Jump right into Kubernetes development with career-focused lessons and hands-on practice.

DevOps for Developers

Kubernetes is a powerful container management tool that's taking the world by storm. This detailed course will help you master it.

In this course, you'll start with the fundamentals of Kubernetes and what the main components of a cluster look like. You'll then learn how to use those components to build, test, deploy, and upgrade applications, as well as how to achieve state persistence once your application is deployed. You'll also learn how to secure your deployments and manage resources, which are crucial DevOps skills.

By the time you're done, you'll have a firm grasp on what Kubernetes is, as well as the skills to deploy your own clusters and applications with confidence.

A Practical Guide to Kubernetes

# Why is resource management important?

 Without an indication of how much CPU and memory a container needs, Kubernetes has no other option than to treat all containers equally. That often produces a very uneven distribution of resource usage. Asking Kubernetes to schedule containers without resource specifications is like getting in a boat without a captain.

We have come a long way toward understanding many of the essential Kubernetes object types and principles. One of the most important things we’re still missing is resource management. Kubernetes was blindly scheduling the applications we had deployed so far. We never gave it any indication of how many resources we expect those applications to use, and did not establish any limits.

Without these indications, Kubernetes carried out its tasks in a very myopic fashion. Kubernetes could see a lot, but not enough. We’ll change that soon. We’ll give Kubernetes a pair of glasses that will provide it with much better vision.

Once we learn how to define resources, we’ll go further and make sure that certain limitations are set, some defaults are determined, and there are quotas that will prevent applications from overloading the cluster.

After this chapter, we’ll have enough knowledge tot run Kubernetes in a production environment.



## Enabling Metrics Server

The only new thing we’ll do this time is to enable one more add-on. We’ll add the Metrics Server to the cluster. It’s too soon to explain what it does and why we’ll need it. For now, just remember that there will soon be something in your cluster called Metrics Server.



Learn why resource management is important.

Getting Started with Managing Resources

Why is resource