Just to add, we also attempted to work around this by adding a systemd
override to netplan to recycle the keepalived service whenever network
management was restarted.  While it corrected the issue, it also created
another problem whereby the system hung on startup after a reboot
waiting endlessly for the network daemon to start.  I had to revert this
change in light of this.

For now, I've disabled ubuntu auto update task completely and hopefully
this will avoid any network service restarts until the issue is resolved
within the package.

-- 
You received this bug notification because you are a member of Ubuntu
High Availability Team, which is subscribed to keepalived in Ubuntu.
https://bugs.launchpad.net/bugs/1810583

Title:
  Daily cron restarts network on unattended updates but keepalived
  .service is not restarted as a dependency

Status in keepalived package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04
  ii  keepalived                            1:1.3.9-1ubuntu0.18.04.1          
amd64        Failover and monitoring daemon for LVS clusters

  (From unanswered
  https://answers.launchpad.net/ubuntu/+source/keepalived/+question/676267)

  Since two weeks we lost our keepalived VRRP address on on our of
  systems, closer inspection reveals that this was due to the daily
  cronjob.Apparently something triggered a udev reload (and last week
  the same seemed to happen) which obviously triggers a network restart.

  Are we right in assuming the below patch is the correct way (and
  shouldn't this be in the default install of the systemd service of
  keepalived).

  /etc/systemd/system/multi-user.target.wants/keepalived.service:
  --- keepalived.service.orig 2018-11-20 09:17:06.973924706 +0100
  +++ keepalived.service 2018-11-20 09:05:55.984773226 +0100
  @@ -4,6 +4,7 @@
   Wants=network-online.target
   # Only start if there is a configuration file
   ConditionFileNotEmpty=/etc/keepalived/keepalived.conf
  +PartOf=systemd-networkd.service

  Accompanying syslog:
  Nov 20 06:34:33 ourmachine systemd[1]: Starting Daily apt upgrade and clean 
activities...
  Nov 20 06:34:42 ourmachine systemd[1]: Reloading.
  Nov 20 06:34:44 ourmachine systemd[1]: message repeated 2 times: [ Reloading.]
  Nov 20 06:34:44 ourmachine systemd[1]: Starting Daily apt download 
activities...
  Nov 20 06:34:44 ourmachine systemd[1]: Stopping udev Kernel Device Manager...
  Nov 20 06:34:44 ourmachine systemd[1]: Stopped udev Kernel Device Manager.
  Nov 20 06:34:44 ourmachine systemd[1]: Starting udev Kernel Device Manager...
  Nov 20 06:34:44 ourmachine systemd[1]: Started udev Kernel Device Manager.
  Nov 20 06:34:45 ourmachine systemd[1]: Reloading.
  Nov 20 06:34:45 ourmachine systemd[1]: Reloading.
  Nov 20 06:35:13 ourmachine systemd[1]: Reexecuting.
  Nov 20 06:35:13 ourmachine systemd[1]: Stopped Wait for Network to be 
Configured.
  Nov 20 06:35:13 ourmachine systemd[1]: Stopping Wait for Network to be 
Configured...
  Nov 20 06:35:13 ourmachine systemd[1]: Stopping Network Service..

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