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I have an asp.net core 3.1 web api app. Can I write an end point by which if I call this the entire application will go into hung or deadlock situation? or a background task where I wrote some code to make this happen?

I am trying to test Kubernetes Liveness probe which I wrote as a health check endpoint in asp.net core web API application.

Thanks.

Nestor Daniel Ortega Perez
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user584018
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  • could you explain why you need to make it stuck in a deadlock / hang situation? – Raymond Hartoyo Dec 08 '21 at 08:17
  • @Raymond, I would like to test kubernetes liveness probe and as a simulation I want the deadlock/hung state, so that POD/container automatically re-start. I have asked similar question here, https://stackoverflow.com/questions/70271108/is-deadlock-or-application-hung-state-possible-for-asp-net-core-web-api-applicat – user584018 Dec 08 '21 at 08:29
  • ok posted an answer, hope that helps. – Raymond Hartoyo Dec 08 '21 at 16:30

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If it's for testing some kind of hung situation, you can do something like making the thread / process to sleep. Make sure that the sleep period is greater than the timeoutSeconds configuration of the livenessProbe.

Or if you want to simulate the app to be down, you can also return http status >= 400 (ex: 500 / Internal Server Error) in the API response, so that livenessProbe will think the app is not healthy.

livenessProbe also has failureThreshold which is used to indicate how many failures to tolerate before K8 will terminate the pod, so if you want the pod to be terminated after just 1 failure, set it to 1.

Raymond Hartoyo
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  • Thanks @Raymond. This what I also know, but in run time I want to make application unavailable by making some deadlock or any other way. Please check my other question here, https://stackoverflow.com/questions/70271108/is-deadlock-or-application-hung-state-possible-for-asp-net-core-web-api-applicat, if you have some thoughts please let me know – user584018 Dec 09 '21 at 07:00