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Stateless Systems, Factory Reset, Golden Master Systems and Systemd Linuxcon Europe, Duesseldorf

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Stateless Systems, Factory Reset, Golden Master Systems and Systemd Linuxcon Europe, Duesseldorf Stateless Systems, Factory Reset, Golden Master Systems and systemd LinuxCon Europe, Duesseldorf October 2014 Stateless Systems, Factory Reset, Golden Master Systems and systemd The procedure to bring a system back into the state that is was shipped in. Factory Reset? Stateless Systems, Factory Reset, Golden Master Systems and systemd Factory Reset? The procedure to bring a system back into the state that is was shipped in. Stateless Systems, Factory Reset, Golden Master Systems and systemd A system where every single boot-up is as if a factory reset was just completed. Stateless System? Stateless Systems, Factory Reset, Golden Master Systems and systemd Stateless System? A system where every single boot-up is as if a factory reset was just completed. Stateless Systems, Factory Reset, Golden Master Systems and systemd The same image is usually shared between a multitude of systems. Golden Master? The one master image a factory reset returns the state to. Stateless Systems, Factory Reset, Golden Master Systems and systemd Golden Master? The one master image a factory reset returns the state to. The same image is usually shared between a multitude of systems. Stateless Systems, Factory Reset, Golden Master Systems and systemd Containers, servers, laptops/desktops/tablets, mobile, embedded Verifiable setups Apps Where do you want this? Stateless Systems, Factory Reset, Golden Master Systems and systemd servers, laptops/desktops/tablets, mobile, embedded Verifiable setups Apps Where do you want this? Containers, Stateless Systems, Factory Reset, Golden Master Systems and systemd laptops/desktops/tablets, mobile, embedded Verifiable setups Apps Where do you want this? Containers, servers, Stateless Systems, Factory Reset, Golden Master Systems and systemd mobile, embedded Verifiable setups Apps Where do you want this? Containers, servers, laptops/desktops/tablets, Stateless Systems, Factory Reset, Golden Master Systems and systemd embedded Verifiable setups Apps Where do you want this? Containers, servers, laptops/desktops/tablets, mobile, Stateless Systems, Factory Reset, Golden Master Systems and systemd Verifiable setups Apps Where do you want this? Containers, servers, laptops/desktops/tablets, mobile, embedded Stateless Systems, Factory Reset, Golden Master Systems and systemd Apps Where do you want this? Containers, servers, laptops/desktops/tablets, mobile, embedded Verifiable setups Stateless Systems, Factory Reset, Golden Master Systems and systemd Where do you want this? Containers, servers, laptops/desktops/tablets, mobile, embedded Verifiable setups Apps Stateless Systems, Factory Reset, Golden Master Systems and systemd Tons of prior art: Android, ChromeOS, CoreOS, virtualization infrastructure, and many embedded systems Stateless Systems, Factory Reset, Golden Master Systems and systemd Right in the OS itself. Our goal with working on this in the systemd context: to solve this in a modular and generic way, for all usecases Stateless Systems, Factory Reset, Golden Master Systems and systemd Our goal with working on this in the systemd context: to solve this in a modular and generic way, for all usecases Right in the OS itself. Stateless Systems, Factory Reset, Golden Master Systems and systemd /etc: configuration /var: state /usr: vendor OS resources (after the /usr merge) Let's seperate state from OS resources! Stateless Systems, Factory Reset, Golden Master Systems and systemd /var: state /usr: vendor OS resources (after the /usr merge) Let's seperate state from OS resources! /etc: configuration Stateless Systems, Factory Reset, Golden Master Systems and systemd /usr: vendor OS resources (after the /usr merge) Let's seperate state from OS resources! /etc: configuration /var: state Stateless Systems, Factory Reset, Golden Master Systems and systemd (after the /usr merge) Let's seperate state from OS resources! /etc: configuration /var: state /usr: vendor OS resources Stateless Systems, Factory Reset, Golden Master Systems and systemd Let's seperate state from OS resources! /etc: configuration /var: state /usr: vendor OS resources (after the /usr merge) Stateless Systems, Factory Reset, Golden Master Systems and systemd Flushing /etc, /var, just keeping /usr: full factory reset Flushing just /var, keeping /usr and /etc: keeping settings, but dropping collected state Stateless Systems, Factory Reset, Golden Master Systems and systemd Mostly just works, just a few more tmpfiles rules Booting with /var empty? Stateless Systems, Factory Reset, Golden Master Systems and systemd Booting with /var empty? Mostly just works, just a few more tmpfiles rules Stateless Systems, Factory Reset, Golden Master Systems and systemd