Jaeger

After completing this task, you understand how to have your application participate in tracing with Jaeger,regardless of the language, framework, or platform you use to build your application.

This task uses the Bookinfo sample as the example application.

To learn how Istio handles tracing, visit this task’s overview.

Before you begin

• To set up Istio, follow the instructions in the Installation guideand then configure:

a) a demo/test environment by setting the —set values.tracing.enabled=true install option to enable tracing “out of the box”

b) a production environment by referencing an existing Jaeger instance, e.g. created with the operator, and then setting the —set values.global.tracer.zipkin.address=<jaeger-collector-service>.<jaeger-collector-namespace>:9411 install option.

When you enable tracing, you can set the sampling rate that Istio uses for tracing.Use the values.pilot.traceSampling option to set the sampling rate. The default sampling rate is 1%.

• Deploy the Bookinfo sample application.

Accessing the dashboard

Remotely Accessing Telemetry Addons details how to configure access to the Istio addons through a gateway. Alternatively, to use a Kubernetes ingress, specify the option —set values.tracing.ingress.enabled=true during install.

For testing (and temporary access), you may also use port-forwarding. Use the following, assuming you’ve deployed Jaeger to the istio-system namespace:

$ istioctl dashboard jaeger

Generating traces using the Bookinfo sample

• When the Bookinfo application is up and running, access http://$GATEWAY_URL/productpage one or more timesto generate trace information.

To see trace data, you must send requests to your service. The number of requests depends on Istio’s sampling rate.You set this rate when you install Istio. The default sampling rate is 1%. You need to send at least 100 requests before the first trace is visible.To send a 100 requests to the productpage service, use the following command:

$ for i in `seq 1 100`; do curl -s -o /dev/null http://$GATEWAY_URL/productpage; done

• From the left-hand pane of the dashboard, select productpage.default from the Service drop-down list and clickFind Traces:

Tracing Dashboard

• Click on the most recent trace at the top to see the details corresponding to thelatest request to the /productpage:

Detailed Trace View

• The trace is comprised of a set of spans,where each span corresponds to a Bookinfo service, invoked during the execution of a /productpage request, orinternal Istio component, for example: istio-ingressgateway.

Cleanup

• Remove any istioctl processes that may still be running using control-C or:

$ killall istioctl

• If you are not planning to explore any follow-on tasks, refer to theBookinfo cleanup instructionsto shutdown the application.

See also

Zipkin

Learn how to configure the proxies to send tracing requests to Zipkin.

Remotely Accessing Telemetry Addons

This task shows you how to configure external access to the set of Istio telemetry addons.

LightStep

How to configure the proxies to send tracing requests to LightStep.

Overview

Overview of distributed tracing in Istio.

Mixer and the SPOF Myth

Improving availability and reducing latency.

Mixer Adapter Model

Provides an overview of Mixer's plug-in architecture.