Batch: Cloudflare APIv4 dynamic update A-record script. Created for a Synology NAS hosted Wordpress website.

cloudflare-api-synology.sh

# set shell variables with your contents
email="[email protected]"
authKey=""
zoneid=""
dnsrecord=""
domain="example.com"

# Collect current IP
current_ip=$(curl --silent --show-error --fail ipecho.net/plain) || exit

# ...and submit
  curl --silent --show-error --fail -X PUT "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records/$dnsrecord" \
  -H "X-Auth-Email: $email" \
  -H "X-Auth-Key: $authKey" \
  -H "Content-Type: application/json" \
  --data @- <<END;
{
    "id": "$zoneid",
    "type": "A",
    "name": "$domain",
    "content": "$current_ip",
    "zone_name": "$domain"
}

What this script does

This script will update your A-record on Cloudflare with your current public IP-address every time it runs. The script does not monitor for IP-address changes so you might want to schedule this script to run every minute/hour/day to prevent downtime when your IP-address changes. The CloudFlare API sets a maximum of 1,200 requests in a five minute period. You might want to use this script if your ISP is giving you a dynamic IP-address. If you're using a Synology NAS, you can use the build-in scheduler in DSM (6.0) to schedule this script.

The script is written in pure bash (.sh script) so no need for python/perl/bash 3rd party extensions or sudo rights.

Instructions

1. Insert your registered Cloudflare e-mail.
2. Insert your authkey. You can find your authkey by logging in to your personal Cloudflare account. The authkey is listed in your Cloudflare account settings.
3. Insert your Zone-ID. The Zone-ID is unique for every domain that you're using with Cloudflare. Use the following command on the terminal to retreive your zone-IDs.

curl -X GET https://api.cloudflare.com/client/v4/zones -H "X-Auth-Email:" -H "X-Auth-Key: xxxxxx" -H "Content-Type: application/json"

1. Insert your DNS record. Te DNS record can also be found when executing the above command.
2. Insert the domain you want to target with this script like example.com.