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Visualizing Metrics with Grafana

This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic. As part of this task, you will use the Grafana Istio add-on and the web-based interface for viewing service mesh traffic data.

The Bookinfo sample application is used as the example application throughout this task.

Before you begin

  • Install Istio in your cluster. If you are installing using Helm, enable the Grafana add-on --set grafana.enabled=trueOption.
  • Deploy Bookinfo application.
  • Ensure that you have Powershell session in your local computer connected to your azure account and the AKS cluster. Refer the "Initial Configuration" exercise for the steps.

Viewing the Istio Dashboard

  1. Verify that the prometheus service is running in your cluster.

    In Kubernetes environments, execute the following command:

    $ kubectl -n istio-system get svc prometheus

    NAME         CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE_

prometheus   10.59.241.54   none        9090/TCP     2m

  2. Verify that the Grafana service is running in your cluster.

    In Kubernetes environments, execute the following command:

    $ kubectl -n istio-system get svc grafana

    NAME      CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE_

grafana   10.59.247.103   none          3000/TCP   2m_

  3. Open the Istio Dashboard via the Grafana UI.

    In your powershell session, execute the following command:

     $ kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=grafana -o jsonpath='{.items[0].metadata.name}') 3000:3000 &

Visit http://localhost:3000/dashboard/db/istio-mesh-dashboard in your web browser.

The Istio Dashboard will look similar to:

                                    Istio Dashboard
  1. Send traffic to the mesh.

For the Bookinfo sample, visit http://$GATEWAY_URL/productpage in your web browser or issue the following command:

$ curl http://$GATEWAY\_URL/productpage

$GATEWAY_URL is the value set in the Bookinfo example.

Refresh the page a few times (or send the command a few times) to generate a small amount of traffic.

Look at the Istio Dashboard again. It should reflect the traffic that was generated. It will look similar to:

                        Istio Dashboard With Traffic

This gives the global view of the Mesh along with services and workloads in the mesh. You can get more details about services and workloads by navigating to their specific dashboards as explained below.

  1. Visualize Service Dashboards.

    From the Grafana dashboard's left hand corner navigation menu, you can navigate to Istio Service Dashboard or visit http://localhost:3000/dashboard/db/istio-service-dashboard in your web browser.

    The Istio Service Dashboard will look similar to:

          Istio Service Dashboard

This gives details about metrics for the service and then client workloads (workloads that are calling this service) and service workloads (workloads that are providing this service) for that service.

  1. Visualize Workload Dashboards.

    From the Grafana dashboard left hand corner navigation menu, you can navigate to Istio Workload Dashboard or visit http://localhost:3000/dashboard/db/istio-workload-dashboard in your web browser.

    The Istio Workload Dashboard will look similar to:

            Istio Workload Dashboard

This gives details about metrics for each workload and then inbound workloads (workloads that are sending request to this workload) and outbound services (services to which this workload send requests) for that workload.

About the Grafana add-on

The Grafana add-on is a preconfigured instance of Grafana. The base image (grafana/grafana:5.2.3) has been modified to start with both a Prometheus data source and the Istio Dashboard installed. The base install files for Istio, and Mixer in particular, ship with a default configuration of global (used for every service) metrics. The Istio Dashboard is built to be used in conjunction with the default Istio metrics configuration and a Prometheus backend.

The Istio Dashboard consists of three main sections:

  1. A Mesh Summary View. This section provides Global Summary view of the Mesh and shows HTTP/gRPC and TCP workloads in the Mesh.
  2. Individual Services View. This section provides metrics about requests and responses for each individual service within the mesh (HTTP/gRPC and TCP). This also provides metrics about client and service workloads for this service.
  3. Individual Workloads View: This section provides metrics about requests and responses for each individual workload within the mesh (HTTP/gRPC and TCP). This also provides metrics about inbound workloads and outbound services for this workload.

For more on how to create, configure, and edit dashboards, please see the Grafana documentation.

Cleanup

  • Remove any kubectl port-forward processes that may be running:
$ killall kubectl
  • If you are not planning to explore any follow-on tasks, refer to the Bookinfo cleanup instructions to shutdown the application.