Booting with /var empty? Mostly just works, just a few more tmpfiles rules Stateless Systems, Factory Reset, Golden Master Systems and systemd d /var 0755 - - - L /var/run - - - - ../run d /var/log 0755 - - - f /var/log/wtmp 0664 root utmp - f /var/log/btmp 0600 root utmp - d /var/cache 0755 - - - d /var/lib 0755 - - - d /var/spool 0755 - - - What's tmpfiles again? Stateless Systems, Factory Reset, Golden Master Systems and systemd What's tmpfiles again? d /var 0755 - - - L /var/run - - - - ../run d /var/log 0755 - - - f /var/log/wtmp 0664 root utmp - f /var/log/btmp 0600 root utmp - d /var/cache 0755 - - - d /var/lib 0755 - - - d /var/spool 0755 - - - Stateless Systems, Factory Reset, Golden Master Systems and systemd More complex Software is more allergic if configuration files in /etc are missing User database! Core OS components shipped by systemd are fixed Exception in the core OS: dbus, PAM Booting with /etc empty? Stateless Systems, Factory Reset, Golden Master Systems and systemd Software is more allergic if configuration files in /etc are missing User database! Core OS components shipped by systemd are fixed Exception in the core OS: dbus, PAM Booting with /etc empty? More complex Stateless Systems, Factory Reset, Golden Master Systems and systemd User database! Core OS components shipped by systemd are fixed Exception in the core OS: dbus, PAM Booting with /etc empty? More complex Software is more allergic if configuration files in /etc are missing Stateless Systems, Factory Reset, Golden Master Systems and systemd Core OS components shipped by systemd are fixed Exception in the core OS: dbus, PAM Booting with /etc empty? More complex Software is more allergic if configuration files in /etc are missing User database! Stateless Systems, Factory Reset, Golden Master Systems and systemd Exception in the core OS: dbus, PAM Booting with /etc empty? More complex Software is more allergic if configuration files in /etc are missing User database! Core OS components shipped by systemd are fixed Stateless Systems, Factory Reset, Golden Master Systems and systemd Booting with /etc empty? More complex Software is more allergic if configuration files in /etc are missing User database! Core OS components shipped by systemd are fixed Exception in the core OS: dbus, PAM Stateless Systems, Factory Reset, Golden Master Systems and systemd tmpfiles to the rescue: C /etc/pam.d C /etc/nsswitch.conf Introducing: /usr/share/factory/etc Stateless Systems, Factory Reset, Golden Master Systems and systemd sysusers to the rescue: u root 0 "Super User" /root u nobody 65534 "Nobody" - g adm - - - g wheel - - - g kmem - - - g lock - - - g tty 5 - - g utmp - - - g audio - - - g cdrom - - - g dialout - - - g disk - - - g input - - - g lp - - - g tape - - - g video - - - g users - - - Stateless Systems, Factory Reset, Golden Master Systems and systemd systemd-nspawn {volatile=state -b -D /srv/mycontainer systemd-nspawn {volatile=yes -b -D /srv/mycontainer systemd-nspawn {volatile=no -b -D /srv/mycontainer Stateless Systems, Factory Reset, Golden Master Systems and systemd systemd-nspawn {volatile=yes -b -D /srv/mycontainer systemd-nspawn {volatile=no -b -D /srv/mycontainer systemd-nspawn {volatile=state -b -D /srv/mycontainer Stateless Systems, Factory Reset, Golden Master Systems and systemd systemd-nspawn {volatile=no -b -D /srv/mycontainer systemd-nspawn {volatile=state -b -D /srv/mycontainer systemd-nspawn {volatile=yes -b -D /srv/mycontainer Stateless Systems, Factory Reset, Golden Master Systems and systemd /usr can be updated offline On next boot, /etc and /var are updated ConditionNeedsUpdate= ldconfig, sysusers, udev hwdb, . All atomic Updating Stateless Systems, Factory Reset, Golden Master Systems and systemd On next boot, /etc and /var are updated ConditionNeedsUpdate= ldconfig, sysusers, udev hwdb, . All atomic Updating /usr can be updated offline Stateless Systems, Factory Reset, Golden Master Systems and systemd ConditionNeedsUpdate= ldconfig, sysusers, udev hwdb, . All atomic Updating /usr can be updated offline On next boot, /etc and /var are updated Stateless Systems, Factory Reset, Golden Master Systems and systemd ldconfig, sysusers, udev hwdb, . All atomic Updating /usr can be updated offline On next boot, /etc and /var are updated ConditionNeedsUpdate= Stateless Systems, Factory Reset, Golden Master Systems and systemd All atomic Updating /usr can be updated offline On next boot, /etc and /var are updated ConditionNeedsUpdate= ldconfig, sysusers, udev hwdb, . Stateless Systems, Factory Reset, Golden Master Systems and systemd Updating /usr can be updated offline On next boot, /etc and /var are updated ConditionNeedsUpdate= ldconfig, sysusers, udev hwdb, . All atomic Stateless Systems, Factory Reset, Golden Master Systems and systemd Multiple /usr trees around! Double Buffering Stateless Systems, Factory Reset, Golden Master Systems and systemd Double Buffering
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