mirror of
https://github.com/systemd/systemd.git
synced 2024-11-05 06:52:22 +03:00
d2acdcc646
We had "SYSTEM MANAGER DIRECTIVES" which was a misnomer already, because it also listed user manager stuff. Let's make this a more general section and move the items for other services there too (from "MISCELANENOUS").
386 lines
20 KiB
XML
386 lines
20 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
|
|
<!ENTITY % entities SYSTEM "custom-entities.ent" >
|
|
%entities;
|
|
]>
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
-->
|
|
|
|
<refentry id="systemd-system.conf"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
<refentryinfo>
|
|
<title>systemd-system.conf</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-system.conf</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-system.conf</refname>
|
|
<refname>system.conf.d</refname>
|
|
<refname>systemd-user.conf</refname>
|
|
<refname>user.conf.d</refname>
|
|
<refpurpose>System and session service manager configuration files</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>/etc/systemd/system.conf</filename>,
|
|
<filename>/etc/systemd/system.conf.d/*.conf</filename>,
|
|
<filename>/run/systemd/system.conf.d/*.conf</filename>,
|
|
<filename>/usr/lib/systemd/system.conf.d/*.conf</filename></para>
|
|
<para><filename>/etc/systemd/user.conf</filename>,
|
|
<filename>/etc/systemd/user.conf.d/*.conf</filename>,
|
|
<filename>/run/systemd/user.conf.d/*.conf</filename>,
|
|
<filename>/usr/lib/systemd/user.conf.d/*.conf</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>When run as a system instance, systemd interprets the
|
|
configuration file <filename>system.conf</filename> and the files
|
|
in <filename>system.conf.d</filename> directories; when run as a
|
|
user instance, systemd interprets the configuration file
|
|
<filename>user.conf</filename> and the files in
|
|
<filename>user.conf.d</filename> directories. These configuration
|
|
files contain a few settings controlling basic manager
|
|
operations. See
|
|
<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for a general description of the syntax.</para>
|
|
</refsect1>
|
|
|
|
<xi:include href="standard-conf.xml" xpointer="main-conf" />
|
|
|
|
<refsect1>
|
|
<title>Options</title>
|
|
|
|
<para>All options are configured in the
|
|
<literal>[Manager]</literal> section:</para>
|
|
|
|
<variablelist class='config-directives'>
|
|
|
|
<varlistentry>
|
|
<term><varname>LogLevel=</varname></term>
|
|
<term><varname>LogTarget=</varname></term>
|
|
<term><varname>LogColor=</varname></term>
|
|
<term><varname>LogLocation=</varname></term>
|
|
<term><varname>DumpCore=yes</varname></term>
|
|
<term><varname>CrashChangeVT=no</varname></term>
|
|
<term><varname>CrashShell=no</varname></term>
|
|
<term><varname>CrashReboot=no</varname></term>
|
|
<term><varname>ShowStatus=yes</varname></term>
|
|
<term><varname>DefaultStandardOutput=journal</varname></term>
|
|
<term><varname>DefaultStandardError=inherit</varname></term>
|
|
|
|
<listitem><para>Configures various parameters of basic manager operation. These options may be overridden by
|
|
the respective process and kernel command line arguments. See
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> for
|
|
details.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CtrlAltDelBurstAction=</varname></term>
|
|
|
|
<listitem><para>Defines what action will be performed
|
|
if user presses Ctrl-Alt-Delete more than 7 times in 2s.
