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583 lines
32 KiB
XML
583 lines
32 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-or-later -->
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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>~/.config/systemd/user.conf</filename>,
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<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, <command>systemd</command> interprets the configuration file
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<filename>system.conf</filename> and the files in <filename>system.conf.d</filename> directories; when
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run as a user instance, it interprets the configuration file <filename>user.conf</filename> (either in
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the home directory of the user, or if not found, under <filename>/etc/systemd/</filename>) and the files
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in <filename>user.conf.d</filename> directories. These configuration files contain a few settings
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controlling basic manager operations.</para>
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<para>See
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry> for a
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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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[Manager] section:</para>
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<variablelist class='config-directives'>
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<varlistentry>
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<term><varname>LogColor=</varname></term>
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<term><varname>LogLevel=</varname></term>
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<term><varname>LogLocation=</varname></term>
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<term><varname>LogTarget=</varname></term>
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<term><varname>LogTime=</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
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seconds (or in other time units if suffixed with <literal>ms</literal>, <literal>min</literal>,
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<literal>h</literal>, <literal>d</literal>, <literal>w</literal>), or the special strings
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<literal>off</literal> or <literal>default</literal>. If set to <literal>off</literal>
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(alternatively: <literal>0</literal>) the watchdog logic is disabled: no watchdog device is opened,
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configured, or pinged. If set to the special string <literal>default</literal> the watchdog is opened
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and pinged in regular intervals, but the timeout is not changed from the default. If set to any other
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time value the watchdog timeout is configured to the specified value (or a value close to it,
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depending on hardware capabilities).</para>
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<para>If <varname>RuntimeWatchdogSec=</varname> is set to a non-zero value, the watchdog hardware
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(<filename>/dev/watchdog0</filename> or the path specified with <varname>WatchdogDevice=</varname> or
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the kernel option <varname>systemd.watchdog-device=</varname>) will be programmed to automatically
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reboot the system if it is not contacted within the specified timeout interval. The system manager
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will ensure to contact it at least once in half the specified timeout interval. This feature requires
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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
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which case the closest available timeout is picked.</para>
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<para><varname>RebootWatchdogSec=</varname> may be used to configure the hardware watchdog when the
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system is asked to reboot. It works as a safety net to ensure that the reboot takes place even if a
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clean reboot attempt times out. Note that the <varname>RebootWatchdogSec=</varname> timeout applies
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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
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<filename>systemd-shutdown</filename> binary, see system
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<citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
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details. During the first phase of the shutdown operation the system and service manager remains
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running and hence <varname>RuntimeWatchdogSec=</varname> is still honoured. In order to define a
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timeout on this first phase of system shutdown, configure <varname>JobTimeoutSec=</varname> and
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<varname>JobTimeoutAction=</varname> in the [Unit] section of the
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<filename>shutdown.target</filename> unit. By default <varname>RuntimeWatchdogSec=</varname> defaults
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to 0 (off), and <varname>RebootWatchdogSec=</varname> to 10min.</para>
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<para><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
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kexec (depending on the specific hardware and/or driver), in this case the watchdog might not get
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disabled after kexec succeeds and thus the system might get rebooted, unless
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<varname>RuntimeWatchdogSec=</varname> is also enabled at the same time. For this reason it is
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recommended to enable <varname>KExecWatchdogSec=</varname> only if
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<varname>RuntimeWatchdogSec=</varname> is also enabled.</para>
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<para>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>RuntimeWatchdogPreSec=</varname></term>
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<listitem><para>Configure the hardware watchdog device pre-timeout value.
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Takes a timeout value in seconds (or in other time units similar to
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<varname>RuntimeWatchdogSec=</varname>). A watchdog pre-timeout is a
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notification generated by the watchdog before the watchdog reset might
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occur in the event the watchdog has not been serviced. This notification
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is handled by the kernel and can be configured to take an action (i.e.
