dyndns-to-hetzner

DYNDNS to Hetzner

A DynDNS2 endpoint that changes DNS records using the Hetzner DNS API.

Running

Non-Docker

It is recommended to create a virtual environment for this project.

cd /opt # can be somewhere else if you prefer
python3 -m venv dyndns-to-hetzner
source dyndns-to-hetzner/bin/activate
pip install dyndns-to-hetzner
flask --app dyndns_to_hetzner init-config

The last command will print the location of the configuration file. Adjust it to your needs.

It is recommended to use a WSGI server to run this project, e.g. gunicorn:

pip install gunicorn
gunicorn -w 4 'dyndns_to_hetzner:create_app()' --access-logfile=- --bind="0.0.0.0:5000"

Setting up a reverse proxy such as nginx, apache or traefik is recommended if you want to access dyndns-to-hetzner from a different host.

Docker

There is no official image available via a repository, the provided docker-compose file builds the image when started.

You will need to clone the repository due to this.

git clone https://github.com/faeyben/dyndns-to-hetzner.git
cd dyndns-to-hetzner/docker
cp -a ../config.py.example config.py

Adjust the config.py to your liking.

docker-compose up -d

Setting up a reverse proxy such as nginx, apache or traefik is recommended if you want to access dyndns-to-hetzner from a different host.

Using

The update mechanism will be available at http://HOST_IP:5000/nic/update and expects the hostname and myip GET parameters, whereas hostname is the DNS record you want to update and myip is the IP you want the record to be set to.

Example: http://HOST_IP:5000/nic/update?hostname=home.example.com&myip=198.51.100.42

Access will only be granted after a successful HTTP Basic Authentication.

FRITZ!Box

FRITZ!Box routers allow setting up a DynDNS provider so the router sends an update to DynDNS anytime its public IP address changes. The following settings are required for that:

• Update-URL: http://HOST_IP:5000/nic/update?&myip=<ipaddr>&hostname=<domain> (replace HOST_IP with the IP address or hostname of the server that dyndns-to-hetzner is running on, use https instead of http if SSL/TLS is enabled via a reverse proxy on the host)
• Domainname: The FQDN of the record you want to have changed
• Username: A username you set in the config.py
• Password: The corresponding password you set in the config.py

After saving, the FRITZ!Box should issue a first update request within a few seconds.