This project demonstrates a very simple build and release system that leverages Packer to build immutable artifacts that can easily be deployed on EC2.
Packer is used to execute the .classic/bootstrap.sh script, which allows full
customization of the runtime for a given application. This can be generic and
install all packages itself, start Docker, whatever is necessary.
A more complex project likely would want to include a File provisioner to add source code for the runtime, or potentially even start a Docker container so that the operational runtime and app runtimes are separate.
Deployment is very simple: Once an AMI is available, Terraform updates the
aws_launch_template and applies that update to an aws_autoscaling_group. The
Terraform code here is just an example of what an implementation looks like, and
likely isn't fully functional, but it's a good marker for what the project
should be doing. Additional work around things like VPC, subnets, and target
groups is necessary and are codified with placeholder values.