Updating an Application

In the previous chapter, Configuration and Storage Management in Kubernetes, we saw how to manage configurations and secrets generally as well as in Kubernetes. We also went through the process of handling storage and explored how Kubernetes provides a number of abstractions in order to make this easy for users. After covering configuration and storage management as key practices in DevOps, in this chapter, we will see how we can update and scale an application, as they are equally important practices that we need to apply in DevOps.

Updating an application is an inevitable part of software management – especially DevOps. In continuous integration and delivery, applications can be updated a number of times a day or even an hour. These updates can be disruptive in cases where high availability is a very important function of the application. No user likes to land on a website where they see an error message saying that the service is currently not available...