- DNS provider API integration: Vercel
- ACME DNS-01 support
- Certbot sidecar with 12h auto-renewal
- Named rate limits per domain
- Sticky session improvements

**✨ New in v1.0:**
- **🏠 Local HTTPS certificates**: `domainup cert --local` with automatic mkcert installation (macOS/Linux/Windows)
- **🔍 Enhanced discovery**: Detects containers on proxy network even without published ports
- **🔧 Smart 00-redirect handling**: Only generates HTTP→HTTPS redirect when TLS domains exist
- **Comprehensive diagnostics**: `domainup diagnose` checks DNS, ports, certs, backend connectivity
- **Framework doctor**: Health checks for Django, FastAPI, Express, Flask
- **Auto-connect backends**: Automatically connects services to proxy network
- **Pre-flight cert checks**: Validates setup before Let's Encrypt issuance
- **Improved proxy headers**: Added `X-Forwarded-Host`, `X-Forwarded-Port`, `proxy_redirect off`
- **Better error messages**: Actionable troubleshooting for common issues
- **User management**: `add-user` command for htpasswd basic auth
- **Auto-init on up**: Creates config via discovery if domainup.yaml missing

Delivered from roadmap in previous releases:
- Hetzner DNS automation (A/AAAA upsert) via `domainup dns --provider hetzner --token ...`
- Cloudflare DNS automation (A/AAAA upsert) via `domainup dns --provider cloudflare --token ...`
- Optional htpasswd file generation for basic auth (render-time)
- Better CORS passthrough controls
- Traefik middlewares: BasicAuth + CORS + RateLimit + Sticky cookie
- Traefik advanced headers: HSTS + custom response headers (from `headers.hsts` and `headers.extra`)

## Contributing

Set up the dev environment with editable dependencies and tests:

```bash
pip install -e .[dev]
pytest -q
```

Coding standards:
- Format: black, lint: ruff, types: mypy
- Tests: pytest; add unit tests for new behaviors
- PRs: include a brief description, motivation (what problem you solved), and tests

## Security

- Don’t expose Basic Auth user/passwords in the repo; use htpasswd files or safe secret storage.
- HTTP-01 requires port 80. If you can’t open it, prefer DNS-01 (on roadmap).
- Review Nginx config before going to production; adjust rate limits and headers as needed for your threat model.

## Star & Support

If DomainUp saves you time with proxy automation across Docker and Let’s Encrypt, ⭐ star the repo if it helped you! Share it with fellow self-hosted devops teams rolling out https services on yaml-first stacks.

## License

MIT License. See [LICENSE](LICENSE) for details.

Created with ❤️ by [Cirrondly](https://www.cirrondly.com) — a tiny startup by José MARIN.
