AWS App Mesh vs Linkerd

AWS App Mesh is a managed service for visibility and traffic control between services. It uses the open source Envoy proxy to handle traffic into and out of service containers, and can change routes between services without application-code changes. Proxies balance client traffic and adjust endpoints using health checks and service registration. App Mesh provides metrics and logs for service hops, and can collect traces to help visualize service API calls. It works with AWS Fargate, Amazon ECS, Amazon EKS, Amazon EC2 and Kubernetes on EC2. Mutual TLS verifies service identities using certificates from AWS Certificate Manager Private Certificate Authority or a customer-managed certificate authority. Listed integrations include Amazon CloudWatch and AWS X-Ray, plus tools such as Datadog, HashiCorp and Sysdig. There is no additional charge for App Mesh itself, but proxy-consumed AWS resources are billed separately. AWS states support ends on September 30, 2026; after that, the console and App Mesh resources will no longer be accessible. API clients must support TLS 1.2; AWS recommends TLS 1.3.

Linkerd is a service mesh for Kubernetes that adds runtime debugging, observability, reliability and security without requiring changes to application code. It installs into a Kubernetes cluster and injects sidecar proxies into workload pods. The mesh handles HTTP, HTTP/2, gRPC and arbitrary TCP traffic, including TLS connections and WebSockets. It automatically enables mutual TLS between meshed applications and supports authorization policies between services. Metrics include request volume, success rates and latency distributions for HTTP, HTTP/2 and gRPC, plus TCP-level metrics. Traffic controls include load balancing, retries, timeouts, dynamic routing, traffic splitting and rate limiting. Linkerd can use Prometheus and Grafana and supports distributed tracing. Its Linkerd Viz Prometheus instance retains metrics for a short fixed interval, currently six hours, so it is intended to supplement an existing metrics store. Installation requires a modern Kubernetes cluster and a working kubectl command. The open-source project is licensed under Apache 2.0; Buoyant offers commercial support, training and architecture reviews. The listed plan is free.