stateless systems, factory reset, golden master systems and
TRANSCRIPT
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Stateless Systems, Factory Reset, Golden MasterSystems and systemd
LinuxCon Europe, Duesseldorf
October 2014
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Factory Reset?
The procedure to bring a system back into the state that is wasshipped in.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Factory Reset?
The procedure to bring a system back into the state that is wasshipped in.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 4: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/4.jpg)
Stateless System?
A system where every single boot-up is as if a factory reset wasjust completed.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Stateless System?
A system where every single boot-up is as if a factory reset wasjust completed.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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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
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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
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Where do you want this?
Containers, servers, laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 9: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/9.jpg)
Where do you want this?
Containers,
servers, laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 10: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/10.jpg)
Where do you want this?
Containers, servers,
laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 11: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/11.jpg)
Where do you want this?
Containers, servers, laptops/desktops/tablets,
mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 12: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/12.jpg)
Where do you want this?
Containers, servers, laptops/desktops/tablets, mobile,
embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 13: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/13.jpg)
Where do you want this?
Containers, servers, laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 14: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/14.jpg)
Where do you want this?
Containers, servers, laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 15: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/15.jpg)
Where do you want this?
Containers, servers, laptops/desktops/tablets, mobile, embedded
Verifiable setups
Apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 16: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/16.jpg)
Tons of prior art: Android, ChromeOS, CoreOS, virtualizationinfrastructure, and many embedded systems
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Our goal with working on this in the systemd context: to solve thisin a modular and generic way, for all usecases
Right in the OS itself.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Our goal with working on this in the systemd context: to solve thisin a modular and generic way, for all usecases
Right in the OS itself.
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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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
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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
![Page 21: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/21.jpg)
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
![Page 22: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/22.jpg)
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
![Page 23: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/23.jpg)
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
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Flushing /etc, /var, just keeping /usr: full factory reset
Flushing just /var, keeping /usr and /etc: keeping settings, butdropping collected state
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Booting with /var empty?
Mostly just works, just a few more tmpfiles rules
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Booting with /var empty?
Mostly just works, just a few more tmpfiles rules
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 27: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/27.jpg)
Booting with /var empty?
Mostly just works, just a few more tmpfiles rules
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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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
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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
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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
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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
![Page 32: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/32.jpg)
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
![Page 33: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/33.jpg)
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
![Page 34: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/34.jpg)
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
![Page 35: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/35.jpg)
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
![Page 36: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/36.jpg)
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
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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
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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
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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
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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
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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
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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
![Page 43: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/43.jpg)
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
![Page 44: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/44.jpg)
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
![Page 45: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/45.jpg)
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
![Page 46: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/46.jpg)
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
![Page 47: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/47.jpg)
Double Buffering
Multiple /usr trees around!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Double Buffering
Multiple /usr trees around!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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RPM?
Classic Distributions?
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Timeframe?
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Apps!
/usr: os, runtime, framework
/opt/appname: app
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Apps!
/usr: os, runtime, framework
/opt/appname: app
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Apps!
/usr: os, runtime, framework
/opt/appname: app
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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OS: a /usr one can boot up a system with
Runtime: a /usr one can run executables against
Framework: a /usr one can build executables with
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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OS: a /usr one can boot up a system with
Runtime: a /usr one can run executables against
Framework: a /usr one can build executables with
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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OS: a /usr one can boot up a system with
Runtime: a /usr one can run executables against
Framework: a /usr one can build executables with
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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OS, Runtime, Framework, Instance, Apps
All in multiple versions on the same system
btrfs subvolumes
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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OS, Runtime, Framework, Instance, Apps
All in multiple versions on the same system
btrfs subvolumes
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 59: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/59.jpg)
OS, Runtime, Framework, Instance, Apps
All in multiple versions on the same system
btrfs subvolumes
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 60: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/60.jpg)
btrfs???
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 65: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/65.jpg)
Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Clear naming Scheme for subvolumes
usr:vendorid:architecture:version
root:name:vendorid:architecture
runtime:vendorid:architecture:version
framework:vendorid:architecture:version
app:vendorid:runtime:architecture:version
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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Namespaces!
Dynamic views on the system, for containers and apps
Multiple root subvolumes sharing the same usr subvolume!
Multiple app subvolumes sharing the same runtime subvolume!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 68: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/68.jpg)
Namespaces!
Dynamic views on the system, for containers and apps
Multiple root subvolumes sharing the same usr subvolume!
Multiple app subvolumes sharing the same runtime subvolume!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 69: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/69.jpg)
Namespaces!
Dynamic views on the system, for containers and apps
Multiple root subvolumes sharing the same usr subvolume!
Multiple app subvolumes sharing the same runtime subvolume!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 70: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/70.jpg)
Namespaces!
Dynamic views on the system, for containers and apps
Multiple root subvolumes sharing the same usr subvolume!
Multiple app subvolumes sharing the same runtime subvolume!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 71: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/71.jpg)
Delivery:
btrfs send/recv deltas via http
Same for OS, runtimes, frameworks and apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 72: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/72.jpg)
Delivery:
btrfs send/recv deltas via http
Same for OS, runtimes, frameworks and apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 73: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/73.jpg)
Delivery:
btrfs send/recv deltas via http
Same for OS, runtimes, frameworks and apps
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 74: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/74.jpg)
OS installation:
1 Create GPT table with ESP + btrfs
2 Deserialize usr tree into btrfs
3 Install bootloader into ESP
4 Profit!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 75: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/75.jpg)
OS installation:
1 Create GPT table with ESP + btrfs
2 Deserialize usr tree into btrfs
3 Install bootloader into ESP
4 Profit!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 76: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/76.jpg)
OS installation:
1 Create GPT table with ESP + btrfs
2 Deserialize usr tree into btrfs
3 Install bootloader into ESP
4 Profit!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 77: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/77.jpg)
OS installation:
1 Create GPT table with ESP + btrfs
2 Deserialize usr tree into btrfs
3 Install bootloader into ESP
4 Profit!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 78: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/78.jpg)
OS installation:
1 Create GPT table with ESP + btrfs
2 Deserialize usr tree into btrfs
3 Install bootloader into ESP
4 Profit!
Stateless Systems, Factory Reset, Golden Master Systems and systemd
![Page 79: Stateless Systems, Factory Reset, Golden Master Systems and](https://reader034.vdocuments.us/reader034/viewer/2022042619/5870a8831a28ab31318b58bb/html5/thumbnails/79.jpg)
http://0pointer.net/blog/projects/stateless.html
http://0pointer.net/blog/
revisiting-how-we-put-together-linux-systems.html
Stateless Systems, Factory Reset, Golden Master Systems and systemd
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That’s all, folks!
Stateless Systems, Factory Reset, Golden Master Systems and systemd