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Accepted
Ben Davis
Asked: 2020-07-31 14:50:44 +0800 CST

How can I get the status of multiple kubernetes resources in a single API call?

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I'm using the python kubernetes client to control deployment of resources. I'd like to poll the status of multiple resources at once to provide near-realtime feedback on when a given set of resources is available. Right now I have to query each resources individually, which seems excessive on a system where each set of resources scales by N users (so if there are 6 resources there would be N(6) requests for a status check).

Is there way to query the API and get the status of all resources that match a given label selector? If not, is there another approach I should consider?

kubernetes

1 Answers

  1. Best Answer

    get the status of all resources that match a given label selector?

    I started out by seeing how kubectl does it, because at high enough verbosity levels, it shows the actual underlying HTTP transactions:

    kubectl --v=8 get deploy,pod  -l app.kubernetes.io/name=something

    seems to issue two separate GET calls, so I believe it is just putting them in flight concurrently and then awaiting the threads.

    As for the other half of your question,

    kubectl --v=8 get all -l app.kubernetes.io/name=something

    does the same thing as the CSV version, but instead appears to do something akin to kubectl api-resources (or maybe has a hard-coded list of what it considers all?) and then does the same thing: putting multiple GET in flight and awaiting the threads

    You may be interested in exploring how kubectl rollout status operates, to see if that might help you. I also tried adding --watch to the get all and was informed:

    F0730 21:55:36.819494 2887268 helpers.go:115] error: you may only specify a single resource type

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