Is there any reliable means of detecting a kwok cluster?

[taotriad]

When doing sanity checking it's typically a bad sign if there are no nodes and/or pods; especially pods like kubelet...
But in a kwok cluster that's perfectly fine. For a sanity-checker it'd hence be nice to be able to tell between a functional kwok cluster and a non-functional non-kwok cluster. There are also other use-cases where it might be useful to know what cluster is running.

Is there a means to find out, through an API-request, that this is a kwok cluster?

[wzshiming]

The kwok can work together with kubelet in a cluster, so we can only check which nodes are managed by kwok.

I think you can use kubectl get --raw /api/v1/nodes/<node-name>/proxy/metrics to distinguish between them.

[taotriad]

That won't work if no nodes have been added to the cluster yet, since there'll be no node to get metrics from; after running kwokctl create cluster there are no nodes and no pods yet.

I guess what I might want to know is whether the kwok-controller is running or not?

[wzshiming]

There is no way yet. I think it can add a lease to the kwok-controller, and then we can check it.