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

# Sequential breakdown of the update process

Let’s understand what happens when we execute the `kops update` command.

1. kOps retrieves the desired state from the S3 bucket.

2. kOps sends requests to AWS API to change the values of the workers ASG.
3. AWS modifies the values of the workers ASG by increasing them by 1.
4. ASG created a new EC2 instance to comply with the new sizing.
5. Protokube installs Kubelet and Docker and creates the manifest file with the list of Pods.
6. Kubelet reads the manifest file and runs the container that forms the `kube-proxy` Pod (the only Pod on the worker nodes).
7. Kubelet sends a request to the `kube-apiserver` (through the `dns-controller`) to register the new node and join it to the cluster. The information about the new node is stored in `etcd`.

This process is almost identical to the one used to create the nodes of the cluster.

Understand the sequential breakdown of the cluster update process and verify the update to the cluster.

Sequential Breakdown and Verification of the Update Process

Sequential breakdown of the update process