Istio in Action by Rinor Maloku & Christian E. Posta

Author:Rinor Maloku & Christian E. Posta [Rinor Maloku]
Language: eng
Format: epub
Publisher: Manning Publications
Published: 2022-04-07T00:00:00+00:00

Pulling a value from environment variables

Pulling a value from request headers

For example, to add a custom tag to our spans in the webapp service, we can annotate the Deployment resource of that workload with the following:

apiVersion: apps/v1 kind: Deployment ... spec: template: metadata: annotations: proxy.istio.io/config: | tracing: sampling: 100 customTags: custom_tag: literal: value: "Test Tag" zipkin: address: zipkin.istio-system:9411

We can apply this deployment of the webapp service like this:

$ kubectl apply \ -f ch8/webapp-deployment-zipkin-tag.yaml \ -n istioinaction

Sending traffic through the ingress gateway generates some of the traces we expect in the Jaeger UI:

$ curl -H "Host: webapp.istioinaction.io" \ http://localhost/api/catalog

Go to the Jaeger UI, find a recent trace, and click it. Then, click the span representing the webapp service, as shown in figure 8.11.

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