Linkerd

Linkerd is a service mesh for Kubernetes and other frameworks. It makes running services easier and safer by giving you runtime debugging, observability, reliability, and security—all without requiring any changes to your code.

CLI

# Mac
brew install linkerd

Install in cluster

linkerd check --pre
linkerd install --crds | kubectl apply -f -
linkerd install | kubectl apply -f -
linkerd check

Run a Demo App

curl --proto '=https' --tlsv1.2 -sSfL https://run.linkerd.io/emojivoto.yml | kubectl apply -f -

# Expose (for reference)
kubectl -n emojivoto port-forward svc/web-svc 8080:80

http://127.0.0.1:8080

Try to vote for the donut emoji, you’ll get a 404 page.

Don’t worry, these errors are intentional. (In a later guide, we’ll show you how to use Linkerd to identify the problem.)

Inject Linkerd

kubectl get -n emojivoto deploy -o yaml \
  | linkerd inject - \
  | kubectl apply -f -

# Check the data planes
linkerd -n emojivoto check --proxy

Viz

linkerd viz install --set dashboard.enforcedHostRegexp=".*" | kubectl apply -f - # install the on-cluster metrics stack
linkerd check

linkerd viz dashboard &

You can now see the dashboard and navigate to the emojivoto namespace.

You should see the web deployment with a Success Rate below 100%.

Expose Permanent

kubectl apply -f linkerd

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Last update: 2023-09-27