This document explains how to use the DDNS-Cloudflare-bash script to dynamically update DDNS with CloudFlare using API keys. I am using a bash script from this public Github repository DDNS-Cloudflare-Bash. This repository is simply the documentation of how to use the script in the DDNS-Cloudflare-Bash repository.
I am using this script to update a FQDN DNS record automagically through crontab on multiple Linux virtual private servers in different cloud regions.
Warning
I am using a TTL of 120 seconds on the FQDN record. You might see this TTL value as low. Feel free to change it when modifying the script variables.
Login to your Cloudflare account and navigate to the home page (websites tab):
Navigate to the DNS zone records:
Create the record you wish to modify with DDNS (the record must exist before using it with the script):
Note
You can add an invalid IP or a documentation IP in the type A record. Example: 198.51.100.1 (documentation range IP). Tip: Do not try to resolve the record before it updates.
Get the zone id from cloudflare:
Navigate to your profile to create an API key for the script:
Create a new API token:
Change the name of the token to something you will recognize in the future in case you need to create more tokens:
It should look similar to this at the end:
Create the token:
Make sure to copy the API token as you won't be able to view it again when you go to API tokens in your account:
Add a user for the script (non-privileged user):
sudo adduser --disabled-password --gecos "" cloudflare-ddnsSwitch to the new user:
sudo su cloudflare-ddns
Install the script in the non-privileged user directory:
mkdir $HOME/cloudflare-ddns/; cd $HOME/cloudflare-ddns/; \
wget https://raw.githubusercontent.com/fire1ce/DDNS-Cloudflare-Bash/main/update-cloudflare-dns.sh; \
wget https://raw.githubusercontent.com/fire1ce/DDNS-Cloudflare-Bash/main/update-cloudflare-dns.conf; \
chown $USER:$USER -R $HOME/cloudflare-ddns; chmod 600 update-cloudflare-dns.conf; \
chmod 700 update-cloudflare-dns.shEdit the config file to add your parameters to it:
nano $HOME/cloudflare-ddns/update-cloudflare-dns.confModify the variables in the config file:
Important
You only need to modify the following variables:
dns_record: The fully qualified domain name of the record the script should update in your DNS zone (example: test.mydomain.com)zoneid: The Zone ID you copied in the previous section.cloudflare_zone_api_token: The API token you generated in the previous section.proxied: Keep set tofalseif you need this record to be a DNS only record without Cloudflare proxy.ttl: This is the Time To Live (TTL) for your DNS record. The minimum allowed by this script is 120 seconds (2 minutes).
run the script to test it:
./update-cloudflare-dns.sh ./update-cloudflare-dns.confIf you do not get any errors proceed to adding a crontab for this script:
Important
Do not run this command with sudo. The whole point of creating a new user for the script is so that it runs as an unprivileged user.
crontab -eAdd the following line to the bottom of the user crontab:
* * * * * $HOME/cloudflare-ddns/update-cloudflare-dns.sh update-cloudflare-dns.confSave the crontab and exit from the user account:
exit
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