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emojivoto example

The Kubernetes cluster will run the emojivoto applications and a jaeger UI for visualizing the OpenTelemetry traces:

Deployed Applications

The different emojivoto applications are communicating via gRPC. Instrumenting those applications would allow us to view the gRPC requests between the applications.

Deploying the emojivoto application

Run the following command:

kubectl -n test create -f https://raw.githubusercontent.com/Fish-pro/observer/examples/emojivoto/emoji

Deploying the observer

Deploy the observer object for the application to be delivered

kubectl -n test create -f - <<EOF
apiVersion: ob.observer.io/v1alpha1
kind: Observer
metadata:
  labels:
    app.kubernetes.io/name: observer
    app.kubernetes.io/instance: observer-sample
    app.kubernetes.io/part-of: observer
    app.kubernetes.io/managed-by: kustomize
    app.kubernetes.io/created-by: observer
  name: observer-sample
spec:
  resourceSelectors:
    - apiVersion: apps/v1
      kind: Deployment
      name: emoji
    - apiVersion: apps/v1
      kind: Deployment
      name: voting
    - apiVersion: apps/v1
      kind: Deployment
      name: web
  launcher:
    imageRepository: keyval/launcher
    imageTag: v0.1
  agent:
    imageRepository: keyval/otel-go-agent
    imageTag: v0.6.0
  jaeger:
    name: jaeger
    serviceType: NodePort
    imageRepository: jaegertracing/opentelemetry-all-in-one
    imageTag: latest
    replicas: 1
    labels:
      app: observer
EOF

Perform actions on the target Application

Now all that left to do is to perform some actions on the target application that will cause the creation of detailed distributed traces.

Port forward to the frontend service:

kubectl port-forward svc/web-svc 8080:80 -n emojivoto

Go to http://localhost:8080, and click the view the leaderboard button.

Viewing the traces

First, port forward to the Jaeger UI:

kubectl port-forward svc/jaeger 16686:16686 -n emojivoto

Then, open the Jaeger UI in your browser by navigating to http://localhost:16686/

After selecting the emojivoto-web service, you should see the following traces: Traces