What happens when a Kubernetes Pod gets deleted?

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888 viewsAugust 17, 2023Cloud Computing Technologies

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ip_in_mydna416 August 17, 2023 0 Comments

Describe what goes on in the background when a Kubernetes Pod gets deleted?

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score 0 · Answer 1 · 2023-08-17T18:50:56+00:00

Here is an explanation of what happens behind the scenes when you perform the command “kubectl delete pod”:

With ‘kubectl delete pod’ action, the pod record in ETCD will be updated by the API Server with two different fields “DeletionTimestamp” and “DeletionGracePeriodSeconds“.
The endpoint controller checks whether the pod has reached ‘terminating state’.
Once the state is reached, it removes the endpoint of the pod from the associated services to prevent external traffic.
The endpoint starts getting removed from kube-proxy, IPtables, Ingress, CoreDNS and all other objects that hold endpoint information.
Kubelet is notified of the pod being updated (Terminating).
If the ‘preStop’ exists, the hook is executed, if not, the kubelet immediately sends a SIGTERM signal to the main container.
After waiting for a graceful shutdown period, which is determined by the terminationGracePeriodSeconds and by default is 30 seconds, the container is forcibly stopped.
Finally, the API Server removes the pod from ETCD completely.