In order to understand the Terraform concepts that will be presented in this chapter, you need to have read Chapter 2, Provisioning Cloud Infrastructure with Terraform.
We will look at an example of how to implement blue-green deployment in Azure. If you don't have an Azure subscription, you can create a free Azure account here: https://azure.microsoft.com/en-gb/free/.
Then, we will look at an example of how to use feature flags in an ASP.NET Core application. To use our example, you will need to install the .NET Core SDK, which can be downloaded from https://dotnet.microsoft.com/download.
For code editing, we used the free Visual Studio Code editor, which is available for download here: https://code.visualstudio.com/.
The complete source code for this chapter can be found at https://github.com/PacktPublishing/Learning_DevOps/tree/master/CHAP13.
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