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65224c1d0e
This option is only used on reboot, not on other types of shutdown modes, so it is misleading. Keep the old name working for backward compatibility, but remove it from the documentation.
437 lines
24 KiB
XML
437 lines
24 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="systemd-system.conf"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-system.conf</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-system.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-system.conf</refname>
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<refname>system.conf.d</refname>
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<refname>systemd-user.conf</refname>
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<refname>user.conf.d</refname>
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<refpurpose>System and session service manager configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/system.conf</filename>,
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<filename>/etc/systemd/system.conf.d/*.conf</filename>,
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<filename>/run/systemd/system.conf.d/*.conf</filename>,
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<filename>/usr/lib/systemd/system.conf.d/*.conf</filename></para>
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<para><filename>/etc/systemd/user.conf</filename>,
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<filename>/etc/systemd/user.conf.d/*.conf</filename>,
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<filename>/run/systemd/user.conf.d/*.conf</filename>,
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<filename>/usr/lib/systemd/user.conf.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>When run as a system instance, systemd interprets the
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configuration file <filename>system.conf</filename> and the files
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in <filename>system.conf.d</filename> directories; when run as a
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user instance, systemd interprets the configuration file
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<filename>user.conf</filename> and the files in
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<filename>user.conf.d</filename> directories. These configuration
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files contain a few settings controlling basic manager
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operations. See
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for a general description of the syntax.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>Options</title>
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<para>All options are configured in the
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<literal>[Manager]</literal> section:</para>
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<variablelist class='config-directives'>
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<varlistentry>
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<term><varname>LogLevel=</varname></term>
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<term><varname>LogTarget=</varname></term>
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<term><varname>LogColor=</varname></term>
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<term><varname>LogLocation=</varname></term>
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<term><varname>DumpCore=yes</varname></term>
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<term><varname>CrashChangeVT=no</varname></term>
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<term><varname>CrashShell=no</varname></term>
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<term><varname>CrashReboot=no</varname></term>
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<term><varname>ShowStatus=yes</varname></term>
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<term><varname>DefaultStandardOutput=journal</varname></term>
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<term><varname>DefaultStandardError=inherit</varname></term>
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<listitem><para>Configures various parameters of basic manager operation. These options may be overridden by
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the respective process and kernel command line arguments. See
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> for
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details.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>CtrlAltDelBurstAction=</varname></term>
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<listitem><para>Defines what action will be performed
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if user presses Ctrl-Alt-Delete more than 7 times in 2s.
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Can be set to <literal>reboot-force</literal>, <literal>poweroff-force</literal>,
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<literal>reboot-immediate</literal>, <literal>poweroff-immediate</literal>
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or disabled with <literal>none</literal>. Defaults to
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<literal>reboot-force</literal>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>CPUAffinity=</varname></term>
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<listitem><para>Configures the CPU affinity for the service manager as well as the default CPU
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affinity for all forked off processes. Takes a list of CPU indices or ranges separated by either
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whitespace or commas. CPU ranges are specified by the lower and upper CPU indices separated by a
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dash. This option may be specified more than once, in which case the specified CPU affinity masks are
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merged. If the empty string is assigned, the mask is reset, all assignments prior to this will have
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no effect. Individual services may override the CPU affinity for their processes with the
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<varname>CPUAffinity=</varname> setting in unit files, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NUMAPolicy=</varname></term>
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<listitem><para>Configures the NUMA memory policy for the service manager and the default NUMA memory policy
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for all forked off processes. Individual services may override the default policy with the
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<varname>NUMAPolicy=</varname> setting in unit files, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NUMAMask=</varname></term>
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<listitem><para>Configures the NUMA node mask that will be associated with the selected NUMA policy. Note that
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<option>default</option> and <option>local</option> NUMA policies don't require explicit NUMA node mask and
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value of the option can be empty. Similarly to <varname>NUMAPolicy=</varname>, value can be overridden
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by individual services in unit files, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RuntimeWatchdogSec=</varname></term>
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<term><varname>RebootWatchdogSec=</varname></term>
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<term><varname>KExecWatchdogSec=</varname></term>
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<listitem><para>Configure the hardware watchdog at runtime and at reboot. Takes a timeout value in seconds (or
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in other time units if suffixed with <literal>ms</literal>, <literal>min</literal>, <literal>h</literal>,
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<literal>d</literal>, <literal>w</literal>). If <varname>RuntimeWatchdogSec=</varname> is set to a non-zero
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value, the watchdog hardware (<filename>/dev/watchdog</filename> or the path specified with
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<varname>WatchdogDevice=</varname> or the kernel option <varname>systemd.watchdog-device=</varname>) will be
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programmed to automatically reboot the system if it is not contacted within the specified timeout interval. The
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system manager will ensure to contact it at least once in half the specified timeout interval. This feature
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requires a hardware watchdog device to be present, as it is commonly the case in embedded and server
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systems. Not all hardware watchdogs allow configuration of all possible reboot timeout values, in which case
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the closest available timeout is picked. <varname>RebootWatchdogSec=</varname> may be used to configure the
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hardware watchdog when the system is asked to reboot. It works as a safety net to ensure that the reboot takes
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place even if a clean reboot attempt times out. Note that the <varname>RebootWatchdogSec=</varname> timeout
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applies only to the second phase of the reboot, i.e. after all regular services are already terminated, and
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after the system and service manager process (PID 1) got replaced by the <filename>systemd-shutdown</filename>
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binary, see system <citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for details. During the first phase of the shutdown operation the system and service manager remains running
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and hence <varname>RuntimeWatchdogSec=</varname> is still honoured. In order to define a timeout on this first
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phase of system shutdown, configure <varname>JobTimeoutSec=</varname> and <varname>JobTimeoutAction=</varname>
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in the <literal>[Unit]</literal> section of the <filename>shutdown.target</filename> unit. By default
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<varname>RuntimeWatchdogSec=</varname> defaults to 0 (off), and <varname>RebootWatchdogSec=</varname> to
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10min. <varname>KExecWatchdogSec=</varname> may be used to additionally enable the watchdog when kexec
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is being executed rather than when rebooting. Note that if the kernel does not reset the watchdog on kexec (depending
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on the specific hardware and/or driver), in this case the watchdog might not get disabled after kexec succeeds
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and thus the system might get rebooted, unless <varname>RuntimeWatchdogSec=</varname> is also enabled at the same time.
