Create a generic host in AWS using Terraform and Ansible

For my test projects I've been using Terraform to create a test host within AWS and then apply a configuration with Ansible. This is another less of a snippet and more of a kickstart for creating development hosts.

The full repository is here:
Terraform and Ansible repository

What the terraform script does is:

1. Create an EC2 instance (of type and region specified)
2. Assign a public IP and apply a security group to allow SSH
3. Tag the instance to be found by ansible
4. Create a DNS entry for the newly created host

Then with ansible it will:

1. Apply the hostname
2. Add a user, apply the public key and create a sudoers file
3. Install required packages

The advantage here is that when I need a new host I can quickly start a new instance (in a few minutes) and be able to address that via an easy DNS entry. I can adjust the security groups to allow web traffic if needed. Terraform and ansible are immutable so I can run the scripts as often as I want and push updates to my host if needed.

The advantage of all this means I can create/destroy/update the environment on demand. For instance I mostly work on my personal projects on weekends. I could schedule the creation of the environment on a Friday afternoon and then it's destruction on a Monday morning. This would save a lot of cost in unused AWS EC2 time - A large advantage if I need a GPU instance for Tensorflow. 

There are of course many ways to achieve the same goal. However by using it in this way I can adjust the Terraform scripts to target an instance in VMware or another cloud provider, or even locally. You do not have to rely on AWS only.