Thanks @bryce for the detailed updates.

For us personally its the second time we run into a docker daemon
restart on production (including all container restarts).

The only reason why this time it got much more attention is that a bug
prevented a clean restart of the daemon, leaving containers offline.

This fact tells us that most of the people never noticed that their
containers were also during the last update restartet. (Which is fine
because mostly a short restart, for example of a webserver nobody would
notice)

This is also fine of most of our servers because they running
lightweight containers.

The only reason why we noticed it (this and last time) is that we
running heavy database containers (for example elasticsearch with couple
of TBs) which have a restart time of minutes instead of seconds.

Especially its critical (and loosing consistency) when containers of the
same kind get restarted at the same time.

All of this chain is triggered by the unattended updates. Thats why we
excluded the automatic updates for the docker package.

But this doesnt help if depending package updates still restarting the
docker daemon/containers.

Since the unattended package is still marked as 'wont-fix', and the
dependencies problem is explained above..

The only way to safely prevent docker daemon restarts is to fully
disable the whole unattended updates? Can someone confirm this?

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to unattended-upgrades in
Ubuntu.
https://bugs.launchpad.net/bugs/1906364

Title:
  unattended-upgrade still restarts blacklisted daemons

Status in docker.io package in Ubuntu:
  In Progress
Status in unattended-upgrades package in Ubuntu:
  Won't Fix
Status in docker.io source package in Xenial:
  In Progress
Status in unattended-upgrades source package in Xenial:
  Won't Fix
Status in docker.io source package in Bionic:
  In Progress
Status in unattended-upgrades source package in Bionic:
  Won't Fix
Status in docker.io source package in Focal:
  In Progress
Status in unattended-upgrades source package in Focal:
  Won't Fix
Status in docker.io source package in Groovy:
  In Progress
Status in unattended-upgrades source package in Groovy:
  Won't Fix
Status in docker.io source package in Hirsute:
  In Progress
Status in unattended-upgrades source package in Hirsute:
  Won't Fix

Bug description:
  Hello,

  Today plenty of our systems running ubuntu 20.04 were restarting the
  docker daemon, even if i blacklisted the docker package. Since docker
  has an dependency on containerd thats the reason why it was restarted.
  IMO the blacklist should also check the full tree of dependencies...
  This should NOT happen!

  From the log you find:

  2020-12-01 06:40:13,881 INFO Starting unattended upgrades script
  2020-12-01 06:40:13,882 INFO Allowed origins are: o=Ubuntu,a=focal, 
o=Ubuntu,a=focal-security, o=UbuntuESMApps,a=focal-apps-security, 
o=UbuntuESM,a=focal-infra-security
  2020-12-01 06:40:13,882 INFO Initial blacklist: docker docker.io
  2020-12-01 06:40:13,882 INFO Initial whitelist (not strict):
  2020-12-01 06:40:19,139 INFO Packages that will be upgraded: containerd 
qemu-block-extra qemu-kvm qemu-system-common qemu-system-data qemu-system-gui 
qemu-system-x86 qemu-utils
  2020-12-01 06:40:19,140 INFO Writing dpkg log to 
/var/log/unattended-upgrades/unattended-upgrades-dpkg.log
  2020-12-01 06:40:46,996 INFO All upgrades installed
  2020-12-01 06:40:50,732 INFO Starting unattended upgrades script
  2020-12-01 06:40:50,732 INFO Allowed origins are: o=Ubuntu,a=focal, 
o=Ubuntu,a=focal-security, o=UbuntuESMApps,a=focal-apps-security, 
o=UbuntuESM,a=focal-infra-security
  2020-12-01 06:40:50,733 INFO Initial blacklist: docker docker.io
  2020-12-01 06:40:50,733 INFO Initial whitelist (not strict):

  Also this happened for us on plenty of our servers almost at the same
  (why the unattended updates are not spread over time?), which
  destroyed the second time an production environment.

  This is not how unattended-upgraded should be, sadly this package lost
  our trust and we disable it and schedule the 'unattended updates' now
  on our own.

  PS: Not to say that on some servers the docker daemon did not even
  restart..

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