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--- ---
title: Users, Groups, UIDs and GIDs on `systemd` Systems title: Users, Groups, UIDs and GIDs on systemd Systems
category: Concepts category: Concepts
layout: default layout: default
--- ---
# Users, Groups, UIDs and GIDs on `systemd` Systems # Users, Groups, UIDs and GIDs on systemd Systems
Here's a summary of the requirements `systemd` (and Linux) make on UID/GID Here's a summary of the requirements `systemd` (and Linux) make on UID/GID
assignments and their ranges. assignments and their ranges.

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Other parts include a logging daemon, utilities to control basic system configuration like the hostname, date, locale, maintain a list of logged-in users and running containers and virtual machines, system accounts, runtime directories and settings, and daemons to manage simple network configuration, network time synchronization, log forwarding, and name resolution. Other parts include a logging daemon, utilities to control basic system configuration like the hostname, date, locale, maintain a list of logged-in users and running containers and virtual machines, system accounts, runtime directories and settings, and daemons to manage simple network configuration, network time synchronization, log forwarding, and name resolution.
See the introductory blog story and three status updates for a longer introduction. Also see the [Wikipedia article](https://en.wikipedia.org/wiki/systemd).
--- ---
{% assign by_category = site.pages | group_by:"category" %} {% assign by_category = site.pages | group_by:"category" %}
@ -24,3 +22,72 @@ See the introductory blog story and three status updates for a longer introducti
{% endif %} {% endif %}
{% endfor %} {% endfor %}
## See also
* [Introductory blog story](http://0pointer.de/blog/projects/systemd.html)
* [Three](http://0pointer.de/blog/projects/systemd-update.html) [status](http://0pointer.de/blog/projects/systemd-update-2.html) [updates](http://0pointer.de/blog/projects/systemd-update-3.html)
* The [Wikipedia article](https://en.wikipedia.org/wiki/systemd).
<pre style="float:right; color:white; background-color:black; font-size:smaller; width:45%; padding:6pt 8pt">
Welcome to <span style="color:blue">Fedora 20 (Heisenbug)</span>!
[ <span style="color:green">OK</span> ] Reached target Remote File Systems.
[ <span style="color:green">OK</span> ] Listening on Delayed Shutdown Socket.
[ <span style="color:green">OK</span> ] Listening on /dev/initctl Compatibility Named Pipe.
[ <span style="color:green">OK</span> ] Reached target Paths.
[ <span style="color:green">OK</span> ] Reached target Encrypted Volumes.
[ <span style="color:green">OK</span> ] Listening on Journal Socket.
Mounting Huge Pages File System...
Mounting POSIX Message Queue File System...
Mounting Debug File System...
Starting Journal Service...
[ <span style="color:green">OK</span> ] Started Journal Service.
Mounting Configuration File System...
Mounting FUSE Control File System...
[ <span style="color:green">OK</span> ] Created slice Root Slice.
[ <span style="color:green">OK</span> ] Created slice User and Session Slice.
[ <span style="color:green">OK</span> ] Created slice System Slice.
[ <span style="color:green">OK</span> ] Reached target Slices.
[ <span style="color:green">OK</span> ] Reached target Swap.
Mounting Temporary Directory...
[ <span style="color:green">OK</span> ] Reached target Local File Systems (Pre).
Starting Load Random Seed...
Starting Load/Save Random Seed...
[ <span style="color:green">OK</span> ] Mounted Huge Pages File System.
[ <span style="color:green">OK</span> ] Mounted POSIX Message Queue File System.
[ <span style="color:green">OK</span> ] Mounted Debug File System.
[ <span style="color:green">OK</span> ] Mounted Configuration File System.
[ <span style="color:green">OK</span> ] Mounted FUSE Control File System.
[ <span style="color:green">OK</span> ] Mounted Temporary Directory.
[ <span style="color:green">OK</span> ] Started Load Random Seed.
[ <span style="color:green">OK</span> ] Started Load/Save Random Seed.
[ <span style="color:green">OK</span> ] Reached target Local File Systems.
Starting Recreate Volatile Files and Directories...
Starting Trigger Flushing of Journal to Persistent Storage...
[ <span style="color:green">OK</span> ] Started Recreate Volatile Files and Directories.
Starting Update UTMP about System Reboot/Shutdown...
[ <span style="color:green">OK</span> ] Started Trigger Flushing of Journal to Persistent Storage.
[ <span style="color:green">OK</span> ] Started Update UTMP about System Reboot/Shutdown.
[ <span style="color:green">OK</span> ] Reached target System Initialization.
[ <span style="color:green">OK</span> ] Reached target Timers.
[ <span style="color:green">OK</span> ] Listening on D-Bus System Message Bus Socket.
[ <span style="color:green">OK</span> ] Reached target Sockets.
[ <span style="color:green">OK</span> ] Reached target Basic System.
Starting Permit User Sessions...
Starting D-Bus System Message Bus...
[ <span style="color:green">OK</span> ] Started D-Bus System Message Bus.
Starting Login Service...
Starting Cleanup of Temporary Directories...
[ <span style="color:green">OK</span> ] Started Permit User Sessions.
[ <span style="color:green">OK</span> ] Started Cleanup of Temporary Directories.
Starting Console Getty...
[ <span style="color:green">OK</span> ] Started Console Getty.
[ <span style="color:green">OK</span> ] Reached target Login Prompts.
[ <span style="color:green">OK</span> ] Started Login Service.
[ <span style="color:green">OK</span> ] Reached target Multi-User System.
Fedora release 20 (Heisenbug)
Kernel 3.9.2-200.fc18.x86_64 on an x86_64 (console)
fedora login:
</pre>

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Control Group Interfaces</ulink> for an introduction on how to make Control Group Interfaces</ulink> for an introduction on how to make
use of scope units from programs.</para> use of scope units from programs.</para>
<para>Note that unlike service units scope units have no "main" process, all processes in the scope are <para>Note that, unlike service units, scope units have no "main" process: all processes in the scope are
equivalent. The lifecycle of the scope unit is thus not bound to the lifetime of one specific process but equivalent. The lifecycle of the scope unit is thus not bound to the lifetime of one specific process,
to the existance of any processes in the scope. This also means that the exit status of these processes but to the existence of at least one process in the scope. This also means that the exit statuses of
do not cause the scope unit to enter a failure state. Scope units may still enter a failure state, for these processes are not relevant for the scope unit failure state. Scope units may still enter a failure
example due to resource exhaustion or stop timeouts being reached, but not due to programs inside of them state, for example due to resource exhaustion or stop timeouts being reached, but not due to programs
terminating uncleanly. Since processes managed as scope units generally remain children of the original inside of them terminating uncleanly. Since processes managed as scope units generally remain children of
process that forked them off it's also the job of that process to collect their exit statuses and act on the original process that forked them off, it is also the job of that process to collect their exit
them as needed.</para> statuses and act on them as needed.</para>
</refsect1> </refsect1>
<refsect1> <refsect1>