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When I am trying to send an HTTP request from one pod to another pod within my cluster, how do I target it? By the cluster IP, service IP, serivce name? I can not seem to find any documentation on this even though it seems like such a big part. Any knowledge would help. Thanks!

matt
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    [Connecting Applications with Services](https://kubernetes.io/docs/concepts/services-networking/connect-applications-service/) in the Kubernetes documentation seems relevant. In general you can use the destination service name as a DNS name. – David Maze May 22 '19 at 22:53

2 Answers2

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DNS for Services and Pods should help you here.

apiVersion: v1
kind: Service
metadata:
  name: myservice
  namespace: mynamespace
spec:
  selector:
    name: myapp
  type: ClusterIP
  ports:
  - name: http
    port: 80
    targetPort: 80

Lets say you have a service defined as such and you are trying to call the service from the same namespace. You can call http://myservice.svc.cluster.local:80. If you want to call the service from another namespace you can use http://myservice.mynamespace.svc.cluster.local:80

Sean Boczulak
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As @David Maze mentioned, you can find more information about:

Shortly:

Please exec into your pod:

kubectl exec -it <your_pod> -- /bin/bash

perform:

nslookup <your_service>

In that way you can check if your service is working using DNS (assuming your service is working in default namespace) you should see:

<your_service>.default.svc.cluster.local

than you can check:

curl http://<your_service>
or
curl http://<your_service>.default.svc.cluster.local
Mark
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