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generate a kernel panic) using <varname>RuntimeWatchdogPreGovernor=</varname>.
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Not all watchdog hardware or drivers support generating a pre-timeout and
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depending on the state of the system, the kernel may be unable to take the
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configured action before the watchdog reboot. The watchdog will be configured
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to generate the pre-timeout event at the amount of time specified by
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<varname>RuntimeWatchdogPreSec=</varname> before the runtime watchdog timeout
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(set by <varname>RuntimeWatchdogSec=</varname>). For example, if the we have
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<varname>RuntimeWatchdogSec=30</varname> and
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<varname>RuntimeWatchdogPreSec=10</varname>, then the pre-timeout event
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will occur if the watchdog has not pinged for 20s (10s before the
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watchdog would fire). By default, <varname>RuntimeWatchdogPreSec=</varname>
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defaults to 0 (off). The value set for <varname>RuntimeWatchdogPreSec=</varname>
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must be smaller than the timeout value for <varname>RuntimeWatchdogSec=</varname>.
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This setting has no effect if a hardware watchdog is not available or the
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hardware watchdog does not support a pre-timeout and will be ignored by the
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kernel if the setting is greater than the actual watchdog timeout.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RuntimeWatchdogPreGovernor=</varname></term>
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<listitem><para>Configure the action taken by the hardware watchdog device
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when the pre-timeout expires. The default action for the pre-timeout event
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depends on the kernel configuration, but it is usually to log a kernel
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message. For a list of valid actions available for a given watchdog device,
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check the content of the
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<filename>/sys/class/watchdog/watchdog<replaceable>X</replaceable>/pretimeout_available_governors</filename>
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file. Typically, available governor types are <varname>noop</varname> and <varname>panic</varname>.
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Availability, names and functionality might vary depending on the specific device driver
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in use. If the <filename>pretimeout_available_governors</filename> sysfs file is empty,
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the governor might be built as a kernel module and might need to be manually loaded
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(e.g. <varname>pretimeout_noop.ko</varname>), or the watchdog device might not support
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pre-timeouts.</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/watchdog0</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 <option>name</option>, <option>description</option> or
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<option>combined</option> as the value. If <option>name</option>, the system manager will use unit
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names in status messages (e.g. <literal>systemd-journald.service</literal>), instead of the longer
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and more informative descriptions set with <varname>Description=</varname> (e.g. <literal>Journal
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Logging Service</literal>). If <option>combined</option>, the system manager will use both unit names
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and descriptions in status messages (e.g. <literal>systemd-journald.service - Journal Logging
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Service</literal>).</para>
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<para>See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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|
details about unit names and <varname>Description=</varname>.</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,
|
|
stopping and aborting of units, as well as the default time to sleep
|
|
between automatic restarts of units, as configured per-unit in
|
|
<varname>TimeoutStartSec=</varname>,
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|
<varname>TimeoutStopSec=</varname>,
|
|
<varname>TimeoutAbortSec=</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
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|
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
|
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90s. <varname>DefaultTimeoutAbortSec=</varname> is not set by default
|
|
so that all units fall back to <varname>TimeoutStopSec=</varname>.
|
|
<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>Configures 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>Simple <literal>%</literal>-specifier expansion is supported, see below for a list of supported
|
|
specifiers.</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>ManagerEnvironment=</varname></term>
|
|
|
|
<listitem><para>Takes the same arguments as <varname>DefaultEnvironment=</varname>, see above. Sets
|
|
environment variables just for the manager process itself. In contrast to user managers, these variables
|
|
are not inherited by processes spawned by the system manager, use <varname>DefaultEnvironment=</varname>
|
|
for that. Note that these variables are merged into the existing environment block. In particular, in
|
|
case of the system manager, this includes variables set by the kernel based on the kernel command line.</para>
|
|
|
|
<para>Setting environment variables for the manager process may be useful to modify its behaviour.
