Linkerd: Lightweight Service Mesh for Kubernetes

Linkerd is the lightest service mesh, focusing on simplicity and performance. Its Rust-based proxy minimizes resource overhead.

Installation

# Install CLI
curl -sL https://run.linkerd.io/install | sh
export PATH=$PATH:$HOME/.linkerd2/bin

# Check prerequisites
linkerd check --pre

# Install on cluster
linkerd install | kubectl apply -f -

# Verify
linkerd check

Injecting Sidecars

# Annotate namespace
kubectl annotate namespace default linkerd.io/inject=enabled

# Or inject existing deployment
kubectl get deploy -o yaml | linkerd inject - | kubectl apply -f -

Traffic Split

apiVersion: split.smi-spec.io/v1alpha1
kind: TrafficSplit
metadata:
  name: canary-split
spec:
  service: api
  backends:
  - service: api-v1
    weight: 900m
  - service: api-v2
    weight: 100m

Observability

# Dashboard
linkerd viz dashboard

# Metrics
linkerd viz stat deploy

# Top requests
linkerd viz top deploy/api

Summary

Linkerd offers simplicity and low overhead, ideal for teams wanting service mesh benefits without complexity.

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References:

• Linkerd Documentation
• Getting Started