ISTIO sidecar for distributed tracing using Jaegar

Question

Evaluating Istio Sidecar proxies around the feature of distributed tracing, currently i am passing the tracing headers and accepting those as a part of the application code, Below are the headers:

  "x-request-id"

  "x-b3-spanid"

  "x-b3-parentspanid"

  "x-b3-sampled"

  "x-b3-flags"

  "x-ot-span-context"

Is there a way where in these headers could be configured to be passed with requests at POD/ingress level so that i do not have to make any changes in the code in order to achieve the tracing between the services?

https://istio.io/docs/tasks/telemetry/distributed-tracing/jaeger/ — ashu, Aug 19 '19 at 08:53
Thats via passing headers in the application code.. can we keep the application agnoist of this? — vaibhav, Aug 19 '19 at 09:08
This is [discussed in the Istio FAQ](https://istio.io/faq/distributed-tracing#istio-copy-headers). — David Maze, Aug 21 '19 at 15:48

score 1 · Answer 1 · answered Aug 21 '19 at 13:34

1

You can use a Virtual Service to add headers to any requests that gets routed by it:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: sample-route
spec:
  hosts:
  - '*'
  http:
  - route:
    - destination:
        host: app.prod.svc.cluster.local
      headers:
        request:
          add:
            key1: value1
            key2: value2

From there, you can attach the Virtual Service to a Gateway for your Ingressgateway.

answered Aug 21 '19 at 13:34

yyyyahir

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But the values here value1 value2 could those be on per request basis? – vaibhav Aug 23 '19 at 02:41
Every request that goes through the route will be tagged. – yyyyahir Aug 23 '19 at 08:57

ISTIO sidecar for distributed tracing using Jaegar

1 Answers1