Chapter 11: Deployment – Deploying Stateless Applications

The previous chapter introduced two important Kubernetes objects: ReplicationController and ReplicaSet. At this point, you already know that they serve similar purposes in terms of maintaining identical, healthy replicas (copies) of Pods. In fact, ReplicaSet is a successor of ReplicationController and, in the most recent versions of Kubernetes, ReplicaSet should be used in favor of ReplicationController.

Now, it is time to introduce the Deployment object, which provides easy scalability, rolling updates, and versioned rollbacks for your stateless Kubernetes applications and services. Deployment objects are built on top of ReplicaSets and they provide a declarative way of managing them – just describe the desired state in the Deployment manifest and Kubernetes will take care of orchestrating the underlying ReplicaSets in a controlled, predictable manner. Alongside StatefulSet, which will be covered in the next...