|
|
See <ulink url="https://systemd.io/ENVIRONMENT">ENVIRONMENT</ulink> for a descriptions of some
|
|
variables understood by <command>systemd</command>.</para>
|
|
|
|
<para>Simple <literal>%</literal>-specifier expansion is supported, see below for a list of supported
|
|
specifiers.</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% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>
|
|
and root cgroup <varname>pids.max</varname>.
|
|
Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores.
|
|
For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915,
|
|
but might be greater in other systems or 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 processes executed by
|
|
units. See
|
|
<citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry> for
|
|
details. These settings may be overridden in individual units using the corresponding
|
|
<varname>LimitXXX=</varname> directives and they accept the same parameter syntax,
|
|
see <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details. Note that these resource limits are only defaults
|
|
for units, they are not applied to the service manager process (i.e. PID 1) itself.</para>
|
|
|
|
<para>Most of these settings are unset, which means the resource limits are inherited from the kernel or, if
|
|
invoked in a container, from the container manager. However, the following have defaults:</para>
|
|
<itemizedlist>
|
|
<listitem><para><varname>DefaultLimitNOFILE=</varname> defaults to 1024:&HIGH_RLIMIT_NOFILE;.
|
|
</para></listitem>
|
|
|
|
<listitem><para><varname>DefaultLimitMEMLOCK=</varname> defaults to 8M.</para></listitem>
|
|
|
|
<listitem><para><varname>DefaultLimitCORE=</varname> does not have a default but it is worth mentioning that
|
|
<varname>RLIMIT_CORE</varname> is set to <literal>infinity</literal> by PID 1 which is inherited by its
|
|
children.</para></listitem>
|
|
</itemizedlist>
|
|
|
|
<para>Note that the service manager internally in PID 1 bumps <varname>RLIMIT_NOFILE</varname> and
|
|
<varname>RLIMIT_MEMLOCK</varname> to higher values, however the limit is reverted to the mentioned
|
|
defaults for all child processes forked off.</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 or <command>systemd-oomd</command>. 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>
|
|
|
|
<varlistentry>
|
|
<term><varname>DefaultOOMScoreAdjust=</varname></term>
|
|
|
|
<listitem><para>Configures the default OOM score adjustments of processes run by the service
|
|
manager. This defaults to unset (meaning the forked off processes inherit the service manager's OOM
|
|
score adjustment value), except if the service manager is run for an unprivileged user, in which case
|
|
this defaults to the service manager's OOM adjustment value plus 100 (this makes service processes
|
|
slightly more likely to be killed under memory pressure than the manager itself). This may be used to
|
|
pick a global default for the per-unit <varname>OOMScoreAdjust=</varname> setting. See
|
|
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
|
|
details. Note that this setting has no effect on the OOM score adjustment value of the service
|
|
manager process itself, it retains the original value set during its invocation.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Specifiers</title>
|
|
|
|
<para>Specifiers may be used in the <varname>DefaultEnvironment=</varname> and
|
|
<varname>ManagerEnvironment=</varname> settings. The following expansions are understood:</para>
|
|
<table class='specifiers'>
|
|
<title>Specifiers available</title>
|
|
<tgroup cols='3' align='left' colsep='1' rowsep='1'>
|
|
<colspec colname="spec" />
|
|
<colspec colname="mean" />
|
|
<colspec colname="detail" />
|
|
<thead>
|
|
<row>
|
|
<entry>Specifier</entry>
|
|
<entry>Meaning</entry>
|
|
<entry>Details</entry>
|
|
</row>
|
|
</thead>
|
|
<tbody>
|
|
<xi:include href="standard-specifiers.xml" xpointer="a"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="A"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="b"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="B"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="H"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="l"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="m"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="M"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="o"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="v"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="w"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="W"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="T"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="V"/>
|
|
<xi:include href="standard-specifiers.xml" xpointer="percent"/>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</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>
|