Istio question, where is pilot-discovery command?

In case you are interested in the code: https://github.com/istio/istio/blob/release-1.8/pilot/cmd/pilot-discovery/main.go

pilot-discovery command is command used by pilot, which is part of istiod now.

istiod unifies functionality that Pilot, Galley, Citadel and the sidecar injector previously performed, into a single binary.

You can get your istio pods with

kubectl get pods -n istio-system

Use kubectl exec to get into your istiod container with

kubectl exec -ti <istiod-pod-name> -c discovery -n istio-system -- /bin/bash

Use pilot-discovery commands as mentioned in istio documentation.

e.g.

istio-proxy@istiod-f49cbf7c7-fn5fb:/$ pilot-discovery version                 
version.BuildInfo{Version:"1.8.0", GitRevision:"c87a4c874df27e37a3e6c25fa3d1ef6279685d23", GolangVersion:"go1.15.5", BuildStatus:"Clean", GitTag:"1.8.0-rc.1"}

I compile the binary by myself.

1 download istio project.
2 make build
3 set golang proxy
4 cd out

You will see the binary.