[Question] how does drain-timeout work?

[Willi#m ⬣]

How does drain-timeout work? Does it affect the time between the sending of SIGTERM to pods and actual node deletion?

[Etienne]

Hi @williamli, it depends on both the --drain-timeout flag and the value defined via in the deployment configuration pod.spec.terminationGracePeriodSeconds. By default, both values are set to 300seconds. If you send a SIGTERM to the estafette-gke-preemptible-killer pod while draining a node, then Kubernetes will wait a maximum of 300seconds before force killing the pod. If the draining process finish before that, then the pod is gracefully shut down.

The logic is defined in the following file:
https://github.com/estafette/estafette-gke-preemptible-killer/blob/master/kubernetes.go#L160-L245

[Willi#m ⬣]

Thanks