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?
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: value2From there, you can attach the Virtual Service to a Gateway for your Ingressgateway.