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)
Part 1: The Fundamentals
Part 2: Istio in Practice
Part 3: Scaling, Extending,and Optimizing

Debugging the Istio agent

In this section, we will read how to troubleshoot any issues in the data plane caused by the misconfiguration of the Istio agent. An Istio agent may not act as expected due to a multitude of reasons; in this section, we will discuss various options to debug and troubleshoot such issues.

The following command can be used to inspect the initial bootstrap configuration file that is used by Envoy to start itself and connect with istiod:

$ istioctl proxy-config bootstrap envoydummy -n chapter11 -o json >bootstrap-envoydummy.json

The bootstrap configuration is composed of the information provided by the Istiod controller during sidecar injection via validation and the sidecar injection webhook.

We can check the certificate and secret configured for Envoy by istio-agent using the following command:

% istioctl proxy-config secret envoydummy -n chapter11
RESOURCE NAME     TYPE        ...