Book Image

Mastering Elastic Kubernetes Service on AWS

By : Malcolm Orr, Yang-Xin Cao (Eason)
5 (1)
Book Image

Mastering Elastic Kubernetes Service on AWS

5 (1)
By: Malcolm Orr, Yang-Xin Cao (Eason)

Overview of this book

Kubernetes has emerged as the de facto standard for container orchestration, with recent developments making it easy to deploy and handle a Kubernetes cluster. However, a few challenges such as networking, load balancing, monitoring, and security remain. To address these issues, Amazon EKS offers a managed Kubernetes service to improve the performance, scalability, reliability, and availability of AWS infrastructure and integrate with AWS networking and security services with ease. You’ll begin by exploring the fundamentals of Docker, Kubernetes, Amazon EKS, and its architecture along with different ways to set up EKS. Next, you’ll find out how to manage Amazon EKS, encompassing security, cluster authentication, networking, and cluster version upgrades. As you advance, you’ll discover best practices and learn to deploy applications on Amazon EKS through different use cases, including pushing images to ECR and setting up storage and load balancing. With the help of several actionable practices and scenarios, you’ll gain the know-how to resolve scaling and monitoring issues. Finally, you will overcome the challenges in EKS by developing the right skill set to troubleshoot common issues with the right logic. By the end of this Kubernetes book, you’ll be able to effectively manage your own Kubernetes clusters and other components on AWS.
Table of Contents (28 chapters)
1
Part 1: Getting Started with Amazon EKS
7
Part 2: Deep Dive into EKS
13
Part 3: Deploying an Application on EKS
20
Part 4: Advanced EKS Service Mesh and Scaling
24
Part 5: Overcoming Common EKS Challenges

Creating a new cluster and migrating workloads

As you can see, a typical upgrade will involve at least three steps:

  1. Upgrading the control plane
  2. Upgrading/replacing the worker nodes with more up-to-date AMIs and the kubelet
  3. At least upgrading the core components, kube-proxy, coreDNS, and vpc-cni

In this approach, the Pods must first be drained and reallocated to worker nodes as they are replaced. This can lead to interruptions if not managed well. An alternative is to deploy a new cluster and then migrate workloads; this is sometimes referred to as blue/green cluster deployment.

Important note

This will be the least cost-effective approach as you will be paying for two control planes but may be suitable if you want to try to minimize disruption. We will only discuss this approach at a high level in this book as the most common approach is to upgrade the EKS control plane and then the worker nodes using managed worker nodes, greatly reducing cost and complexity...