Setting NTP Server for AWS EC2 instance in User Data

In a previous post I mentioned using a WatchGuard Firebox Cloud as an NTP server.

Here's some sample code.

Our Firebox CloudFormation template provides IP addresses as outputs:

https://github.com/tradichel/PacketCaptureAWS/blob/master/code/resources/firebox-network/firebox.yaml

This python code connects to the Firebox to to enable the NTP server on the Firebox via a lambda function and a key in a secure S3 bucket.

https://github.com/tradichel/PacketCaptureAWS/blob/master/code/resources/firebox-lambda/fireboxconfig.py

Finally, this sample web server shows how pass in the Firebox IP and change the NTP configuration file. Of course you would probably want multiple NTP servers for redundancy.

https://github.com/tradichel/PacketCaptureAWS/blob/master/code/resources/firebox-instances/webserver.yaml