|
|
Can be set to <literal>reboot-force</literal>, <literal>poweroff-force</literal>,
|
|
<literal>reboot-immediate</literal>, <literal>poweroff-immediate</literal>
|
|
or disabled with <literal>none</literal>. Defaults to
|
|
<literal>reboot-force</literal>.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CPUAffinity=</varname></term>
|
|
|
|
<listitem><para>Configures the CPU affinity for the service manager as well as the default CPU affinity for all
|
|
forked off processes. Takes a list of CPU indices or ranges separated by either whitespace or commas. CPU
|
|
ranges are specified by the lower and upper CPU indices separated by a dash. Individual services may override
|
|
the CPU affinity for their processes with the <varname>CPUAffinity=</varname> setting in unit files, see
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>RuntimeWatchdogSec=</varname></term>
|
|
<term><varname>ShutdownWatchdogSec=</varname></term>
|
|
|
|
<listitem><para>Configure the hardware watchdog at runtime and at reboot. Takes a timeout value in seconds (or
|
|
in other time units if suffixed with <literal>ms</literal>, <literal>min</literal>, <literal>h</literal>,
|
|
<literal>d</literal>, <literal>w</literal>). If <varname>RuntimeWatchdogSec=</varname> is set to a non-zero
|
|
value, the watchdog hardware (<filename>/dev/watchdog</filename> or the path specified with
|
|
<varname>WatchdogDevice=</varname> or the kernel option <varname>systemd.watchdog-device=</varname>) will be
|
|
programmed to automatically reboot the system if it is not contacted within the specified timeout interval. The
|
|
system manager will ensure to contact it at least once in half the specified timeout interval. This feature
|
|
requires a hardware watchdog device to be present, as it is commonly the case in embedded and server
|
|
systems. Not all hardware watchdogs allow configuration of all possible reboot timeout values, in which case
|
|
the closest available timeout is picked. <varname>ShutdownWatchdogSec=</varname> may be used to configure the
|
|
hardware watchdog when the system is asked to reboot. It works as a safety net to ensure that the reboot takes
|
|
place even if a clean reboot attempt times out. Note that the <varname>ShutdownWatchdogSec=</varname> timeout
|
|
applies only to the second phase of the reboot, i.e. after all regular services are already terminated, and
|
|
after the system and service manager process (PID 1) got replaced by the <filename>systemd-shutdown</filename>
|
|
binary, see system <citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for details. During the first phase of the shutdown operation the system and service manager remains running
|
|
and hence <varname>RuntimeWatchdogSec=</varname> is still honoured. In order to define a timeout on this first
|
|
phase of system shutdown, configure <varname>JobTimeoutSec=</varname> and <varname>JobTimeoutAction=</varname>
|
|
in the <literal>[Unit]</literal> section of the <filename>shutdown.target</filename> unit. By default
|
|
<varname>RuntimeWatchdogSec=</varname> defaults to 0 (off), and <varname>ShutdownWatchdogSec=</varname> to
|
|
10min. These settings have no effect if a hardware watchdog is not available.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>WatchdogDevice=</varname></term>
|
|
|
|
<listitem><para>Configure the hardware watchdog device that the
|
|
runtime and shutdown watchdog timers will open and use. Defaults
|
|
to <filename>/dev/watchdog</filename>. This setting has no
|
|
effect if a hardware watchdog is not available.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CapabilityBoundingSet=</varname></term>
|
|
|
|
<listitem><para>Controls which capabilities to include in the
|
|
capability bounding set for PID 1 and its children. See
|
|
<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for details. Takes a whitespace-separated list of capability
|
|
names as read by
|
|
<citerefentry project='mankier'><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
|
|
Capabilities listed will be included in the bounding set, all
|
|
others are removed. If the list of capabilities is prefixed
|
|
with ~, all but the listed capabilities will be included, the
|
|
effect of the assignment inverted. Note that this option also
|
|
affects the respective capabilities in the effective,
|
|
permitted and inheritable capability sets. The capability
|
|
bounding set may also be individually configured for units
|
|
using the <varname>CapabilityBoundingSet=</varname> directive
|
|
for units, but note that capabilities dropped for PID 1 cannot
|
|
be regained in individual units, they are lost for
|
|
good.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>NoNewPrivileges=</varname></term>
|
|
|
|
<listitem><para>Takes a boolean argument. If true, ensures that PID 1
|
|
and all its children can never gain new privileges through
|
|
<citerefentry project='man-pages'><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>
|
|
(e.g. via setuid or setgid bits, or filesystem capabilities).
|
|
Defaults to false. General purpose distributions commonly rely
|
|
on executables with setuid or setgid bits and will thus not
|
|
function properly with this option enabled. Individual units
|
|
cannot disable this option.
