Website: Are all container probes by the kubelet optional?

[adityamandhare]

This is a Bug Report

Problem:
The page https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/ states that:
The kubelet can optionally perform and react to three kinds of probes on running Containers.
Are all the three probes livenessProbe, readinessProbe and startupProbe really optional? is a Kubelet not required to have at least one probe into the container to check its status? If not how will the kubelet know if the container is down?

Proposed Solution:
If at least on of the container probe is required, then it should be explicitly mentioned that although it is not required to have all of them but at least of of the probe must exist. Again this is only if the at least one of the probe is required.

Page to Update:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/

[tengqm]

I think the current docs are correct. A kubelet does not rely on the probes for determining whether a container is alive or ready. The kubelet gets all its need from the underlying container runtime which manages the container's lifecycle.

[sftim]

The current documentation is accurate; all three kinds of probe are optional.

@adityamandhare I'll close this
/close

[k8s-ci-robot]

@sftim: Closing this issue.

In response to this:

The current documentation is accurate; all three kinds of probe are optional.

@adityamandhare I'll close this
/close

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