DDNS Cloudflare

crontab

# Run script every hours
0 * * * * /ddns.sh

ddns.sh

#!/bin/bash

CF_EMAIL="your cf email"
CF_TOKEN="your cf token"
CF_ZONE_ID="your cf zone id"

# array of subdomains to update
declare -a subDomains=(
  "record_1_id sub1.example.com"
  "record_2_id sub2.example.com"
)

updateIP() {
  printf "Update sub domain $1 with $IP\n"
  curl -X PATCH https://api.cloudflare.com/client/v4/zones/$CF_ZONE_ID/dns_records/$1 \
    -H 'Content-Type: application/json' \
    -H 'X-Auth-Email: '$CF_EMAIL'' \
    -H 'Authorization: Bearer '$CF_TOKEN'' \
    --data '{
      "type": "A",
      "content": "'$IP'",
      "name": "'$2'",
      "proxied": true,
      "ttl": 1
    }'
    printf "\n"
}

IP=$(curl https://api.ipify.org)
echo "Server IP: $IP"

for i in "${subDomains[@]}"
do
  readarray -d " " -t strarr <<< "$i"
  updateIP ${strarr[0]} ${strarr[1]}
done

echo "Finished"