Digital Ocean Dynamic DNS Updater

• Resolves your public IPv4 and updates the A‑record only when it changes.
• 60‑second TTL for near‑instant propagation.
• Uses the local DNS resolver first and calls the DigitalOcean API only when necessary.
• Lightweight: pure Python 3, systemd‑managed, no root privileges while running.
• One‑step install / uninstall via make.

sudo apt update
sudo apt install -y python3 make git python3-requests python3-yaml python3-dnspython

# 1. Fetch the code
git clone https://github.com/liger1978/doddns.git
cd doddns

# 2. Install system‑wide (prompts for sudo)
make install

This creates:

• /usr/local/bin/doddns – executable daemon
• /etc/doddns.yaml – configuration template (root‑only, owned by the doddns user)
• /etc/systemd/system/doddns.service – service unit
• System user & group doddns

The service starts immediately. Tail the journal with:

journalctl -u doddns -f

Edit /etc/doddns.yaml (root privileges required):

name: home.example.com        # FQDN managed by DigitalOcean DNS
token: dop_v1_XXXX...         # Personal access token
interval_minutes: 5           # Polling interval (optional, default 5)

After changes:

sudo systemctl restart doddns

Remove everything that the installer added:

cd doddns   # repo directory
make uninstall

• Runs under a dedicated system user with no shell and no home directory (/nonexistent).
• Only the token file (/etc/doddns.yaml) is readable by that user.
• If you need persistent state or cache files, change the user's home to something like /var/lib/doddns and grant write permission only there.

Happy low‑latency DNS updates! 🚀