update-dns-cloudflare.sh

#!/bin/sh

dnsserver=“your-dns-server.ns.cloudflare.com"
host="your-record-name"
domain_name=“yourdomain.com”
cf_user_email="[email protected]"
cf_api_key=“—get-your-own-api-key--“
cf_zone_id="—get-your-own-zone-id—“”
cf_record_id=“check-your-own-record-id”
dnsrecord=$host.$domain_name


# Get the current external IP address
current_ip=`curl -s -X GET https://checkip.amazonaws.com`
datestr=`date`

## NameChaep FreeDNS Dynamic Update URL
## keep these private
UPDATE_URL="https://api.cloudflare.com/client/v4/zones/$cf_zone_id/dns_records/$cf_record_id"

echo "[$datestr] Current IP is $current_ip"
dnsresult="[$datestr] `host $dnsrecord $dnsserver | grep 'has address'`"
if echo $dnsresult | grep "$current_ip"; then
  echo "[$datestr] $dnsrecord is currently set to $current_ip; no changes needed"
  exit 0
fi

#curl -X GET "https://api.cloudflare.com/client/v4/zones/41f2909777d668272873c17b3ae753c0/dns_records/" \
#     -H "X-Auth-Email: [email protected]" \
#     -H "X-Auth-Key: 9c3c329c9b2fadb40ffc3f2f2872efdd78633" \
#     -H "Content-Type: application/json" 

#curl -X PUT "https://api.cloudflare.com/client/v4/zones/41f2909777d668272873c17b3ae753c0/dns_records/372e67954025e0ba6aaa6d586b9e0b59" \
#     -H "X-Auth-Email: [email protected]" \
#     -H "X-Auth-Key: 9c3c329c9b2fadb40ffc3f2f2872efdd78633" \
#     -H "Content-Type: application/json" \
#     --data '{"type":"A","name":"h","content":"127.0.0.1","ttl":3600,"proxied":false}'

# if here, the dns record needs updating
result=`curl -s -X PUT $UPDATE_URL -H "X-Auth-Email: $cf_user_email" -H "X-Auth-Key: $cf_api_key" -H "Content-Type: application/json" --data "{\"type\": \"A\", \"name\":\"h\", \"content\":\"$current_ip\", \"ttl\":180, \"proxied\":false}"`
echo "[$datestr] Update Result: $result"
exit 0