Certified Kubernetes Administrator (CKA) Practice Test

The Deployment object is used to manage the deployment of a set of replica pods in Kubernetes. It provides declarative updates to applications, enabling you to describe the desired state for your pods, and it works to maintain that state. When you create a Deployment, it automatically creates a ReplicaSet, which in turn manages the actual pods that are running.

Deployments are particularly useful for handling rolling updates and rollbacks, allowing for an efficient way to update an application without downtime. They manage the lifecycle of the pods and ensure that the specified number of replicas are always running, handling failures by automatically recreating pods as necessary.

While a ReplicaSet itself can manage a specified number of pods, it does not provide the more advanced features that a Deployment offers, such as easy updates and rollbacks. Other objects like DaemonSet and StatefulSet serve different purposes unrelated to standard deployment scenarios. DaemonSet ensures that a copy of a pod runs on all or some nodes, while StatefulSet is used for managing stateful applications that require stable network identities and persistent storage.