ddns

DynamicDNS/config

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+## WARNING: set deamon at least to 600 seconds if you use checkip or you could
+## get banned from their service.
+daemon=600  # check every 600 seconds (10mins)
+ssl=yes     # use ssl-support
+use=web     # acquire current IP address via web URL
+
+# Override IP address provider since SSL=yes currently breaks
+# the default (non-SSL) provider in my version of ddclient.
+# GitHub issue: https://github.com/ddclient/ddclient/issues/597
+web=checkip.dyndns.org/
+web-skip='Current IP Address:' # Probably not needed but doesn't hurt
+
+##
+## Cloudflare
+protocol=cloudflare,        \
+zone=example.com,            \
+ttl=1,                      \
+login=email,    \
+password=YOUR_API_TOKEN    \
+example.com,sub1.example.com,sub2.example.com,sub3.example.com

DynamicDNS/docker-compose.yaml

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+---
+services:
+  ddclient:
+    image: lscr.io/linuxserver/ddclient:latest
+    container_name: ddclient
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=Etc/UTC
+    volumes:
+      - /home/ubuntu/docker/ddns/config:/config
+    restart: unless-stopped

DynamicDNS/script.sh

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+#!/bin/bash
+
+# Cloudflare API details
+ZONE_ID="your_zone_id"
+RECORD_ID="your_record_id"
+API_TOKEN="your_cloudflare_api_token"
+RECORD_NAME="your_domain.com"
+
+# Get the current external IP
+CURRENT_IP=$(curl -s http://ipv4.icanhazip.com/)
+
+# Get the IP stored in Cloudflare
+CLOUDFLARE_IP=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
+-H "Authorization: Bearer $API_TOKEN" \
+-H "Content-Type: application/json" | jq -r '.result.content')
+
+# Compare the IPs
+if [ "$CURRENT_IP" != "$CLOUDFLARE_IP" ]; then
+  echo "IP has changed from $CLOUDFLARE_IP to $CURRENT_IP. Updating DNS record..."
+
+  # Update the Cloudflare DNS record
+  UPDATE_RESPONSE=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
+  -H "Authorization: Bearer $API_TOKEN" \
+  -H "Content-Type: application/json" \
+  --data '{"type":"A","name":"'"$RECORD_NAME"'","content":"'"$CURRENT_IP"'","ttl":120,"proxied":false}')
+
+  # Check if the update was successful
+  if echo "$UPDATE_RESPONSE" | jq -r '.success' | grep -q true; then
+    echo "DNS record updated successfully."
+  else
+    echo "Failed to update DNS record. Response from Cloudflare: $UPDATE_RESPONSE"
+  fi
+else
+  echo "IP has not changed. No update needed."
+fi