Authors: fire1ce | Created: 2022-04-03 | Last update: 2022-04-03

DDNS Cloudflare Bash Script¶

When building complex infrastructure and managing multiple servers and services using ip addresses is can create a lot of issues and is not always easy to manage. The preferred way is to use a DNS provider that allows you to manage your domain names and their associated IP addresses. DDNS Cloudflare Bash script is a simple bash script that allows you to easily update your Cloudflare's DNS records dinamically regardless of your current IP address.
DDNS Cloudflare Bash Script can be used on Linux, Unix, FreeBSD, and macOS with only one requirment of curl

Source code can be found at DDNS Cloudflare Bash Github Repository.

About¶

DDNS Cloudflare Bash Script for most Linux, Unix distributions and MacOS.
Choose any source IP address to update external or internal (WAN/LAN).
For multiply lan interfaces like Wifi, Docker Networks and Bridges the script will automatically detects the primary Interface by priority.
Cloudflare's options proxy and TTL configurable via the config file.
Optional Telegram Notifications

Requirements¶

curl
Cloudflare api-token with ZONE-DNS-EDIT Permissions
DNS Record must be pre created (api-token should only edit dns records)

Creating 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
Select Create Custom Token
Provide the token a name, for example, example.com-dns-zone-readonly
Grant the token the following permissions: - Zone - DNS - Edit
Set the zone resources to: - Include - Specific Zone - example.com
Complete the wizard and use the generated token at the CLOUDFLARE_API_TOKEN variable for the container

Installation¶

You can place the script at any location manually.

MacOS: Don't use the /usr/local/bin/ for the script location. Create a separate folder under your user path /Users/${USER}

The automatic install examples below will place the script at /usr/local/bin/

wget https://raw.githubusercontent.com/fire1ce/DDNS-Cloudflare-Bash/main/update-cloudflare-dns.sh
sudo chmod +x update-cloudflare-dns.sh
sudo mv update-cloudflare-dns.sh /usr/local/bin/update-cloudflare-dns

Config file¶

You can use default config file update-cloudflare-dns.conf or pass your own config file as parameter to script.

wget https://raw.githubusercontent.com/fire1ce/DDNS-Cloudflare-Bash/main/update-cloudflare-dns.conf

Place the config file in the directory as the update-cloudflare-dns for above example at /usr/local/bin/

sudo mv update-cloudflare-dns.conf /usr/local/bin/update-cloudflare-dns.conf

Config Parameters¶

Option	Example	Description
what_ip	internal	Which IP should be used for the record: internal/external
dns_record	ddns.example.com	DNS A record which will be updated, you can pass multiple A records separated by comma
cloudflare_zone_api_token	ChangeMe	Cloudflare API Token KEEP IT PRIVATE!!!!
zoneid	ChangeMe	Cloudflare's Zone ID
proxied	false	Use Cloudflare proxy on dns record true/false
ttl	120	120-7200 in seconds or 1 for Auto

Optional Notifications Parameters¶

Option	Example	Description
notify_me_telegram	yes	Use Telegram notifications yes/no
telegram_chat_id	ChangeMe	Chat ID of the bot
telegram_bot_API_Token	ChangeMe	Telegram's Bot API Token

Running The Script¶

When placed in /usr/local/bin/

update-cloudflare-dns

With your config file (need to be placed in same folder)

update-cloudflare-dns yoru_config.conf

Or manually

<path>/.update-cloudflare-dns.sh

Automation With Crontab¶

You can run the script via crontab

crontab -e

Examples¶

Run every minute

* * * * * /usr/local/bin/update-cloudflare-dns

Run with your specific config file

* * * * * /usr/local/bin/update-cloudflare-dns myconfig.conf

Run every 2 minutes

*/2 * * * * /usr/local/bin/update-cloudflare-dns

Run at boot

@reboot /usr/local/bin/update-cloudflare-dns

Run 1 minute after boot

@reboot sleep 60 && /usr/local/bin/update-cloudflare-dns

Run at 08:00

0 8 * * * /usr/local/bin/update-cloudflare-dns

Logs¶

This Script will create a log file with only the last run information Log file will be located at the script's location.

Example:

/usr/local/bin/update-cloudflare-dns.log

Limitations¶

Does not support IPv6

License¶

MIT License¶

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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