Book Image

IoT Edge Computing with MicroK8s

By : Karthikeyan Shanmugam
Book Image

IoT Edge Computing with MicroK8s

By: Karthikeyan Shanmugam

Overview of this book

Are you facing challenges with developing, deploying, monitoring, clustering, storing, securing, and managing Kubernetes in production environments as you're not familiar with infrastructure technologies? MicroK8s - a zero-ops, lightweight, and CNCF-compliant Kubernetes with a small footprint is the apt solution for you. This book gets you up and running with production-grade, highly available (HA) Kubernetes clusters on MicroK8s using best practices and examples based on IoT and edge computing. Beginning with an introduction to Kubernetes, MicroK8s, and IoT and edge computing architectures, this book shows you how to install, deploy sample apps, and enable add-ons (like DNS and dashboard) on the MicroK8s platform. You’ll work with multi-node Kubernetes clusters on Raspberry Pi and networking plugins (such as Calico and Cilium) and implement service mesh, load balancing with MetalLB and Ingress, and AI/ML workloads on MicroK8s. You’ll also understand how to secure containers, monitor infrastructure and apps with Prometheus, Grafana, and the ELK stack, manage storage replication with OpenEBS, resist component failure using a HA cluster, and more, as well as take a sneak peek into future trends. By the end of this book, you’ll be able to use MicroK8 to build and implement scenarios for IoT and edge computing workloads in a production environment.
Table of Contents (24 chapters)
1
Part 1: Foundations of Kubernetes and MicroK8s
4
Part 2: Kubernetes as the Preferred Platform for IOT and Edge Computing
7
Part 3: Running Applications on MicroK8s
14
Part 4: Deploying and Managing Applications on MicroK8s
21
Frequently Asked Questions About MicroK8s

CNI overview

Before diving into a CNI overview, let’s understand how networking is handled within a Kubernetes cluster.

When Kubernetes schedules a Pod to execute on a node, the node’s Linux kernel generates a network namespace for the Pod. This network namespace establishes a virtual network interface (VIF) between the node’s physical network interface—such as eth0—and the Pod, allowing packets to flow to and from the Pod. The related VIF in the root network namespace of the node connects to a Linux bridge, allowing communication between Pods on the same node. A Pod can also use the same VIF to send packets outside of the node.

From a range of addresses reserved for Pods on the node, Kubernetes assigns an IP address (Pod IP address) to the VIF in the Pod’s network namespace. This address range is a subset of the cluster’s IP address range for Pods, which you can specify when you build a cluster.

The network namespace used...