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For this reason it is recommended to enable <varname>KExecWatchdogSec=</varname> only if
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<varname>RuntimeWatchdogSec=</varname> is also enabled.
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These settings have no effect if a hardware watchdog is not available.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>WatchdogDevice=</varname></term>
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<listitem><para>Configure the hardware watchdog device that the
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runtime and shutdown watchdog timers will open and use. Defaults
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to <filename>/dev/watchdog</filename>. This setting has no
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effect if a hardware watchdog is not available.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>CapabilityBoundingSet=</varname></term>
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<listitem><para>Controls which capabilities to include in the
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capability bounding set for PID 1 and its children. See
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<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for details. Takes a whitespace-separated list of capability
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names as read by
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<citerefentry project='mankier'><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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Capabilities listed will be included in the bounding set, all
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others are removed. If the list of capabilities is prefixed
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with ~, all but the listed capabilities will be included, the
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effect of the assignment inverted. Note that this option also
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affects the respective capabilities in the effective,
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permitted and inheritable capability sets. The capability
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bounding set may also be individually configured for units
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using the <varname>CapabilityBoundingSet=</varname> directive
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for units, but note that capabilities dropped for PID 1 cannot
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be regained in individual units, they are lost for
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good.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NoNewPrivileges=</varname></term>
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<listitem><para>Takes a boolean argument. If true, ensures that PID 1
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and all its children can never gain new privileges through
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<citerefentry project='man-pages'><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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(e.g. via setuid or setgid bits, or filesystem capabilities).
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Defaults to false. General purpose distributions commonly rely
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on executables with setuid or setgid bits and will thus not
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function properly with this option enabled. Individual units
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cannot disable this option.
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Also see <ulink url="https://www.kernel.org/doc/html/latest/userspace-api/no_new_privs.html">No New Privileges Flag</ulink>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SystemCallArchitectures=</varname></term>
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<listitem><para>Takes a space-separated list of architecture
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identifiers. Selects from which architectures system calls may
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be invoked on this system. This may be used as an effective
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way to disable invocation of non-native binaries system-wide,
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for example to prohibit execution of 32-bit x86 binaries on
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64-bit x86-64 systems. This option operates system-wide, and
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acts similar to the
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<varname>SystemCallArchitectures=</varname> setting of unit
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files, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details. This setting defaults to the empty list, in which
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case no filtering of system calls based on architecture is
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applied. Known architecture identifiers are
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<literal>x86</literal>, <literal>x86-64</literal>,
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<literal>x32</literal>, <literal>arm</literal> and the special
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identifier <literal>native</literal>. The latter implicitly
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maps to the native architecture of the system (or more
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specifically, the architecture the system manager was compiled
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for). Set this setting to <literal>native</literal> to
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prohibit execution of any non-native binaries. When a binary
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executes a system call of an architecture that is not listed
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in this setting, it will be immediately terminated with the
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SIGSYS signal.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>TimerSlackNSec=</varname></term>
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<listitem><para>Sets the timer slack in nanoseconds for PID 1,
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which is inherited by all executed processes, unless
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overridden individually, for example with the
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<varname>TimerSlackNSec=</varname> setting in service units
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(for details see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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The timer slack controls the accuracy of wake-ups triggered by
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system timers. See
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<citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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for more information. Note that in contrast to most other time
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span definitions this parameter takes an integer value in
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nano-seconds if no unit is specified. The usual time units are
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understood too.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>StatusUnitFormat=</varname></term>
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<listitem><para>Takes either <option>name</option> or <option>description</option> as the value. If
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<option>name</option>, the system manager will use unit names in status messages, instead of the
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longer and more informative descriptions set with <varname>Description=</varname>, see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultTimerAccuracySec=</varname></term>
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<listitem><para>Sets the default accuracy of timer units. This
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controls the global default for the
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<varname>AccuracySec=</varname> setting of timer units, see
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details. <varname>AccuracySec=</varname> set in individual
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units override the global default for the specific unit.
