CloudFlare DDNS api-v4

Do you manage your DNS in CloudFlare but you don't have a static IP? The solution is CF-DDNS-update.sh ! It is available as a minimal Docker image too.
The script will allow you to automatically update an existing DNS record (type A or AAAA) in your CloudFlare account. It works using CloudFlare API-v4 (see documentation here).

Usage

In order to use the script you will need an API Token. You can simply run the script for a single-run update. If you want to maintain your DNS record up to date you have to schedule the execution of the script: you can just add a line in your crontab file.
For further details see the sections below.

API Token

These are the steps to follow to generate the API token:

1. Go here and then in Create Token
2. Create Custom Token -> Get Started
3. Give a name to the Token
4. In Permissions:
   • Zone | Zone | Read
   • Zone | DNS | Write
5. In Zone Resources:
   • Include | Specific zone | your_dns _name_goes_here

Script Settings

The configuration must be held in a separate file or passed via command options.

Command options

This is the mandatory option (with the config file):

• -c config_file_path

These are the mandatory options (without the config file):

• -s security_token
• -r record_name
• -z zone_name

These options can be omitted:

• -t record_type (A for IPv4 or AAAA for IPv6 - Default A)
• -T record_ttl (in seconds - Default 120)
• -p boolean (true if proxied, false otherwise - Default false)
• -f boolean (true if you want to force the update even if the IP isn't changed - Default false)

Configuration file

See cf_ddns_config_sample.sh for an example.

Automatic updates

You can set a crontab entry to schedule the execution of the script.
For example, this entry will execute the script every 10 minutes:

*/10 * * * * /*path_to_the_script*/CF-DDNS-update.sh -c *config_file_path* >> /dev/null 2>&1

You must add the entry at the end of the cron file. To open the cron file run crontab -e.

Log file

If you want the script to log the updates in a file, you can add a file as output:

*/10 * * * * /*path_to_the_script*/CF-DDNS-update.sh -c *config_file_path* >> /var/log/*log_file.log* 2>&1

where /var/log/*log_file.log* must be the full path of your file.

Docker setup

The CloudFlare-ddns Docker image supports amd64, arm64, ppc64le and arm/v7 host architectures. The correct image for your system will automatically be downloaded.

You can simply run:

docker run -d \
  -e CFTOKEN=*token_api_goes_here* \
  -e RECORD_NAME=test.test.com \
  -e ZONE_NAME=test.com \
  --restart always \
  --name cloudflare-ddns \
  antoorofino/cloudflare-ddns

If you want to specify all the options, you should run:

docker run -d \
  -e CFTOKEN=*token_api_goes_here* \
  -e RECORD_NAME=test.test.com \
  -e ZONE_NAME=test.com \
  -e RECORD_TYPE=A \
  -e RECORD_TTL=120 \
  -e RECORD_PROXIED="false" \
  -e FORCE="false" \
  --restart always \
  --name cloudflare-ddns \
  antoorofino/cloudflare-ddns

RUNNING DOCKER IN RASPBERRY

You should add --security-opt seccomp:unconfined paramater to docker run command. See issue.

docker run -d \
  --security-opt seccomp:unconfined \
  -e CFTOKEN=*token_api_goes_here* \
  -e RECORD_NAME=test.test.com \
  -e ZONE_NAME=test.com \
  --restart always \
  --name cloudflare-ddns \
  antoorofino/cloudflare-ddns

IMPORTANT

In order to execute the script you must set the the right execution permissions to the file.
You can simply run:

chmod +x /*path_to_the_script*/CF-DDNS-update.sh

Dependencies

You'll need jq command-line JSON processor.