Intent
Keep hostnames accurate in dynamic network environments.
When to use
- Your public IP changes periodically.
- Services need stable hostnames.
- You run services from home or small offices.
Core mechanics
- Detect current public IP.
- Update DNS records via provider API.
- Verify DNS changes took effect.
Implementation checklist
- Store provider credentials securely.
- Schedule periodic IP checks.
- Update the DNS record when IP changes.
- Verify updates and log results.
- Alert on failures.
Failure modes and mitigations
- API outage -> retry with backoff.
- Wrong record updated -> scope credentials and validate host.
- Stale IP -> reduce check interval.
Observability and validation
- Last update time and current IP.
- Update success/failure logs.
Artifacts
- DDNS script.
- Provider configuration.