Public bug reported:
unattended-upgrades attempted to upgrade nova from 2:17.0.9-0ubuntu1 to
2:17.0.10-0ubuntu2.1 (bionic-security), however nova-common contains a
modified conffile (/etc/nova/nova.conf) which prompts during upgrade and
leaves apt/dpkg in a permanent error state requiring manual
intervention. It also prevents other automated apt install operations
from working while in this state.
I understand that this conffile prompt is a generally known problem and
that unattended-upgrades specifically attempts to skip upgrades that
have such a conffile prompt, however that did not work on this case. I
am filing this bug to try and identify and resolve the cause and this
affected multiple systems in an Ubuntu OpenStack deployment.
rbalint advised that this is very likely a more complex interaction with the
exact upgrades that were being staged at the time and hence more logs would be
needed, indeed attempting to reproduce this very simply with a downgrade of
nova packages to 2:17.0.0-0ubuntu1 results in it being skipped, as expected:
root@juju-c21ec6-bionic-nova-7:/home/ubuntu# unattended-upgrade
Package nova-common has conffile prompt and needs to be upgraded manually
And from the unattended-upgrades log we can see that 179 packages in
total were scheduled to upgrade together during this run.
Attaching the following logs files:
/var/log/unattended-upgrades/*
/var/log/dpkg*
dpkg_-l (As at 2020-04-27 16:22, the same time period as the
unattended-upgrades logs, but the dpkg.log* files were taken later but also
cover the full time period from before 2019-12-28 and after 2020-04-27).
The first instance of the failure is in unattended-upgrades.log.4.gz Line 161
"2019-12-28 06:15:29,837 Packages that will be upgraded: amd64-microcode...
[truncated, 179 packages total]"
That relates to the output in unattended-upgrades-dpkg.log.4.gz Line 791
"Log started: 2019-12-28 06:25:56"
Which relates to the output of dpkg.log.6.gz Line 392
"2019-12-28 06:25:56 upgrade nova-compute-kvm:all 2:17.0.9-0ubuntu1
2:17.0.10-0ubuntu2.1"
It fails many times after that as anytime you attempt to install a
package, it attempts to configure nova.conf again and exits with an
error again. But that is the original failure. But note that various
package upgrades happened by unattended-upgrades (and possibly other
sources) in the intervening 4 months and so I guess reproducing the
situation may require reverse engineering the original package list from
the dpkg logs. I have not currently attempted to do that with the hopes
intimate knowledge of the unattended-upgrades code and logs will make
that process faster.
A full sosreport from the system is available if more information is
required that will include other log files, and various other command
outputs. It is not uploaded initially for privacy.
** Affects: unattended-upgrades (Ubuntu)
Importance: Undecided
Status: New
** Tags: sts
** Tags added: sts
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https://bugs.launchpad.net/bugs/1893889
Title:
unattended-upgrade of nova-common failure due to conffile prompt
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