Simple bash script to keep Cloudflare A record up to date with your current global ip.
Useful for servers without a static ip.
You will need jq and curl to run the script.
On Debian/Ubuntu:
apt-get install -y curl jq
Put ddns somewhere (on your path if you want) and make it executable.
curl -o /path/to/ddns https://raw.githubusercontent.com/claudetech/cloudflare-ddns/master/ddns
chmod +x /path/to/ddns
Create a file with the EMAIL and TOKEN variables containing your Cloudflare email and API key. The default path is /etc/cloudflare/default but you can override it with the DNS_ENV variable.
You can also set the ZONE and DOMAIN variables for the A record you want to keep up to date, or pass the variables directly when executing the script.
You can find an example config in dns_env.example.
Do not forget to set the permission to 600 on the file, to avoid having your
Cloudflare API key read.
You can then run the script with:
DNS_ENV=/path/to/config ZONE=example.com DOMAIN=foo.example.com /path/to/ddns
You can omit ZONE and DOMAIN if you wrote them in the config file.
Note that it will not work if DOMAIN does not have an A record associated.
To keep your A record up to date, you can add the task to your crontab. After running crontab -e, add the following.
* * * * * DNS_ENV=/path/to/config /path/to/ddns 2>&1 >> /path/to/logfile
This will execute the script every minute.