Docker CloudFlare DDNS

This small Alpine Linux based Docker image will allow you to use the free CloudFlare DNS Service as a Dynamic DNS Provider (DDNS).

This is a multi-arch image and will run on amd64 and aarch64 devices, including the Raspberry Pi.

Image Variants

Image Tag	Architecture	OS
amd64	x64	Alpine Linux
aarch64	arm64v8	Alpine Linux

Usage

Quick Setup:

docker run \
  -e API_KEY=Cloudflare API token \
  -e ZONE=example.org \
  -e SUBDOMAIN=prueba \
  -e PROXIED=false \
  juanico/cloudflare:<tag>

Parameters

--restart=always - ensure the container restarts automatically after host reboot.
-e API_KEY - Your CloudFlare scoped API token. See the Creating a Cloudflare API token below. Required
- API_KEY_FILE - Path to load your CloudFlare scoped API token from (e.g. a Docker secret). If both API_KEY_FILE and API_KEY are specified, API_KEY_FILE takes precedence.
-e ZONE - The DNS zone that DDNS updates should be applied to. Required
- ZONE_FILE - Path to load your CloudFlare DNS Zone from (e.g. a Docker secret). If both ZONE_FILE and ZONE are specified, ZONE_FILE takes precedence.
-e SUBDOMAIN - A subdomain of the ZONE to write DNS changes to. If this is not supplied the root zone will be used.
- SUBDOMAIN_FILE - Path to load your CloudFlare DNS Subdomain from (e.g. a Docker secret). If both SUBDOMAIN_FILE and SUBDOMAIN are specified, SUBDOMAIN_FILE takes precedence.

Optional Parameters

-e PROXIED - Set to true to make traffic go through the CloudFlare CDN. Defaults to false.
-e RRTYPE=A - Set to AAAA to use set IPv6 records instead of IPv4 records. Defaults to A for IPv4 records.
-e DELETE_ON_STOP - Set to true to have the dns record deleted when the container is stopped. Defaults to false.
-e INTERFACE=tun0 - Set to tun0 to have the IP pulled from a network interface named tun0. If this is not supplied the public IP will be used instead. Requires --network host run argument.
-e CUSTOM_LOOKUP_CMD="echo '1.1.1.1'" - Set to any shell command to run them and have the IP pulled from the standard output. Leave unset to use default IP address detection methods.
-e DNS_SERVER=10.0.0.2 - Set to the IP address of the DNS server you would like to use. Defaults to 1.1.1.1 otherwise.
-e CRON="@daily" - Set your own custom CRON value before the exec portion. Defaults to every 5 minutes - */5 * * * *.

Depreciated Parameters

-e EMAIL - Your CloudFlare email address when using an Account-level token. This variable MUST NOT be set when using a scoped API token.

Creating a Cloudflare API token

To create a CloudFlare API token for your DNS zone go to https://dash.cloudflare.com/profile/api-tokens and follow these steps:

Click Create Token
Provide the token a name, for example, cloudflare-ddns
Grant the token the following permissions:
- Zone - Zone Settings - Read
- Zone - Zone - Read
- Zone - DNS - Edit
Set the zone resources to:
- Include - All zones
Complete the wizard and copy the generated token into the API_KEY variable for the container

Multiple Domains

If you need multiple records pointing to your public IP address you can create CNAME records in CloudFlare.

IPv6

If you're wanting to set IPv6 records set the envrionment variable RRTYPE=AAAA. You will also need to run docker with IPv6 support, or run the container with host networking enabled.

Docker Compose

If you prefer to use docker Compose:

version: '2'
services:
  cloudflare-ddns:
    image: juanico/cloudflare:<tag>
    restart: always
    environment:
      - API_KEY=Cloudflare API token
      #- EMAIL=email
      - ZONE=example.org    #solo el dominio
      - SUBDOMAIN=prueba    #solo el subdominio sin el dominio
      - PROXIED=false

JuanRodenas/cloudflare-ddns