Bug 1739085

Summary: Multi-version CRDs and admission webhooks do not play nicely together in OpenShift 4.1
Product: OpenShift Container Platform Reporter: Paul Morie <pmorie>
Component: kube-apiserverAssignee: Stefan Schimanski <sttts>
Status: CLOSED ERRATA QA Contact: scheng
Severity: high Docs Contact:
Priority: high    
Version: 4.1.0CC: afield, aos-bugs, mfojtik, nstielau, rrajasek, xxia
Target Milestone: ---   
Target Release: 4.1.z   
Hardware: Unspecified   
OS: Unspecified   
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Clone Of:
: 1739235 (view as bug list) Environment:
Last Closed: 2019-08-28 19:54:50 UTC Type: Bug
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Bug Depends On: 1739235    
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Description Paul Morie 2019-08-08 13:08:02 UTC 
Description of problem:

When multiple versions of a CRD is declared, and webhooks for that resource exist, sometimes create/update operations will fail with an error like:

See upstream issue: https://github.com/kubernetes/kubernetes/issues/73752

A fix for this issue was recently merged upstream to the release-1.13 branch: https://github.com/kubernetes/kubernetes/pull/79495

We have applied this patch to the openshift release-4.1 branch and established that this appears to fix the issue on 4.1.

It is critical in order to run Knative on OpenShift 4.1 that this bug be included in the next z-stream release.

Version-Release number of selected component (if applicable):

4.1

How reproducible:

Intermittent; required restart of API server pod in order to reliably trigger

Steps to Reproduce:
1. Create a CRD with multiple versions
2. Create an admission webhook for the resource
3. Create/update the resource

Actual results:

Error from server (InternalError): Internal error occurred: no kind "Service" is registered for version "serving.knative.dev/v1beta1" in scheme "k8s.io/apiextensions-apiserver/pkg/apiserver/apiserver.go:62"

Expected results:

Updates should result in admission webhook being triggered / normal admission flow.


Additional info:
Comment 2 scheng 2019-08-21 11:33:29 UTC 
Following https://bugzilla.redhat.com/show_bug.cgi?id=1739235#c2 steps,no such issue found.

# oc get clusterversion
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.1.0-0.nightly-2019-08-21-023728   True        False         2m47s   Cluster version is 4.1.0-0.nightly-2019-08-21-023728
Comment 4 errata-xmlrpc 2019-08-28 19:54:50 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2547