Update KEP with new name: PodReadyToStartContainers condition #3778

ddebroy · 2023-01-24T17:02:24Z

One-line PR description: Update KEP with PodReadyToStartContainers condition and updating milestone for Beta

Issue link: Pod conditions around readiness to start containers after completion of pod sandbox creation #3085

Other comments: This KEP updates the name of the condition to PodReadyToStartContainers (from the previous PodHasNetwork that sig-network had concerns with) as previously discussed with sig-node and sig-network leads. The description of the condition and goals are updated accordingly.

Signed-off-by: Deep Debroy <ddebroy@gmail.com>

dchen1107 · 2023-01-24T18:51:52Z

/lgtm
/approve

Not sure the new name is better than the previous one though since it implies that if a pod can start the container purely depends on the network, which is not true. But I am not good at naming, go with the majority here. :-)

ddebroy · 2023-01-24T19:53:14Z

/hold

for sig-network lgtm as well.

aojea · 2023-01-25T00:08:04Z

/lgtm

previous name imply a lot of things for the network that may not be true or may be misleading, no strong opinion about the name, but I'll adventure to throw a suggestion: PodInitialized 😄

mrunalp · 2023-01-25T19:48:13Z

I like PodInitialized :)

ddebroy · 2023-01-31T22:15:50Z

Latest commit updates the PRR section to Beta. No other sections already LGTM ed were altered.

mrunalp · 2023-02-01T21:52:06Z

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

+and CNI plugins). Completion of all these phases puts the pod sandbox in a
+state where the containers in a pod can be started. This KEP proposes a
+`PodReadyToStartContainers` condition in pod status to indicate a pod has
+reached a state where it's containers are ready to be started. The


mrunalp · 2023-02-01T22:11:40Z

/lgtm

cici37

Couple comments regarding with PRR.
One more question regarding with Will enabling / using this feature result in increasing time taken by any operations covered by existing SLIs/SLOs?(Ask here since cannot comment on unchanged line), due to Pod startup latency SLI/SLO details, will this feature slightly add up on the latency?

/cc @johnbelamaric

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

cici37 · 2023-02-02T11:52:19Z

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

+```
+apiserver_request_total{verb="PATCH", resource="pods", subresource="status"}
+```
+for this.


Increase of this metrics could potentially be caused by other issue besides current feature. Is there any other info cluster admin could use to inform a rollback due to PodReadyToStartContainersCondition issue?

There isn't any specific metric right now for distinct Pod Status updates (specific pod conditions or other aspects of pod status like container statuses). We may consider that as an independent enhancement to the Kubelet status manager (covering all pod status fields) as mentioned below.

Do you know if there is a node label on those metrics? If the spike is specifically from nodes with this feature enabled, that could be why. I believe @logicalhan recently added feature gate metrics, so in theory you could construct a query that looked for spikes only on nodes with the feature enabled.

There is no originating node label on the API Server request metrics here: https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apiserver/pkg/endpoints/metrics/metrics.go#L80

ddebroy · 2023-02-08T00:18:15Z

One more question regarding with Will enabling / using this feature result in increasing time taken by any operations covered by existing SLIs/SLOs?(Ask here since cannot comment on unchanged line), due to Pod startup latency SLI/SLO details, will this feature slightly add up on the latency?

This may result in more API calls from Kubelet Status Manager to API server (under certain circumstances when the Kubelet Status Manager did not batch a bunch of updates for some reason). This aspect is covered under the section ###### Will enabling / using this feature result in any new API calls?

No specific SLIs or metrics are surfaced by Kubelet associated with distinct pod status updates. So that can be considered a separate enhancement to broadly address the overall Kubelet Status manager.

johnbelamaric · 2023-02-08T01:13:38Z

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

+```
+apiserver_request_total{verb="PATCH", resource="pods", subresource="status"}
+```
+for this.


Do you know if there is a node label on those metrics? If the spike is specifically from nodes with this feature enabled, that could be why. I believe @logicalhan recently added feature gate metrics, so in theory you could construct a query that looked for spikes only on nodes with the feature enabled.

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

Signed-off-by: Deep Debroy <ddebroy@gmail.com>

ddebroy · 2023-02-09T02:24:41Z

@johnbelamaric @cici37 the PRR section has been updated with the suggestions above. Please note that the update (scoped to the last commit) also removed the original LGTM from sig-node reviews.

johnbelamaric

/approve
/lgtm

johnbelamaric · 2023-02-09T03:23:21Z

keps/sig-node/3085-pod-conditions-for-starting-completition-of-sandbox-creation/README.md

+```
+apiserver_request_total{verb="PATCH", resource="pods", subresource="status"}
+```
+for this.


k8s-ci-robot · 2023-02-09T03:24:47Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dchen1107, ddebroy, johnbelamaric

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ddebroy · 2023-02-09T04:24:56Z

/unhold

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Update KEP with PodReadyToStartContainers condition for Beta

d052b7b

Signed-off-by: Deep Debroy <ddebroy@gmail.com>

ddebroy force-pushed the sandbox2 branch from 4994c9f to d052b7b Compare January 24, 2023 17:10

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Pod conditions around readiness to start containers after completion of pod sandbox creation #3085

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Enhancement: Marking a pending pod as failed after a certain timeout kubernetes/kubernetes#113211

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KEP-3815 : Add Condition for Pending Pods that are stuck due to configuration errors #3816

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Update PRR for Beta

78574a3

Signed-off-by: Deep Debroy <ddebroy@gmail.com>

ddebroy force-pushed the sandbox2 branch from f0eeb64 to 78574a3 Compare February 9, 2023 02:23

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feat: rename PodHasNetwork to PodReadyToStartContainers kubernetes/kubernetes#117702

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ddebroy changed the title ~~Update KEP with PodReadyToStartContainers condition for Beta~~ Update KEP with new name: PodReadyToStartContainers condition Jun 15, 2023

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[KEP-3085] Add condition for sandbox creation (xposted from original issue) #4138

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Update KEP with new name: PodReadyToStartContainers condition #3778

Update KEP with new name: PodReadyToStartContainers condition #3778

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Update KEP with new name: PodReadyToStartContainers condition #3778

Update KEP with new name: PodReadyToStartContainers condition #3778

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