Summary

In this chapter, we first mentioned the importance of updating an application without causing any downtime. Then, we continued with different strategies to update an application, such as blue-green deployments and rolling updates. We also explored the terminological difference between updating and upgrading software.

In the section that followed, we explored how to update an application in Kubernetes. We studied the different object types in Kubernetes, such as StatefulSets, and explored the existing update strategies that we can use. Then, we performed the most common update strategies: blue-green deployment and rolling updates in Kubernetes. We continued with a hands-on exercise to update a deployment using the rolling update strategy in a Kubernetes cluster.

We then progressed to scaling. We explored its meaning and its importance, especially in DevOps. We introduced different scaling techniques, such as vertical and horizontal scaling. After this, we continued with...