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

Configuring EKS networking using the VPC CNI

As discussed previously, the AWS VPC CNI is installed by default, but you may need to upgrade the CNI to use prefix assignment mode, for example, or change a configuration parameter. The following sections will take you through configuration steps for common tasks.

Managing the CNI plugin

The simplest way to carry out an upgrade of the CNI for a new cluster is to apply the new Kubernetes manifest. The following code snippet will install version v1.9.1 onto your cluster and change the version as desired. Be aware, however, that downgrading the CNI version can be very tricky and, in some cases, will not work!

In a script or CI/CD pipeline, it’s often a good idea to be able to export the version of the currently running CNI (as long as it is deployed). The following code snippet will allow you to do that:

$ export CNI_VER=$(kubectl describe daemonset aws-node --namespace kube-system | grep Image | cut -d "/" -f...