🚀 Cloudflare DDNS

Access your home network remotely via a custom domain name without a static IP!

⚡ Efficiency

• ❤️ Easy config. List your domains and you're done.
• 🔁 The Python runtime will re-use existing HTTP connections.
• 🗃️ Cloudflare API responses are cached to reduce API usage.
• 🤏 The Docker image is small and efficient.
• 0️⃣ Zero dependencies.
• 💪 Supports all platforms.
• 🏠 Enables low cost self hosting to promote a more decentralized internet.
• 🔒 Zero-log IP provider (cdn-cgi/trace)
• 👐 GPL-3.0 License. Open source for open audits.

💯 Complete Support of Domain Names, Subdomains, IPv4 & IPv6, and Load Balancing

• 🌐 Supports multiple domains (zones) on the same IP.
• 📠 Supports multiple subdomains on the same IP.
• 📡 IPv4 and IPv6 support.
• 🌍 Supports all Cloudflare regions.
• ⚖️ Supports Cloudflare Load Balancing.
• 🇺🇸 Made in the U.S.A.

📊 Stats

Size	Downloads	Discord

🚦 Getting Started

First copy the example configuration file into the real one.

cp config-example.json config.json

Edit config.json and replace the values with your own.

🔑 Authentication methods

You can choose to use either the newer API tokens, or the traditional API keys

To generate a new API tokens, go to your Cloudflare Profile and create a token capable of Edit DNS. Then replace the value in

"authentication":
  "api_token": "Your cloudflare API token, including the capability of **Edit DNS**"

Alternatively, you can use the traditional API keys by setting appropriate values for:

"authentication":
  "api_key":
    "api_key": "Your cloudflare API Key",
    "account_email": "The email address you use to sign in to cloudflare",

📍 Enable or disable IPv4 or IPv6

Some ISP provided modems only allow port forwarding over IPv4 or IPv6. In this case, you would want to disable any interface not accessible via port forward.

"a": true,
"aaaa": true

🎛️ Other values explained

"zone_id": "The ID of the zone that will get the records. From your dashboard click into the zone. Under the overview tab, scroll down and the zone ID is listed in the right rail",
"subdomains": "Array of subdomains you want to update the A & where applicable, AAAA records. IMPORTANT! Only write subdomain name. Do not include the base domain name. (e.g. foo or an empty string to update the base domain)",
"proxied": "Defaults to false. Make it true if you want CDN/SSL benefits from cloudflare. This usually disables SSH)",
"ttl": "Defaults to 300 seconds. Longer TTLs speed up DNS lookups by increasing the chance of cached results, but a longer TTL also means that updates to your records take longer to go into effect. You can choose a TTL between 30 seconds and 1 day. For more information, see [Cloudflare's TTL documentation](https://developers.cloudflare.com/dns/manage-dns-records/reference/ttl/)",

📠 Hosting multiple subdomains on the same IP?

This script can be used to update multiple subdomains on the same IP address.

For example, if you have a domain example.com and you want to host additional subdomains at foo.example.com and bar.example.com on the same IP address, you can use this script to update the DNS records for all subdomains.

⚠️ Note

Please remove the comments after // in the below example. They are only there to explain the config.

Do not include the base domain name in your subdomains config. Do not use the FQDN.

👉 Example 🚀

{
  "cloudflare": [
    {
      "authentication": {
        "api_token": "api_token_here",  // Either api_token or api_key
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "zones": [
        {
          "zone_id": "your_zone_id_here", // Zone ID for example.com
          "subdomains": [
            {
              "name": "", // Root domain (example.com)
              "proxied": false
            },
            {
              "name": "foo", // (foo.example.com)
              "proxied": true
            },
            {
              "name": "bar", // (bar.example.com)
              "proxied": true
            }
          ]
        }
    }
  ],
  "a": true,
  "aaaa": true,
  "purgeUnknownRecords": false,
  "ttl": 300
}

🌐 Hosting multiple domains (zones) on the same IP?

You can handle ddns for multiple domains (cloudflare zones) using the same docker container by duplicating your configs inside the cloudflare: [] key within config.json like below:

⚠️ Note:

If you are using API Tokens, make sure the token used supports editing your zone ID.

{
  "cloudflare": [
    {
      "authentication": {
        "api_token": "api_token_here",
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "zones": [
        {
          "zone_id": "your_zone_id_1_here",
          "subdomains": [
            {
              "name": "",
              "proxied": false
            },
            {
              "name": "remove_or_replace_with_your_subdomain",
              "proxied": false
            }
          ]
        },
        {
          "zone_id": "your_zone_id_2_here",
          "subdomains": [
            {
              "name": "subdomain1",
              "proxied": true
            },
            {
              "name": "subdomain2",
              "proxied": false
            }
          ]
        }
      ]
    },
    {
      "authentication": {
        "api_token": "api_token_here",
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "zones": [
        {
          "zone_id": "your_zone_id_1_here",
          "subdomains": [
            {
              "name": "",
              "proxied": false
            },
            {
              "name": "remove_or_replace_with_your_subdomain",
              "proxied": false
            }
          ]
        },
        {
          "zone_id": "your_zone_id_2_here",
          "subdomains": [
            {
              "name": "subdomain1",
              "proxied": true
            },
            {
              "name": "subdomain2",
              "proxied": false
            }
          ]
        }
      ]
    }
  ],
  "a": true,
  "aaaa": true,
  "purgeUnknownRecords": false
}

⚖️ Load Balancing

If you have multiple IP addresses and want to load balance between them, you can use the loadBalancing option. This will create a CNAME record for each subdomain that points to the subdomain with the lowest IP address.

