How to expose cluster+project values to container in GKE (or current-context in k8s)

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My container code needs to know in which environment it is running on GKE, more specifically what cluster and project. In standard kubernetes, this could be retrieved from current-context value (gke_<project>_<cluster>).

Kubernetes has a downward api that can push pod info to containers - see https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/ - but unfortunately nothing from "higher" entities.

Any thoughts on how this can be achieved ?

Obviously I do not want to explicit push any info at deployment (e.g. as env in the configMap). I rather deploy using a generic/common yaml and have the code at runtime retrieve the info from env or file and branch accordingly.

google-kubernetes-engine kubernetes
1 Answers

You can query the GKE metadata server from within your code. In your case, you'd want to query the /computeMetadata/v1/instance/attributes/cluster-name and /computeMetadata/v1/project/project-id endpoints to get the cluster and project. The client libraries for each supported language all have simple wrappers for accessing the metadata API as well.

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