Kubernetes is a powerful tool. It can help you manage complex applications and provide you with the ability to easily automate tasks involved in managing them. In this course, we will start exploring Kubernetes from a beginner's standpoint. We will discuss what Kubernetes is and what it does, and we will work with some of the basic functionality of Kubernetes hands-on. We will build a simple Kubernetes cluster. We will also deploy a sample microservice application to the cluster in order to explore how Kubernetes can help easily manage such applications.

A Practical Guide to Kubernetes

## The Cascaded Deletion

Another handy feature of the Namespaces is their cascading effect. If, for example, we delete the `testing` Namespace, all the objects and the resources running inside it will be removed as well.

kubectl delete ns testing
kubectl -n testing get all

We deleted the `testing` Namespace and retrieved all the objects residing in it. The **output** is as follows.

NAME                              READY STATUS      RESTARTS AGE
po/go-demo-2-api-56dfb69dbd-8w6rf 0/1   Terminating 0        2m
po/go-demo-2-api-56dfb69dbd-hrr4b 0/1   Terminating 0        2m
po/go-demo-2-api-56dfb69dbd-ws855 0/1   Terminating 0        2m
po/go-demo-2-db-5b49cc946b-xdd6v  0/1   Terminating 0        2m

Please note that, in your case, the output might show more objects. If that's the case, you were too fast, and Kubernetes did not yet have time to remove them.

After a second or two, the only objects in the `testing` Namespace are the Pods with the status `terminating`. Once the grace period is over, they will be removed as well. The Namespace is gone, and everything we created in it was removed as well.
### When it Comes in Handy?
The ability to remove a Namespace and all the objects and the resources it hosts is especially useful when we want to create temporary objects. A good example would be continuous deployment (CDP) processes. We can create a Namespace to build, package, test, and do all the other tasks our pipeline requires. Once we're finished, we can simply remove the Namespace. Otherwise, we would need to keep track of all the objects we created and make sure that they are removed before we terminate the CDP pipeline.

## Verification
Now that the Namespace hosting our release 2.0 is gone, we might want to double check that the production release (1.0) is still running.

# The Cascaded Deletion

Another handy feature of the Namespaces is their cascading effect. If, for example, we delete the `testing` Namespace, all the objects and the resources running inside it will be removed as well.

Please note that, in your case, the output might show more objects. If that's the case, you were too fast, and Kubernetes did not yet have time to remove them.

After a second or two, the only objects in the `testing` Namespace are the Pods with the status `terminating`. Once the grace period is over, they will be removed as well. The Namespace is gone, and everything we created in it was removed as well.
## When it Comes in Handy?
The ability to remove a Namespace and all the objects and the resources it hosts is especially useful when we want to create temporary objects. A good example would be continuous deployment (CDP) processes. We can create a Namespace to build, package, test, and do all the other tasks our pipeline requires. Once we're finished, we can simply remove the Namespace. Otherwise, we would need to keep track of all the objects we created and make sure that they are removed before we terminate the CDP pipeline.

# Verification
Now that the Namespace hosting our release 2.0 is gone, we might want to double check that the production release (1.0) is still running.

In this lesson, we will delete the Namespace and everything associated with it.

Deleting a Namespace and All Its Objects

The Cascaded Deletion