Tout a fait !
Si j'ai bien compris, il y a 6 fichiers importants pour les mises à jour automatiques sous Ubuntu et probablement Debian :
- apt-daily.timer / apt-daily.service : lance toutes les 12 heures, après un temps d'attente aléatoire variant de 0 à 12h la vérifications de présence de mises à jour. Dans le passé, c'était une fois par jour, la nuit a 6h25 après un temps d'attente variant de 0 à 30 minutes. Par contre, il ne va pas vérifier deux fois dans la même journée les paquets.
- apt-daily-upgrade.timer / apt-daily-upgrade.service : Lance l'upgrade proposent dit et le reboot si c'est configuré comme ça. Le llancement se fait a 6h00 + une attente aléatoire variant de 0 à 60 minutes.
- /etc/apt/apt.conf.d/10periodic : Autorise la mise à jour des paquets permettant de voir si une mise à jour est disponible, le téléchargement de la mise à jour proprement dite et l'installation.
- /etc/apt/apt.conf.d/50unattended-upgrades : Indique si cela ne concerne que les mises à jour de sécurité ou toutes les mises à jour disponibles. C'est aussi là qu'on précise les options pour supprimer les anciens noyaux et si on souhaite un reboot après la mise à jour.
/lib/systemd/system/apt-daily.timer :
[Unit]
Description=Daily apt download activities
[Timer]
OnCalendar=*-*-* 6,18:00
RandomizedDelaySec=12h
Persistent=true
[Install]
WantedBy=timers.target
/lib/systemd/system/apt-daily.service :
[Unit]
Description=Daily apt download activities
Documentation=man:apt(8)
ConditionACPower=true
After=network.target network-online.target systemd-networkd.service NetworkMana$
[Service]
Type=oneshot
ExecStartPre=-/usr/lib/apt/apt-helper wait-online
ExecStart=/usr/lib/apt/apt.systemd.daily update
/lib/systemd/system/apt-daily-upgrade.timer :
[Unit]
Description=Daily apt upgrade and clean activities
After=apt-daily.timer
[Timer]
OnCalendar=*-*-* 6:00
RandomizedDelaySec=60m
Persistent=true
[Install]
WantedBy=timers.target
/lib/systemd/system/apt-daily-upgrade.service :
[Unit]
Description=Daily apt upgrade and clean activities
Documentation=man:apt(8)
ConditionACPower=true
After=apt-daily.service
[Service]
Type=oneshot
ExecStart=/usr/lib/apt/apt.systemd.daily install
KillMode=process
TimeoutStopSec=900
/etc/apt/apt.conf.d/10periodic :
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "0";
/etc/apt/apt.conf.d/50unattended-upgrades :
// Automatically upgrade packages from these (origin:archive) pairs
//
// Note that in Ubuntu security updates may pull in new dependencies
// from non-security sources (e.g. chromium). By allowing the release
// pocket these get automatically pulled in.
Unattended-Upgrade::Allowed-Origins {
"${distro_id}:${distro_codename}";
"${distro_id}:${distro_codename}-security";
// Extended Security Maintenance; doesn't necessarily exist for
// every release and this system may not have it installed, but if
// available, the policy for updates is such that unattended-upgrades
// should also install from here by default.
"${distro_id}ESM:${distro_codename}";
// "${distro_id}:${distro_codename}-updates";
// "${distro_id}:${distro_codename}-proposed";
// "${distro_id}:${distro_codename}-backports";
};
// List of packages to not update (regexp are supported)
Unattended-Upgrade::Package-Blacklist {
// "vim";
// "libc6";
// "libc6-dev";
// "libc6-i686";
};
// This option will controls whether the development release of Ubuntu will be
// upgraded automatically.
Unattended-Upgrade::DevRelease "false";
// This option allows you to control if on a unclean dpkg exit
// unattended-upgrades will automatically run
// dpkg --force-confold --configure -a
// The default is true, to ensure updates keep getting installed
//Unattended-Upgrade::AutoFixInterruptedDpkg "false";
// Split the upgrade into the smallest possible chunks so that
// they can be interrupted with SIGTERM. This makes the upgrade
// a bit slower but it has the benefit that shutdown while a upgrade
// is running is possible (with a small delay)
//Unattended-Upgrade::MinimalSteps "false";
// Install all unattended-upgrades when the machine is shutting down
// instead of doing it in the background while the machine is running
// This will (obviously) make shutdown slower
//Unattended-Upgrade::InstallOnShutdown "true";
// Send email to this address for problems or packages upgrades
// If empty or unset then no email is sent, make sure that you
// have a working mail setup on your system. A package that provides
// 'mailx' must be installed. E.g. "user@example.com"
//Unattended-Upgrade::Mail "root";
// Set this value to "true" to get emails only on errors. Default
// is to always send a mail if Unattended-Upgrade::Mail is set
//Unattended-Upgrade::MailOnlyOnError "true";
// Do automatic removal of new unused dependencies after the upgrade
// (equivalent to apt-get autoremove)
//Unattended-Upgrade::Remove-Unused-Dependencies "false";
// Automatically reboot *WITHOUT CONFIRMATION*
// if the file /var/run/reboot-required is found after the upgrade
//Unattended-Upgrade::Automatic-Reboot "false";
// If automatic reboot is enabled and needed, reboot at the specific
// time instead of immediately
// Default: "now"
//Unattended-Upgrade::Automatic-Reboot-Time "02:00";
// Use apt bandwidth limit feature, this example limits the download
// speed to 70kb/sec
//Acquire::http::Dl-Limit "70";
// Enable logging to syslog. Default is False
// Unattended-Upgrade::SyslogEnable "false";
// Specify syslog facility. Default is daemon
// Unattended-Upgrade::SyslogFacility "daemon";