Applying blue-green deployments on Azure

Now that we've looked at blue-green deployment, we'll look at how to apply it to an Azure infrastructure using two types of components: App Service slots and Azure Traffic Manager.

Let's start by looking at the most basic component: App Service slots.

Using App Service with slots

If we have an Azure subscription and want to use blue-green deployment without investing a lot of effort, we can use App Service slots (web apps or Azure Functions).

In App Services such as a web app, we can create a second instance of our web app by creating a slot for it (up to 20 slots, depending on the application service plan). This slot is a secondary web app but is attached to our main...