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

# Sequential Breakdown of the Update Process

Let's see what happened when we executed the `kops update` command.

1. Kops retrieved the desired state from the S3 bucket.

2. Kops sent requests to AWS API to change the values of the workers ASG.
3. AWS modified 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 installed Kubelet and Docker and created the manifest file with the list of Pods.
6. Kubelet read the manifest file and run the container that forms the `kube-proxy` Pod (the only Pod on the worker nodes).
7. Kubelet sent 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.

In this lesson, first, we will go through the sequential breakdown of the cluster update process and then verify the update.

Sequential Breakdown and Verification of the Update Process

Sequential Breakdown of the Update Process