DO-Dyndns

Automatically update DNS records on DigitalOcean to the current IP of the machine running the script.

Finds the wan IPv4 address of the server it's running on and updates the corresponding DNS records on digital ocean.

This is useful if you don't have a static ip from your ISP.

$ gem install do-dyndns

gem 'do-dyndns', '~> 0.3.0'

require 'do_dydns'

require 'do_dyndns'

updater = DoDyndns::Updater.new(
  token: '...',
  domains: {
    'example.com' => [
      'subdomain'
    ]
  },
  logger: Logger.new($stdout)
)

updater.update_ips # Updates 'subdomain.example.com' to your current IPv4 address

When runninng do_dyndns, the updater reads a configuration file:

Configuration is located at: ~/.config/do-dyndns.yml

if no config file is found, do-dyndns will create one and open it with your $EDITOR

:token: your_digital_ocean_token_here
:domains:
  example-domain1.com:
    - example-subdomain1

$ do-dyndns 
I, [2019-03-26T14:39:20.643564 #11387]  INFO -- : Started IP check
I, [2019-03-26T14:39:20.720905 #11387]  INFO -- : Current WAN IP: **.**.**.**
I, [2019-03-26T14:39:21.977426 #11387]  INFO -- : IPs Match for ***.***.***

Following are examples on how to run this script periodically to update your VPS with the machine's current IP

Check every 15 minutes:

*/15 * * * * /path/to/do-dyndns

Check every 15 minutes:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.pixelfaucet.do-dyndns</string>

    <key>WorkingDirectory</key>
    <string>~/</string>

    <key>UserName</key>
    <string>nobody</string>

    <key>ProgramArguments</key>
    <array>
      <string>~/.rvm/wrappers/ruby-2.6.5@do-dyndns</string>
      <string>do-dyndns</string>
    </array>

    <key>StartInterval</key>
    <integer>900</integer>
  </dict>
</plist>