Highly Available Applications Running on Top of Kubernetes

Now that you've had a chance to spin up an EKS cluster and learn about Ingress, let's introduce you to our application. We have provided an example application that has a flaw that prevents it from being cloud-native and really being able to be horizontally scaled in Kubernetes. We will deploy this application in the following exercise and observe its behavior. Then, in the next section, we will deploy a modified version of this application and observe how it is more suited to achieve our stated objective of being highly available.

Exercise 12.03: Deploying a Multi-Replica Non-HA Application in Kubernetes

In this exercise, we will deploy a version of the application that's not horizontally scalable. We will try to scale it and observe the problem that prevents it from being scaled horizontally:

Note

We have provided the source code for this application in the GitHub repository for reference. However...