Cloudflare DDNS updater with Bash and Crontab

About

• Cloudflare DDNS updater with Bash.
• Detects host IP and updates cloudflare A record if it is different (supports Cloudflare Proxy).
• API Token is only supported for security reasons.

Requirements

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

How to create Cloudflare API Token?

• Open https://dash.cloudflare.com/profile/api-tokens
• Click Cretea Token
• Select Use template for Edit zone DNS
• Set permissions to Zone - DNS - Edit
• Set zone resource to Include - Specific zone - domain.com
• Click Continue to summary and Create Token
• Use the newly created token in this script

Installation

url="https://raw.githubusercontent.com/leomoon-studios/cloudflare-ddns-with-bash/main/src/ddns"
sudo wget $url -O /usr/local/bin/ddns
sudo chmod +x ddns

Examples

In these examples we're using 5SPAFH7MF6Xgqe2wDoFsjNB5ZngSvxbAZ25AHart as API token.

Updating domain.com record (root) for domain.com zone in verbose mode.

ddns -z domain.com -a test.domain.com -t 5SPAFH7MF6Xgqe2wDoFsjNB5ZngSvxbAZ25AHart -v

Updating test.domain.com record for domain.com zone in verbose mode.

ddns -z domain.com -a test.domain.com -t 5SPAFH7MF6Xgqe2wDoFsjNB5ZngSvxbAZ25AHart -v

Automating with Crontab

Run every 5 minutes

*/5 * * * * /usr/local/bin/ddns -z domain.com -a test.domain.com -t 5SPAFH7MF6Xgqe2wDoFsjNB5ZngSvxbAZ25AHart