[Bug 1711428] Re: cloud-init sometimes fails on dpkg lock due to concurrent apt-daily-upgrade.service execution

[Steve Langasek]

On Thu, Aug 17, 2017 at 07:20:20PM -0000, Jim Browne wrote:
> Hmmm.  I confirm what you see.

> I think this problem is arising because we have Packer run (due to LP#1693361):
>     systemctl disable apt-daily.service
>     systemctl disable apt-daily.timer

> when building the AMI.

> I guess if apt-daily.service is disabled the Before is not transitive
> from cloud-init to apt-daily-upgrade via apt-daily?  Not seeing anything
> definitive in the docs after a quick glance.

Correct.  Before/After only establishes ordering between enabled services
and is ignored for services that are not enabled.

Fixing this to enforce that apt-daily.service and apt-daily-upgrade.service
are both always enabled/disabled together would be done by adding
'Requires=apt-daily.service' to apt-daily-upgrade.service.  But I think that
is too strict, because one may legitimately choose to disable only one of
the two services for some reason.

So I think this is something that you will want to fix in your image
mastering scripts.

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https://bugs.launchpad.net/bugs/1711428

Title:
  cloud-init sometimes fails on dpkg lock due to concurrent apt-daily-
  upgrade.service execution

Status in cloud-init:
  Incomplete
Status in apt package in Ubuntu:
  Incomplete

Bug description:
  This is the same problem as https://bugs.launchpad.net/cloud-
  init/+bug/1693361, but with a different APT invoking service.  In this
  case it is apt-daily-upgrade.service.

  So, I guess add apt-daily-upgrade.service to the Before line in
  /lib/systemd/system/cloud-final.service along side apt-daily.service.

  Or wait for an APT fix.  Or retry APT commands when executing
  "packages:"

  Reporting this to save someone else trouble, but I think we'll be
  rolling back to Trusty at this point.  Hopefully the B LTS will have
  an alternative to systemd.

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