As you have seen in Chapter 1, the Controller Manager is an important piece of the Kubernetes architecture. It embeds several Controllers and the role of each is to watch for instances of a specific high-level resource (Deployments, etc.) and use low-level resources (Pods, etc.) to implement these high-level instances.
As an example, Kubernetes users can create a Deployment when they want to deploy a stateless application. This deployment defines a Pod Template that is used to ...
