npm install -g slack-openvpn
In order to configure slack-openvpn you will need to set up an incoming webhook into your Slack team. To do this, you will need to install the Incoming WebHooks app. Once installed, copy the value inside Webhook URL. We will need to set this in the next step.
In your OpenVPN config on your server add the following lines to your config:
client-connect "/usr/bin/env slack-openvpn --webhookUrl YOUR_WEBHOOK_URL --action connect"
client-disconnect "/usr/bin/env slack-openvpn --webhookUrl YOUR_WEBHOOK_URL --action disconnect"
Restart OpenVPN
sudo service openvpn restart
Now connect to your vpn. You now have slack notifications configured with OpenVPN!