Fixed in ubuntu2.
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https://bugs.launchpad.net/bugs/1686470
Title:
Apt updates that are uniformally spread across all timezones, with
predictable application windows
Status in apt package in Ubuntu:
Fix Committed
Status in unattended-upgrades package in Ubuntu:
Triaged
Status in apt source package in Xenial:
Triaged
Status in unattended-upgrades source package in Xenial:
Triaged
Status in apt source package in Yakkety:
Triaged
Status in unattended-upgrades source package in Yakkety:
Triaged
Status in apt source package in Zesty:
Triaged
Status in unattended-upgrades source package in Zesty:
Triaged
Status in apt source package in Artful:
Fix Committed
Status in unattended-upgrades source package in Artful:
Triaged
Bug description:
[ Impact ]
* unattended-upgrades are enabled by default in Ubuntu 16.04 and
later
* Currently the following three things happen as a monolithic event:
- metadata updates: apt update
- download of updates: apt upgrade --download-only
- application of updates: apt upgrade
* For the long running instances, all of the above happens at random
times throughout the day.
* If systems were poweredoff / suspended, this happens on boot /
resume
* End-users would like to have predictable timing, and control over when
the updates happen.
Considering all of the above, the following new behavior is proposed
which should address all concerns in question. It combines all the
desired properties from both end-user and mirror perspectives.
[ Proposed Default Behavior ]
* Decouple unattended-upgrades application, from apt update
* apt update:
- shall be a systemd timer based unit, triggered every 12h with a
random delay of 12h, therefore executed randomly twice a day.
- if unattened-upgrades (default on), or download-upgreadaeble-packages
are enabled, it should result in updates being downloaded aka
`apt upgrade --download-only`
* unattended-upgrades:
- shall be a separate systemd timer based unit triggered at 6am local
time with a random delay of 1h, therefore executed between 6am and
7am local time.
* On boot / resume:
- if we have missed one, or more, apt update timers,
apt update / download upgrades / unattended-upgrade will happen in
sequence. This may result in mirror spikes, but we do want to secure
cold/stale-booted systems as soon as possible.
[Test Case]
* Run system for more than 24h, and check that apt updates were
automatically executed twice.
* Check that unattended upgrades were triggered to be applied at
6am..7am window, if any.
* Poweroff the machine over the period when apt-get update was
scheduled, poweron and observe that apt-get update / download /
unattended upgrade are all performed on boot.
[Regression Potential]
* The newly proposed behavior is a mix of Pre-xenial behavior of "do
everything at 6am..6:30am window" and the xenial+ behavior of "do
everything at random times throughout the day". If there are specific
deployments that rely on the previous types of behaviour they will be
able to adjust manually the systemd timers with the overrides to be
executed exactly as they wish; or match the .0 release behaviour that
they preffer.
* If timers behavior is coded wrongly the proposed behaviour might not be
executed as intended, thus requiring further SRUs to bring us in-line
with the great expectations.
[Other Info]
* Related bug reports and history:
- bug #1615482
- bug #1554848
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