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