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From 9d951d55a1be44bbeb5df485d14d4f84ddf01142 Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Mon, 2 Mar 2020 10:46:35 +0100
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Subject: Remove race condition between cloud-init and NetworkManager
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Message-id: <20200302104635.11648-1-otubo@redhat.com>
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Patchwork-id: 94098
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O-Subject: [RHEL-7.9/RHEL-8.2.0 cloud-init PATCH] Remove race condition between cloud-init and NetworkManager
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Bugzilla: 1807797
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RH-Acked-by: Cathy Avery <cavery@redhat.com>
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RH-Acked-by: Mohammed Gamal <mgamal@redhat.com>
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BZ: 1748015
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BRANCH: rhel7/master-18.5
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BREW: 26924611
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BZ: 1807797
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BRANCH: rhel820/master-18.5
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BREW: 26924957
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cloud-init service is set to start before NetworkManager service starts,
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but this does not avoid a race condition between them. NetworkManager
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starts before cloud-init can write `dns=none' to the file:
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/etc/NetworkManager/conf.d/99-cloud-init.conf. This way NetworkManager
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doesn't read the configuration and erases all resolv.conf values upon
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shutdown. On the next reboot neither cloud-init or NetworkManager will
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write anything to resolv.conf, leaving it blank.
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This patch introduces a NM reload (try-restart) at the end of cloud-init
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start up so it won't erase resolv.conf upon first shutdown.
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x-downstream-only: yes
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resolves: rhbz#1748015, rhbz#1807797 and rhbz#1804780
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Signed-off-by: Eduardo Otubo otubo@redhat.com
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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rhel/systemd/cloud-final.service | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/rhel/systemd/cloud-final.service b/rhel/systemd/cloud-final.service
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index 739b7e3..f303483 100644
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--- a/rhel/systemd/cloud-final.service
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+++ b/rhel/systemd/cloud-final.service
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@@ -11,6 +11,8 @@ ExecStart=/usr/bin/cloud-init modules --mode=final
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RemainAfterExit=yes
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TimeoutSec=0
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KillMode=process
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+ExecStartPost=/bin/echo "try restart NetworkManager.service"
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+ExecStartPost=/usr/bin/systemctl try-restart NetworkManager.service
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# Output needs to appear in instance console output
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StandardOutput=journal+console
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--
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1.8.3.1
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