Setup as a service on MacOS using launchd

Create a file called ~/Library/LaunchAgents/r53-ddns.plist as the current user:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>r53-ddns</string>
    <key>ProgramArguments</key>
    <array>
        <string>/opt/homebrew/bin/r53-ddns</string>
        <string>-s=net</string>
        <string>-d=example.com</string>
        <string>-c=300</string>
    </array>
    <key>KeepAlive</key>
    <true/>
</dict>
</plist>

Set up the AWS credentials file in default location for the current user.

To load and start your service run the folowing:

launchctl load ~/Library/LaunchAgents/r53-ddns.plist

The service should startup each time the user logs in