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@example.com"
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"
}