|
|
Also see <ulink url="https://www.kernel.org/doc/html/latest/userspace-api/no_new_privs.html">No New Privileges Flag</ulink>.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SystemCallArchitectures=</varname></term>
|
|
|
|
<listitem><para>Takes a space-separated list of architecture
|
|
identifiers. Selects from which architectures system calls may
|
|
be invoked on this system. This may be used as an effective
|
|
way to disable invocation of non-native binaries system-wide,
|
|
for example to prohibit execution of 32-bit x86 binaries on
|
|
64-bit x86-64 systems. This option operates system-wide, and
|
|
acts similar to the
|
|
<varname>SystemCallArchitectures=</varname> setting of unit
|
|
files, see
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details. This setting defaults to the empty list, in which
|
|
case no filtering of system calls based on architecture is
|
|
applied. Known architecture identifiers are
|
|
<literal>x86</literal>, <literal>x86-64</literal>,
|
|
<literal>x32</literal>, <literal>arm</literal> and the special
|
|
identifier <literal>native</literal>. The latter implicitly
|
|
maps to the native architecture of the system (or more
|
|
specifically, the architecture the system manager was compiled
|
|
for). Set this setting to <literal>native</literal> to
|
|
prohibit execution of any non-native binaries. When a binary
|
|
executes a system call of an architecture that is not listed
|
|
in this setting, it will be immediately terminated with the
|
|
SIGSYS signal.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>TimerSlackNSec=</varname></term>
|
|
|
|
<listitem><para>Sets the timer slack in nanoseconds for PID 1,
|
|
which is inherited by all executed processes, unless
|
|
overridden individually, for example with the
|
|
<varname>TimerSlackNSec=</varname> setting in service units
|
|
(for details see
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
|
|
The timer slack controls the accuracy of wake-ups triggered by
|
|
system timers. See
|
|
<citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
|
|
for more information. Note that in contrast to most other time
|
|
span definitions this parameter takes an integer value in
|
|
nano-seconds if no unit is specified. The usual time units are
|
|
understood too.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultTimerAccuracySec=</varname></term>
|
|
|
|
<listitem><para>Sets the default accuracy of timer units. This
|
|
controls the global default for the
|
|
<varname>AccuracySec=</varname> setting of timer units, see
|
|
<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details. <varname>AccuracySec=</varname> set in individual
|
|
units override the global default for the specific unit.
|
|
Defaults to 1min. Note that the accuracy of timer units is
|
|
also affected by the configured timer slack for PID 1, see
|
|
<varname>TimerSlackNSec=</varname> above.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultTimeoutStartSec=</varname></term>
|
|
<term><varname>DefaultTimeoutStopSec=</varname></term>
|
|
<term><varname>DefaultRestartSec=</varname></term>
|
|
|
|
<listitem><para>Configures the default timeouts for starting
|
|
and stopping of units, as well as the default time to sleep
|
|
between automatic restarts of units, as configured per-unit in
|
|
<varname>TimeoutStartSec=</varname>,
|
|
<varname>TimeoutStopSec=</varname> and
|
|
<varname>RestartSec=</varname> (for services, see
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details on the per-unit settings). Disabled by default, when
|
|
service with <varname>Type=oneshot</varname> is used.
|
|
For non-service units,
|
|
<varname>DefaultTimeoutStartSec=</varname> sets the default
|
|
<varname>TimeoutSec=</varname>
|
|
value. <varname>DefaultTimeoutStartSec=</varname> and
|
|
<varname>DefaultTimeoutStopSec=</varname> default to
|
|
90s. <varname>DefaultRestartSec=</varname> defaults to
|
|
100ms.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultStartLimitIntervalSec=</varname></term>
|
|
<term><varname>DefaultStartLimitBurst=</varname></term>
|
|
|
|
<listitem><para>Configure the default unit start rate
|
|
limiting, as configured per-service by
|
|
<varname>StartLimitIntervalSec=</varname> and
|
|
<varname>StartLimitBurst=</varname>. See
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details on the per-service settings.
