This script automatically updates the A records for a list of FQDNs in AWS Route53 with the current public IP address of the machine running the script. It checks if the public IP has changed; if so, it uses the AWS CLI to update the A records for the specified subdomains. It also sends an email notification using an IFTTT webhook. The script is designed to be used in situations where a home server or device has a dynamic public IP that may change periodically, and the DNS records need to be updated accordingly to maintain accessibility.
AWS CLI installed and configured with the necessary permissions to update Route53 records.
Grant execute permissions with sudo chmod +x run_ddns.sh.
Copy the config.sh.example into a new config.sh file and configure the following:
- FQDNS: The list of DNS records to be monitored and updated to the servers public IP
- AWS_HOSTED_ZONE_ID: The Route53 hosted zone ID that contains the records you want to update
- IFTTT_KEY: Your IFTTT webhook key from https://ifttt.com/maker_webhooks
- IFTTT_EVENT: Your IFTTT event name, as specified when creating the webhook
Note: For more information check the IFTTT webhooks documentation. The IFTTT webhooks API endpoint looks like this
https://maker.ifttt.com/trigger/{IFTTT_EVENT}/json/with/key/{IFTTT_KEY}
- Run on-demand with
./run_ddns.sh - Check the logs with
tail -f log.csv - Schedule as a cronjob by adding a crontab command with
crontab -e
Example crontab command that runs every 5 minutes:
# m h dom mon dow command
*/5 * * * * cd /path/to/ddns && ./run_ddns.sh