Book Image

Bootstrapping Service Mesh Implementations with Istio

By : Anand Rai
4 (1)
Book Image

Bootstrapping Service Mesh Implementations with Istio

4 (1)
By: Anand Rai

Overview of this book

Istio is a game-changer in managing connectivity and operational efficiency of microservices, but implementing and using it in applications can be challenging. This book will help you overcome these challenges and gain insights into Istio's features and functionality layer by layer with the help of easy-to-follow examples. It will let you focus on implementing and deploying Istio on the cloud and in production environments instead of dealing with the complexity of demo apps.  You'll learn the installation, architecture, and components of Istio Service Mesh, perform multi-cluster installation, and integrate legacy workloads deployed on virtual machines. As you advance, you'll understand how to secure microservices from threats, perform multi-cluster deployments on Kubernetes, use load balancing, monitor application traffic, implement service discovery and management, and much more. You’ll also explore other Service Mesh technologies such as Linkerd, Consul, Kuma, and Gloo Mesh. In addition to observing and operating Istio using Kiali, Prometheus, Grafana and Jaeger, you'll perform zero-trust security and reliable communication between distributed applications. After reading this book, you'll be equipped with the practical knowledge and skills needed to use and operate Istio effectively.
Table of Contents (19 chapters)
1
Part 1: The Fundamentals
5
Part 2: Istio in Practice
10
Part 3: Scaling, Extending,and Optimizing

Summary

In this chapter, we prepared a local environment to install Istio using istioctl which is the Istio command-line utility. We then enabled sidecar injection by applying a label called istio-injection: enabled to the namespace that hosts the microservices.

We briefly looked at Kubernetes admission controllers and how mutating admission webhooks inject sidecars to the deployment API calls to the Kubernetes API server. We also read about gateways and looked at the sample Ingress and Egress gateways that are installed with Istio. The gateway is a standalone istio-proxy, aka an Envoy proxy, and is used to manage Ingress and Egress traffic to and from the mesh. Following this, we looked at how various ports are configured to be exposed on the Ingress gateway and how traffic is routed to upstream services.

Istio provides integration with various telemetry and observability tools. The first tool we looked at was Kiali, the visualization tool providing insight into traffic flows...