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Bug 1933202 - /etc/resolv.conf is overwritten by Network Manager and missing nameserver
Summary: /etc/resolv.conf is overwritten by Network Manager and missing nameserver
Keywords:
Status: CLOSED DUPLICATE of bug 1903146
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: cloud-init
Version: 7.9
Hardware: x86_64
OS: Linux
high
urgent
Target Milestone: rc
: 7.9
Assignee: Eduardo Otubo
QA Contact: xiachen
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-02-25 23:24 UTC by Mircea Vutcovici
Modified: 2021-09-02 01:37 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-09-02 01:37:42 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1748015 1 high CLOSED [cloud-init][RHEL7] /etc/resolv.conf lose config after reboot (initial instance is ok) 2023-12-15 16:44:01 UTC
Red Hat Knowledge Base (Solution) 5837741 0 None None None 2021-02-26 00:11:34 UTC

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 ***
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