update_record.sh

#!/bin/sh

# MY_DOMAIN="ms.exlent.io"
# CLOUDFLARE_RECORD_ID="123"
# CLOUDFLARE_ZONE_ID=""
# CLOUDFLARE_EMAIL=""
# CLOUDFLARE_GLOBAL_API_KEY=""

# Use 208.67.222.222 instead of resolver1.opendns.com to prevent nslookup goes with ipv6
NEW_IP=`nslookup myip.opendns.com 208.67.222.222 | awk '/Address/ { print $2 }' | tail -1`
CURRENT_IP=`nslookup $MY_DOMAIN | awk '/Address/ { print $2 }' | tail -1`

if [ "$NEW_IP" = "$CURRENT_IP" ]
then
        echo "No Change in IP Adddress"
else
curl -X PUT "https://api.cloudflare.com/client/v4/zones/$CLOUDFLARE_ZONE_ID/dns_records/$CLOUDFLARE_RECORD_ID" \
     -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
     -H "X-Auth-Key: $CLOUDFLARE_GLOBAL_API_KEY" \
     -H "Content-Type: application/json" \
     --data '{"type":"A","name":"'$MY_DOMAIN'","content":"'$NEW_IP'","ttl":120,"proxied":false}'
echo $NEW_IP >> /tmp/ip_history.txt
fi