In the previous chapter, we familiarized ourselves with AWS. We also created an EC2 instance and deployed a Hello World web application onto it. However, to get there, we had to go through a number of steps to configure the instance and its security groups. Because we did that in a very manual fashion using the command-line interface, the steps that we went through will not be reusable or auditable, as you may recall from the first chapter when implementing DevOps best practices. Two key concepts that you should rely on as often as possible are source control (version control) and automation. In this chapter, we will explore how to apply those principles to our infrastructure.
In a cloud environment, where almost everything is abstracted and served through the intermediary of virtual resources, it is easy to imagine that code can...