|
|
<varname>DefaultStartLimitIntervalSec=</varname> defaults to
|
|
10s. <varname>DefaultStartLimitBurst=</varname> defaults to
|
|
5.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultEnvironment=</varname></term>
|
|
|
|
<listitem><para>Sets manager environment variables passed to
|
|
all executed processes. Takes a space-separated list of
|
|
variable assignments. See
|
|
<citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for details about environment variables.</para>
|
|
|
|
<para>Example:
|
|
|
|
<programlisting>DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
|
|
|
|
Sets three variables
|
|
<literal>VAR1</literal>,
|
|
<literal>VAR2</literal>,
|
|
<literal>VAR3</literal>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultCPUAccounting=</varname></term>
|
|
<term><varname>DefaultBlockIOAccounting=</varname></term>
|
|
<term><varname>DefaultMemoryAccounting=</varname></term>
|
|
<term><varname>DefaultTasksAccounting=</varname></term>
|
|
<term><varname>DefaultIOAccounting=</varname></term>
|
|
<term><varname>DefaultIPAccounting=</varname></term>
|
|
|
|
<listitem><para>Configure the default resource accounting settings, as configured per-unit by
|
|
<varname>CPUAccounting=</varname>, <varname>BlockIOAccounting=</varname>, <varname>MemoryAccounting=</varname>,
|
|
<varname>TasksAccounting=</varname>, <varname>IOAccounting=</varname> and <varname>IPAccounting=</varname>. See
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details on the per-unit settings. <varname>DefaultTasksAccounting=</varname> defaults to yes,
|
|
<varname>DefaultMemoryAccounting=</varname> to &MEMORY_ACCOUNTING_DEFAULT;. <varname>DefaultCPUAccounting=</varname>
|
|
defaults to yes if enabling CPU accounting doesn't require the CPU controller to be enabled (Linux 4.15+ using the
|
|
unified hierarchy for resource control), otherwise it defaults to no. The other three settings default to no.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultTasksMax=</varname></term>
|
|
|
|
<listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details. This setting applies to all unit types that support resource control settings, with the exception
|
|
of slice units. Defaults to 15%, which equals 4915 with the kernel's defaults on the host, but might be smaller
|
|
in OS containers.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultLimitCPU=</varname></term>
|
|
<term><varname>DefaultLimitFSIZE=</varname></term>
|
|
<term><varname>DefaultLimitDATA=</varname></term>
|
|
<term><varname>DefaultLimitSTACK=</varname></term>
|
|
<term><varname>DefaultLimitCORE=</varname></term>
|
|
<term><varname>DefaultLimitRSS=</varname></term>
|
|
<term><varname>DefaultLimitNOFILE=</varname></term>
|
|
<term><varname>DefaultLimitAS=</varname></term>
|
|
<term><varname>DefaultLimitNPROC=</varname></term>
|
|
<term><varname>DefaultLimitMEMLOCK=</varname></term>
|
|
<term><varname>DefaultLimitLOCKS=</varname></term>
|
|
<term><varname>DefaultLimitSIGPENDING=</varname></term>
|
|
<term><varname>DefaultLimitMSGQUEUE=</varname></term>
|
|
<term><varname>DefaultLimitNICE=</varname></term>
|
|
<term><varname>DefaultLimitRTPRIO=</varname></term>
|
|
<term><varname>DefaultLimitRTTIME=</varname></term>
|
|
|
|
<listitem><para>These settings control various default
|
|
resource limits for units. See
|
|
<citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
|
|
for details. The resource limit is possible to specify in two formats,
|
|
<option>value</option> to set soft and hard limits to the same value,
|
|
or <option>soft:hard</option> to set both limits individually (e.g. DefaultLimitAS=4G:16G).
|
|
Use the string <varname>infinity</varname> to
|
|
configure no limit on a specific resource. The multiplicative
|
|
suffixes K (=1024), M (=1024*1024) and so on for G, T, P and E
|
|
may be used for resource limits measured in bytes
|
|
(e.g. DefaultLimitAS=16G). For the limits referring to time values,
|
|
the usual time units ms, s, min, h and so on may be used (see
|
|
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for details). Note that if no time unit is specified for
|
|
<varname>DefaultLimitCPU=</varname> the default unit of seconds is
|
|
implied, while for <varname>DefaultLimitRTTIME=</varname> the default
|
|
unit of microseconds is implied. Also, note that the effective
|
|
granularity of the limits might influence their
|
|
enforcement. For example, time limits specified for
|
|
<varname>DefaultLimitCPU=</varname> will be rounded up implicitly to
|
|
multiples of 1s. These settings may be overridden in individual units
|
|
using the corresponding LimitXXX= directives. Note that these resource
|
|
limits are only defaults for units, they are not applied to PID 1
|
|
itself.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|