[Question] custom setup with group of instances?

[vsoch]

Hi! 👋 I'm new to terraform, and I'm looking to create a set of EC2 instances that can see one another. I've done this on Google Cloud, and for that strategy I use a common module to setup networking, and then I have some logic in the startup script to use the Google metadata API to get the ips for other instances. I'm looking for a similar setup for AWS. To be specific, my questions are:

• Is there an example using this network hub alongside creating instances that can easily see one another?
• What are best practices to share ip addresses between the instances?

Thanks for your help!