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Bug 1905195

Summary:	[release-4.6] Detecting broken connections to the Kube API takes up to 15 minutes
Product:	OpenShift Container Platform	Reporter:	Lukasz Szaszkiewicz <lszaszki>
Component:	openshift-apiserver	Assignee:	Lukasz Szaszkiewicz <lszaszki>
Status:	CLOSED ERRATA	QA Contact:	pmali
Severity:	high	Docs Contact:
Priority:	high
Version:	4.6	CC:	aos-bugs, dpateriy, mfojtik, xxia
Target Milestone:	---	Keywords:	UpcomingSprint
Target Release:	4.6.z
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1905194
Clones:	1905991 (view as bug list)		Environment:
Last Closed:	2021-02-08 13:50:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1905194
Bug Blocks:	1905991

Description Lukasz Szaszkiewicz 2020-12-07 17:22:40 UTC

+++ This bug was initially created as a clone of Bug #1905194 +++

All API servers (openshift-apiserver, oauth-server, oauth-apiserver) rely on the TCP stack to detect broken network connections to KAS.
This can take up to 15 minutes. During that time our platform might be unavailable. 


There are already reported cases in which aggregated APIs (i.e. `openshift-apiserver`) were unable to establish a new connection to the Kube API for 15 minutes:

 - after "ungraceful termination" https://bugzilla.redhat.com/show_bug.cgi?id=1881878
 - after a network error https://bugzilla.redhat.com/show_bug.cgi?id=1879232#c39)


Detecting a broken connection should be quicker ideally it should take seconds not minutes.

Comment 1 Xingxing Xia 2021-01-13 12:13:36 UTC

Pravin, when PRs/bug statuses are ready, help verify (or pre-merge verify) openshift-apiserver, oauth-openshift, and oauth-apiserver, see my steps in the 4.7 clone bug 1905194#c14 ~ c16 (you can ignore other preceding exploring comments there).

Comment 2 Lukasz Szaszkiewicz 2021-01-15 10:08:49 UTC

PRs in the merge queue.

Comment 12 errata-xmlrpc 2021-02-08 13:50:52 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 (Important: OpenShift Container Platform 4.6.16 security and bug fix update), 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/RHSA-2021:0308