How to monitor executing of `preStop` command?

I just want to add for the preStop hook, the pod may be terminated and not available to describe.

Another way to see the preStop error log is via kubectl events:

kubectl get events | grep FailedPreStopHook

Example:

kubectl get events | grep FailedPreStopHook                                    
5m33s       Warning   FailedPreStopHook   pod/pod-name-59988c4675-79q4p                              
Exec lifecycle hook ([/bin/kill -s SIGQUIT 1]) for Container "container_name" in Pod "pod-name-59988c4675-79q4p_namespace(556dc3d2-9da4-11ea-bca3-00163e01eb9a)" failed - error: 
command '/bin/kill -s SIGQUIT 1' exited with 1: kill: can't kill pid 1: Operation not permitted

I was looking for something, so I added some logging that help to see the logs of the script in the pod's stdout/stderr logs.

so for me, this approach help me

• To write logs to the centralized logging system (help me to check logs in datadog)
• Verify the script is executed properly

          lifecycle:
            preStop:
              exec:
                command: ["/bin/sh", "-c", "/clean.sh > /proc/1/fd/1"]          

and was able to verify the logs

kubectl get pods

kubectl logs -f my_stohook_pod

/proc/PID/fd/1 will help us to redirect script logs stdout/stderr of the container main process.

From https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/#debugging-hook-handlers

The logs for a Hook handler are not exposed in Pod events. If a handler fails for some reason, it broadcasts an event. [...] For PreStop, this is the FailedPreStopHook event. You can see these events by running kubectl describe pod <pod_name>. Here is some example output of events from running this command [...]