Buoyant Enterprise for Linkerd vs Istio

Buoyant Enterprise for Linkerd (BEL) is Buoyant’s enterprise distribution of Linkerd, a service mesh for Kubernetes. It encrypts meshed traffic with mutual TLS and offers latency-based load balancing, timeouts, retries, circuit breaking, gRPC load balancing and blue-green or canary deployments. It supports communication across clusters, federated services and automatic cross-cluster failover. Observability includes layer 7 success-rate and latency metrics, Prometheus-compatible metric exports and OpenTelemetry tracing. High Availability Zone-aware Load Balancing keeps requests in-zone under normal load and sends them to other zones when local endpoints are overloaded or return errors. Supported environments include Kubernetes and managed or self-hosted distributions such as Amazon EKS, Google GKE, Microsoft Azure AKS, Oracle OKE, Rancher RKE2 and Red Hat OpenShift. Linux VM workloads are supported in Premium and Strategic; the product also describes management of non-Kubernetes workloads including Windows VMs. It is free to try, and companies with fewer than 50 employees can use it in production at any scale. Premium and Strategic pricing is available by request.

Istio is a free, open-source service mesh that adds security, connectivity, and monitoring for distributed applications with few or no service-code changes. It manages HTTP, gRPC, WebSocket, and TCP traffic, with automatic load balancing, routing rules, retries, failovers, and fault injection. Deployment options include sidecar mode and ambient mode, which uses a per-node Layer 4 proxy and can optionally add a per-namespace Envoy proxy for Layer 7 features. The control plane runs on Kubernetes, while the mesh can extend to other clusters, virtual machines, and endpoints outside Kubernetes. Security capabilities include workload identity, mutual TLS, authentication, authorization policies, and audit tools. Istio can generate traffic metrics, logs, and traces, including for ingress and egress. It can be installed with istioctl or Helm, and its integrations documentation covers tools such as Prometheus, Grafana, Jaeger, Kiali, and cert-manager. Istio 1.31 supports Kubernetes versions 1.32 through 1.36. Supported releases receive critical-issue patches and technical assistance from the community; development builds have no support.