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

Installing and using Calico network policies

By default, all Pods in all namespaces in a cluster can communicate with each other. This might be desirable, but, in many cases, you want to take a least privilege approach to network access. Fortunately, Kubernetes provides network policies to restrict access between Pods (west-to-east communication). A network policy operates at Layer 3 and Layer 4 of the OSI model and, as such, is equivalent to a traditional on-premises firewall or AWS security group. More details can be found at https://kubernetes.io/docs/concepts/services-networking/network-policies/.

The EKS VPC CNI doesn’t support network policies, so a network plugin or different CNI is required. In this section, we use the Calico (https://www.projectcalico.org/) policy engine, which is the simplest way to add network policies while still using the AWS VPC CNI. We will create a new IPv4 cluster using eksctl with the following configuration file, myipv4cluster.yaml:

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