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Defaults to 1min. Note that the accuracy of timer units is
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also affected by the configured timer slack for PID 1, see
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<varname>TimerSlackNSec=</varname> above.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultTimeoutStartSec=</varname></term>
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<term><varname>DefaultTimeoutStopSec=</varname></term>
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<term><varname>DefaultTimeoutAbortSec=</varname></term>
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<term><varname>DefaultRestartSec=</varname></term>
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<listitem><para>Configures the default timeouts for starting,
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stopping and aborting of units, as well as the default time to sleep
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between automatic restarts of units, as configured per-unit in
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<varname>TimeoutStartSec=</varname>,
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<varname>TimeoutStopSec=</varname>,
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<varname>TimeoutAbortSec=</varname> and
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<varname>RestartSec=</varname> (for services, see
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details on the per-unit settings). Disabled by default, when
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service with <varname>Type=oneshot</varname> is used.
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For non-service units,
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<varname>DefaultTimeoutStartSec=</varname> sets the default
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<varname>TimeoutSec=</varname>
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value. <varname>DefaultTimeoutStartSec=</varname> and
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<varname>DefaultTimeoutStopSec=</varname> default to
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90s. <varname>DefaultTimeoutAbortSec=</varname> is not set by default
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so that all units fall back to <varname>TimeoutStopSec=</varname>.
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<varname>DefaultRestartSec=</varname> defaults to
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100ms.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultStartLimitIntervalSec=</varname></term>
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<term><varname>DefaultStartLimitBurst=</varname></term>
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<listitem><para>Configure the default unit start rate
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limiting, as configured per-service by
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<varname>StartLimitIntervalSec=</varname> and
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<varname>StartLimitBurst=</varname>. See
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details on the per-service settings.
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<varname>DefaultStartLimitIntervalSec=</varname> defaults to
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10s. <varname>DefaultStartLimitBurst=</varname> defaults to
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5.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultEnvironment=</varname></term>
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<listitem><para>Sets manager environment variables passed to
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all executed processes. Takes a space-separated list of
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variable assignments. See
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<citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for details about environment variables.</para>
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<para>Example:
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<programlisting>DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
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Sets three variables
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<literal>VAR1</literal>,
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<literal>VAR2</literal>,
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<literal>VAR3</literal>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultCPUAccounting=</varname></term>
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<term><varname>DefaultBlockIOAccounting=</varname></term>
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<term><varname>DefaultMemoryAccounting=</varname></term>
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<term><varname>DefaultTasksAccounting=</varname></term>
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<term><varname>DefaultIOAccounting=</varname></term>
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<term><varname>DefaultIPAccounting=</varname></term>
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<listitem><para>Configure the default resource accounting settings, as configured per-unit by
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<varname>CPUAccounting=</varname>, <varname>BlockIOAccounting=</varname>, <varname>MemoryAccounting=</varname>,
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<varname>TasksAccounting=</varname>, <varname>IOAccounting=</varname> and <varname>IPAccounting=</varname>. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details on the per-unit settings. <varname>DefaultTasksAccounting=</varname> defaults to yes,
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<varname>DefaultMemoryAccounting=</varname> to &MEMORY_ACCOUNTING_DEFAULT;. <varname>DefaultCPUAccounting=</varname>
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defaults to yes if enabling CPU accounting doesn't require the CPU controller to be enabled (Linux 4.15+ using the
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unified hierarchy for resource control), otherwise it defaults to no. The other three settings default to no.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultTasksMax=</varname></term>
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<listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details. This setting applies to all unit types that support resource control settings, with the exception
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of slice units. Defaults to 15%, which equals 4915 with the kernel's defaults on the host, but might be smaller
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in OS containers.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DefaultLimitCPU=</varname></term>
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<term><varname>DefaultLimitFSIZE=</varname></term>
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<term><varname>DefaultLimitDATA=</varname></term>
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<term><varname>DefaultLimitSTACK=</varname></term>
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<term><varname>DefaultLimitCORE=</varname></term>
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<term><varname>DefaultLimitRSS=</varname></term>
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<term><varname>DefaultLimitNOFILE=</varname></term>
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<term><varname>DefaultLimitAS=</varname></term>
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<term><varname>DefaultLimitNPROC=</varname></term>
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<term><varname>DefaultLimitMEMLOCK=</varname></term>
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<term><varname>DefaultLimitLOCKS=</varname></term>
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<term><varname>DefaultLimitSIGPENDING=</varname></term>
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<term><varname>DefaultLimitMSGQUEUE=</varname></term>
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<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>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultOOMPolicy=</varname></term>
|
|
|
|
<listitem><para>Configure the default policy for reacting to processes being killed by the Linux
|
|
Out-Of-Memory (OOM) killer. This may be used to pick a global default for the per-unit
|
|
<varname>OOMPolicy=</varname> setting. See
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details. Note that this default is not used for services that have <varname>Delegate=</varname>
|
|
turned on.</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>
|