How do you implement Kubernetes service mesh with Istio for microservices communication?

Istio service mesh provides advanced traffic management, security, and observability for microservices communication in Kubernetes clusters.\n\nIstio Components:\n• Envoy Proxy: Sidecar proxy for traffic interception\n• Istiod: Control plane for configuration and certificates\n• Ingress Gateway: Entry point for external traffic\n• Egress Gateway: Exit point for outbound traffic\n\nTraffic Management:\n• Virtual Services: Traffic routing rules\n• Destination Rules: Load balancing and circuit breaking\n• Gateways: Ingress and egress configuration\n• Service Entries: External service registration\n\nSecurity Features:\n• Mutual TLS: Automatic encryption between services\n• Authorization Policies: Fine-grained access control\n• Request Authentication: JWT validation\n• Security Policies: Workload-level security\n\nExample Virtual Service:\napiVersion: networking.istio.io/v1beta1\nkind: VirtualService\nmetadata:\n name: reviews\nspec:\n http:\n - match:\n - headers:\n end-user:\n exact: jason\n route:\n - destination:\n host: reviews\n subset: v2\n\nBest Practices:\n• Gradual rollout with canary deployments\n• Implement proper observability\n• Use security policies consistently\n• Monitor service mesh performance\n• Regular certificate rotation