** Bug watch added: Debian Bug tracker #861357 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861357
** Also affects: apt (Debian) via http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861357 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1686470 Title: Apt updates that are uniformly spread across all timezones, with predictable application windows Status in apt package in Ubuntu: Fix Released 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 Released Status in unattended-upgrades source package in Artful: Triaged Status in apt package in Debian: Unknown 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1686470/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
