Terraform User Data Scripting for DevOps Engineers: A Bash Deep Dive

https://knowledge.businesscompassllc.com/terraform-user-data-scripting-for-devops-engineers-a-bash-deep-dive/

If you’ve ever spun up an EC2 instance with Terraform and wondered why your app wasn’t running the way you expected, the answer is almost always in the user data script. Terraform user data scripting is one of those skills that separates a DevOps engineer who deploys infrastructure from one who owns it.