Summary

This a chapter covered a plethora of information on building scalable applications. The goal was to show you how to scale deployments with Kubernetes, which was achieved by creating multiple instances of your application.

We started the chapter by looking at how to define the use of a load balancer and leverage the deployment scale feature in Kubernetes to achieve scalability. With this type of scalability, you can also achieve failover by using a load balancer and multiple instances of the software for stateless applications. We also looked into using the HPA to automatically scale your deployment based on load.

After that, we looked at how you can scale the cluster itself. First, we manually scaled the cluster, and afterward we used a cluster autoscaler to scale the cluster based on application demand.

We finished the chapter by looking into different ways to upgrade a deployed application: first, by exploring updating YAML files manually, and then by learning two...