Overview

Microservices architectures push networking concerns out of application code and into the infrastructure layer. Service discovery, load balancing, retries, timeouts, mutual authentication, and traffic shaping all need to work reliably across hundreds of services without requiring every team to implement them independently. Istio solves this by deploying Envoy sidecar proxies alongside every workload, creating a service mesh that handles cross-cutting concerns transparently at the network level. Istio in Practice gives engineers the depth they need to deploy, configure, and operate Istio with confidence. Starting from the control plane architecture and the data plane mechanics of Envoy, the book progresses through traffic management primitives, progressive delivery strategies, security policies, observability integration, and production operations. Each chapter connects architecture to real engineering decisions: how to structure routing rules, how to enforce mutual TLS across namespaces, how to implement canary rollouts safely, and how to debug mesh issues before they become outages. Inside the book, you will learn: - how Istio's control plane configures Envoy sidecars via xDS APIs - how VirtualService, DestinationRule, and Gateway resources control traffic flow - how to implement canary deployments, traffic mirroring, and fault injection - how mutual TLS, authorization policies, and request authentication enforce zero-trust networking - how to integrate Prometheus, Grafana, Jaeger, and Kiali for full-stack observability - how to debug common mesh problems including proxy misconfiguration, certificate rotation failures, and resource exhaustion - how Istio compares to Linkerd, Consul Connect, and cloud-provider service mesh offerings Written for backend engineers, platform architects, and infrastructure teams, this book turns Istio from a complex installation into a well-understood, production-ready networking layer for Kubernetes.

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