📜 Example config to support load balancing

{
  "cloudflare": [
    {
      "authentication": {
        "api_token": "api_token_here",
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "zones": [
        {
          "zone_id": "your_zone_id_1_here",
          "subdomains": [
            {
              "name": "",
              "proxied": false
            },
            {
              "name": "remove_or_replace_with_your_subdomain",
              "proxied": false
            }
          ]
        },
        {
          "zone_id": "your_zone_id_2_here",
          "subdomains": [
            {
              "name": "subdomain1",
              "proxied": true
            },
            {
              "name": "subdomain2",
              "proxied": false
            }
          ]
        }
      ]
    }
  ],
  "cloudflare": [
    {
      "authentication": {
        "api_token": "api_token_here",
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "zones": [
        {
          "zone_id": "your_zone_id_1_here",
          "subdomains": [
            {
              "name": "",
              "proxied": false
            },
            {
              "name": "remove_or_replace_with_your_subdomain",
              "proxied": false
            }
          ]
        },
        {
          "zone_id": "your_zone_id_2_here",
          "subdomains": [
            {
              "name": "subdomain1",
              "proxied": true
            },
            {
              "name": "subdomain2",
              "proxied": false
            }
          ]
        }
      ]
    }
  ],
  "load_balancer": [
    {
      "authentication": {
        "api_token": "api_token_here",
        "api_key": {
          "api_key": "api_key_here",
          "account_email": "your_email_here"
        }
      },
      "pool_id": "your_pool_id_here",
      "origin": "your_origin_name_here"
    }
  ],
  "a": true,
  "aaaa": true,
  "purgeUnknownRecords": false,
  "ttl": 300
}

🧹 Optional features

purgeUnknownRecords removes stale DNS records from Cloudflare. This is useful if you have a dynamic DNS record that you no longer want to use. If you have a dynamic DNS record that you no longer want to use, you can set purgeUnknownRecords to true and the script will remove the stale DNS record from Cloudflare.

🐳 Deploy with Docker Compose

Pre-compiled images are available via the official docker container on DockerHub.

Modify the host file path of config.json inside the volumes section of docker-compose.yml.

version: '3.9'
services:
  cloudflare-ddns:
    image: timothyjmiller/cloudflare-ddns:latest
    container_name: cloudflare-ddns
    security_opt:
      - no-new-privileges:true
    network_mode: 'host'
    environment:
      - PUID=1000
      - PGID=1000
    volumes:
      - /YOUR/PATH/HERE/config.json:/config.json
    restart: unless-stopped

⚠️ IPv6

Docker requires network_mode be set to host in order to access the IPv6 public address.

🏃‍♂️ Running

From the project root directory

docker-compose up -d

🐋 Kubernetes

Create config File

cp ../../config-example.json config.json

Edit config.jsonon (vim, nvim, nano... )

${EDITOR} config.json

Create config file as Secret.

kubectl create secret generic config-cloudflare-ddns --from-file=config.json --dry-run=client -oyaml -n ddns > config-cloudflare-ddns-Secret.yaml

apply this secret

kubectl apply -f config-cloudflare-ddns-Secret.yaml
rm config.json # recomended Just keep de secret on Kubernetes Cluster

apply this Deployment

kubectl apply -f cloudflare-ddns-Deployment.yaml

🐧 Deploy with Linux + Cron

🏃 Running (all distros)

This script requires Python 3.5+, which comes preinstalled on the latest version of Raspbian. Download/clone this repo and give permission to the project's bash script by running chmod +x ./start-sync.sh. Now you can execute ./start-sync.sh, which will set up a virtualenv, pull in any dependencies, and fire the script.

1. Upload the cloudflare-ddns folder to your home directory /home/your_username_here/

2. Run the following code in terminal

crontab -e

3. Add the following lines to sync your DNS records every 15 minutes

*/15 * * * * /home/your_username_here/cloudflare-ddns/start-sync.sh

Building from source

Create a config.json file with your production credentials.

💖 Please Note

The optional docker-build-all.sh script requires Docker experimental support to be enabled.

Docker Hub has experimental support for multi-architecture builds. Their official blog post specifies easy instructions for building with Mac and Windows versions of Docker Desktop.

1. Choose build platform

• Multi-architecture (experimental) docker-build-all.sh

• Linux/amd64 by default docker-build.sh

2. Give your bash script permission to execute.

sudo chmod +x ./docker-build.sh

sudo chmod +x ./docker-build-all.sh

3. At project root, run the docker-build.sh script.

Recommended for local development

./docker-build.sh

Recommended for production

./docker-build-all.sh

Run the locally compiled version

docker run -d timothyjmiller/cloudflare_ddns:latest

Supported Platforms

• Docker
• Docker Compose
• Kubernetes
• Python 3
• Systemd

📜 Helpful links

• Cloudflare API token
• Cloudflare zone ID
• Cloudflare zone DNS record ID

License

This Template is licensed under the GNU General Public License, version 3 (GPLv3).

Author

Timothy Miller

View my GitHub profile 💡

View my personal website 💻