OVH DDNS

A linux service to periodically check for public IP address changes. Updates OVH DNS record using Python and the OVH API. Pretty much a dynamic DNS solution.

Requirements

• Linux
  • Python 2.x or Python 3.x with binary in /usr/bin/
  • Pip or Pip3 with binary in /usr/bin/
  • Sudo privileges
• OVH API Credentials
  • Application Key
  • Application Secret
  • Consumer Key
  • Generate new credentials on the OVH token creation page

Installation

## Clone the git repository and move into it
git clone https://github.com/HariboDev/ovh-ddns.git
cd ovh-ddns

## Change the permissions on the setup script to allow for execution
sudo chmod +x ./setup.sh

## Execute the script
## You must be sudo or root
sudo ./setup.sh

The setup.sh script:

• Checks if currently running as sudo or root
• Attempts to locate the Python binaries for Python2.x or Python3.x
• Prefers Python3.x if possible
• Installs dependencies
• Changes the file permissions
• Asks for the following:
  • DNS zone name
  • DNS record ID
  • Subdomain to be updated
  • Record target
  • DNS record TTL (must be int && > 0)
  • Service interval time (must be int && > 0)
• Retrieves the current IP address of the server
• Populates the ovh-ddns.json data file
• Moves the service, Python script and data files to relevent directories
• Reloads the system manager configuration using systemctl daemon-reload
• Asks if you want to load the service on server boot:
  • If so, enables the service using systemctl enable ovh-ddns.service
• Starts the service using systemctl start ovh-ddns.service

Usage

When the service is running, the Python interpreter is used to:

• Check for a change in the server's public IP
• Attempts to update the OVH DNS record
• Updates ovh-dns.json data file to hold the new public IP address

To view the logs to check for success or failures, execute the following command:

sudo journalctl -xe -u ovh-ddns.service -f

Uninstallation

## Move into the directory of the repository
cd ovh-ddns

## Change the permissions on the script to allow for execution
sudo chmod +x ./uninstall.sh

## Execute the script
## You must be sudo or root
sudo ./uninstall.sh

The uninstall.sh:

• Disables the service
• Stops the service
• Deletes the service files
• Deletes the Python script and data files