Bug 1983695

Summary:	Size of the hostname was preventing proper DNS resolution of the worker node names
Product:	OpenShift Container Platform	Reporter:	OpenShift BugZilla Robot <openshift-bugzilla-robot>
Component:	Networking	Assignee:	Ben Nemec <bnemec>
Networking sub component:	mDNS	QA Contact:	Aleksandra Malykhin <amalykhi>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	high
Priority:	high	CC:	amalykhi, amcdermo, aos-bugs, bnemec, gferrazs, hpokorny, mkalinin, vfarias, vvoronko
Version:	4.6.z	Keywords:	Triaged
Target Milestone:	---
Target Release:	4.7.z
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-09-01 18:23:56 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:	1915122
Bug Blocks:	1896751, 1983690

Comment 2 Aleksandra Malykhin 2021-08-22 15:14:41 UTC

Verified on  4.7.0-0.nightly-2021-08-21-153346

The verification flow:

1. change hostname to new longer one on master-0-0

[core@master-0-0 ~]$ sudo hostnamectl set-hostname masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0.ocp-edge-cluster-0.qe.lab.redhat.com
[core@master-0-0 ~]$ hostname
masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0.ocp-edge-cluster-

2. restart mdns pod

[core@master-0-0 ~]$ sudo vi /etc/kubernetes/manifests/mdns-publisher.yaml (changed value of the deletionGracePeriodSeconds - pod restarted)


3. check log file on the master:
oc logs -n openshift-kni-infra mdns-publisher-master-0-0.ocp-edge-cluster-0.qe.lab.redhat.com                         

time="2021-08-22T15:12:43Z" level=info msg="Publishing with settings" collision_avoidance=hostname ip="fd2e:6f44:5dd8::6c"
time="2021-08-22T15:12:43Z" level=info msg="Binding interface" name=br-ex
time="2021-08-22T15:12:43Z" level=debug msg="Changing service name" new="ocp-edge-cluster-0 Workstation-masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0" original="ocp-edge-cluster-0 Workstation"
time="2021-08-22T15:12:43Z" level=info msg="Publishing service" domain=local. hostname=masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0.local. name="ocp-edge-cluster-0 Workstation-masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0" port=42424 ttl=3200 type=_workstation._tcp
time="2021-08-22T15:12:43Z" level=info msg="Truncating long service name 'ocp-edge-cluster-0 Workstation-masteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-0' to 'ocp-edge-cluste06bed01003bbb7ff2136e424e3bc1cceaaaaaaaaaaaaaa-0'"
time="2021-08-22T15:12:43Z" level=info msg="Zeroconf registering service" name=ocp-edge-cluste06bed01003bbb7ff2136e424e3bc1cceaaaaaaaaaaaaaa-0
time="2021-08-22T15:12:43Z" level=info msg="Zeroconf setting service ttl" name=ocp-edge-cluste06bed01003bbb7ff2136e424e3bc1cceaaaaaaaaaaaaaa-0 ttl=3200


the new hostname is changed to random word in the middle as per request.

Comment 5 errata-xmlrpc 2021-09-01 18:23:56 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 4.7.28 security 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-2021:3262