Bug 1933202

Summary:	/etc/resolv.conf is overwritten by Network Manager and missing nameserver
Product:	Red Hat Enterprise Linux 7	Reporter:	Mircea Vutcovici <mircea.vutcovici>
Component:	cloud-init	Assignee:	Eduardo Otubo <eterrell>
Status:	CLOSED DUPLICATE	QA Contact:	xiachen
Severity:	urgent	Docs Contact:
Priority:	high
Version:	7.9	CC:	bfournie, eterrell, gaugu112, hbrock, huzhao, jgreguske, jslagle, mburns, ribarry, sbaker, xiachen, yacao
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	7.9
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-09-02 01:37:42 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mircea Vutcovici 2021-02-25 23:24:35 UTC

Description of problem:
This bug is similar with https://bugzilla.redhat.com/show_bug.cgi?id=1748015
However the cloud-init is the same version as the one in https://access.redhat.com/errata/RHSA-2020:3898


Version-Release number of selected component (if applicable):
- NetworkManager-1.18.8-2.el7_9.x86_64
- cloud-init-19.4-7.el7_9.2.x86_64
- Red Hat OpenStack Platform 13

How reproducible:


Steps to Reproduce:
1. deploy overcloud
2. restart controllers


Actual results:
$ cat /etc/resolv.conf 
# Generated by NetworkManager
search example.com
$

Expected results:
$ cat /etc/resolv.conf
; Created by cloud-init on instance boot automatically, do not edit.
;
# Generated by NetworkManager
search example.com
nameserver 10.91.70.84
nameserver 10.113.103.212
$

Comment 1 Steve Baker 2021-03-02 20:42:22 UTC

Assigning to cloud-init for triage

Comment 9 Mircea Vutcovici 2021-08-31 14:41:32 UTC

Hi Amy,

Yes, I think that BZ#1903146 is matching the same symptoms.
Also the workaround mentioned in https://access.redhat.com/solutions/5837741 is present in openstack-tripleo-heat-templates-8.4.1-86.el7ost.noarch.rpm package:

[supportshell.prod.useraccess-us-west-2.redhat.com] [14:39:02+0000]
[mvutcovi@supportshell openstack-tripleo-heat-templates-8.4.1-86.el7ost.noarch]$ grep -rA8  "dns.*=.*none"
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2:                          - name: Set 'dns=none' in /etc/NetworkManager/NetworkManager.conf
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                            ini_file:
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              path: /etc/NetworkManager/NetworkManager.conf
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              state: present
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              no_extra_spaces: true
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              section: main
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              option: dns
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              value: none
usr/share/openstack-tripleo-heat-templates/common/deploy-steps.j2-                              backup: true


I think you can mark the BZ as duplicate of BZ#1903146.

Thank you,
Mircea

Comment 10 xiachen 2021-09-02 01:37:42 UTC

Hi Mircea,
Got it, thanks for your confirmation.


Close this bug as duplicate of BZ#1903146.

*** This bug has been marked as a duplicate of bug 1903146 ***