mirror of
https://github.com/systemd/systemd.git
synced 2024-11-14 15:21:37 +03:00
72f4d9669c
This is a recurring submission and includes corrections to various issue spotted. I guess I can just skip over reporting ubiquitous comma placement fixes…
354 lines
15 KiB
XML
354 lines
15 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Zbigniew Jędrzejewski-Szmek
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
-->
|
|
|
|
<refentry id="systemd.resource-control">
|
|
<refentryinfo>
|
|
<title>systemd.resource-control</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Lennart</firstname>
|
|
<surname>Poettering</surname>
|
|
<email>lennart@poettering.net</email>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd.resource-control</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd.resource-control</refname>
|
|
<refpurpose>Resource control unit settings</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para>
|
|
<filename><replaceable>slice</replaceable>.slice</filename>,
|
|
<filename><replaceable>scope</replaceable>.scope</filename>,
|
|
<filename><replaceable>service</replaceable>.service</filename>,
|
|
<filename><replaceable>socket</replaceable>.socket</filename>,
|
|
<filename><replaceable>mount</replaceable>.mount</filename>,
|
|
<filename><replaceable>swap</replaceable>.swap</filename>
|
|
</para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>Unit configuration files for services, slices, scopes,
|
|
sockets, mount points, and swap devices share a subset of
|
|
configuration options for resource control of spawned
|
|
processes. Internally, this relies on the Control Groups
|
|
kernel concept for organizing processes in a hierarchial tree of
|
|
named groups for the purpose of resource management.</para>
|
|
|
|
<para>This man page lists the configuration options shared by
|
|
those six unit types. See
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for the common options of all unit configuration files, and
|
|
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
and
|
|
<citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for more information on the specific unit configuration files. The
|
|
resource control configuration options are configured in the
|
|
[Slice], [Scope], [Service], [Socket], [Mount], or [Swap]
|
|
sections, depending on the unit type.</para>
|
|
|
|
<para>See the <ulink
|
|
url="http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New
|
|
Control Group Interfaces</ulink> for an introduction on how to make
|
|
use of resource control APIs from programs.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Options</title>
|
|
|
|
<para>Units of the types listed above can have settings
|
|
for resource control configuration:</para>
|
|
|
|
<variablelist class='unit-directives'>
|
|
|
|
<varlistentry>
|
|
<term><varname>CPUAccounting=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Turn on CPU usage accounting for this unit. Takes a
|
|
boolean argument. Note that turning on CPU accounting for
|
|
one unit might also implicitly turn it on for all units
|
|
contained in the same slice and for all its parent slices and
|
|
the units contained therein.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>CPUShares=<replaceable>weight</replaceable></varname></term>
|
|
|
|
<listitem>
|
|
<para>Assign the specified overall CPU time share weight to
|
|
the processes executed. Takes an integer value. This
|
|
controls the <literal>cpu.shares</literal> control group
|
|
attribute, which defaults to 1024. For details about this
|
|
control group attribute, see <ulink
|
|
url="https://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt">sched-design-CFS.txt</ulink>.</para>
|
|
|
|
<para>Implies <literal>CPUAccounting=true</literal>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>MemoryAccounting=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Turn on process and kernel memory accounting for this
|
|
unit. Takes a boolean argument. Note that turning on memory
|
|
accounting for one unit might also implicitly turn it on for
|
|
all units contained in the same slice and for all its parent
|
|
slices and the units contained therein.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>MemoryLimit=<replaceable>bytes</replaceable></varname></term>
|
|
|
|
<listitem>
|
|
<para>Specify the limit on maximum memory usage of the
|
|
executed processes. The limit specifies how much process and
|
|
kernel memory can be used by tasks in this unit. Takes a
|
|
memory size in bytes. If the value is suffixed with K, M, G
|
|
or T, the specified memory size is parsed as Kilobytes,
|
|
Megabytes, Gigabytes, or Terabytes (with the base 1024),
|
|
respectively. This controls the
|
|
<literal>memory.limit_in_bytes</literal> control group
|
|
attribute. For details about this control group attribute,
|
|
see <ulink
|
|
url="https://www.kernel.org/doc/Documentation/cgroups/memory.txt">memory.txt</ulink>.</para>
|
|
|
|
<para>Implies <literal>MemoryAccounting=true</literal>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>BlockIOAccounting=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Turn on Block IO accounting for this unit. Takes a
|
|
boolean argument. Note that turning on block IO accounting
|
|
for one unit might also implicitly turn it on for all units
|
|
contained in the same slice and all for its parent slices and
|
|
the units contained therein.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>BlockIOWeight=<replaceable>weight</replaceable></varname></term>
|
|
|
|
<listitem><para>Set the default
|
|
overall block IO weight for the
|
|
executed processes. Takes a single
|
|
weight value (between 10 and 1000) to
|
|
set the default block IO weight. This
|
|
controls the
|
|
<literal>blkio.weight</literal>
|
|
control group attribute, which
|
|
defaults to 1000. For details about
|
|
this control group attribute, see
|
|
<ulink
|
|
url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.</para>
|
|
|
|
<para>Implies
|
|
<literal>BlockIOAccounting=true</literal>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>BlockIODeviceWeight=<replaceable>device</replaceable> <replaceable>weight</replaceable></varname></term>
|
|
|
|
<listitem>
|
|
<para>Set the per-device overall block IO weight for the
|
|
executed processes. Takes a space-separated pair of a file
|
|
path and a weight value to specify the device specific
|
|
weight value, between 10 and 1000. (Example: "/dev/sda
|
|
500"). The file path may be specified as path to a block
|
|
device node or as any other file, in which case the backing
|
|
block device of the file system of the file is
|
|
determined. This controls the
|
|
<literal>blkio.weight_device</literal> control group
|
|
attribute, which defaults to 1000. Use this option multiple
|
|
times to set weights for multiple devices. For details about
|
|
this control group attribute, see <ulink
|
|
url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.</para>
|
|
|
|
<para>Implies
|
|
<literal>BlockIOAccounting=true</literal>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>BlockIOReadBandwidth=<replaceable>device</replaceable> <replaceable>bytes</replaceable></varname></term>
|
|
<term><varname>BlockIOWriteBandwidth=<replaceable>device</replaceable> <replaceable>bytes</replaceable></varname></term>
|
|
|
|
<listitem>
|
|
<para>Set the per-device overall block IO bandwidth limit
|
|
for the executed processes. Takes a space-separated pair of
|
|
a file path and a bandwidth value (in bytes per second) to
|
|
specify the device specific bandwidth. The file path may be
|
|
a path to a block device node, or as any other file in which
|
|
case the backing block device of the file system of the file
|
|
is used. If the bandwidth is suffixed with K, M, G, or T,
|
|
the specified bandwidth is parsed as Kilobytes, Megabytes,
|
|
Gigabytes, or Terabytes, respectively (Example:
|
|
"/dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0 5M"). This
|
|
controls the <literal>blkio.read_bps_device</literal> and
|
|
<literal>blkio.write_bps_device</literal> control group
|
|
attributes. Use this option multiple times to set bandwidth
|
|
limits for multiple devices. For details about these control
|
|
group attributes, see
|
|
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.
|
|
</para>
|
|
|
|
<para>Implies
|
|
<literal>BlockIOAccounting=true</literal>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DeviceAllow=</varname></term>
|
|
|
|
<listitem>
|
|
<para>Control access to specific device nodes by the
|
|
executed processes. Takes two space-separated strings: a
|
|
device node path (such as <filename>/dev/null</filename>)
|
|
followed by a combination of <constant>r</constant>,
|
|
<constant>w</constant>, <constant>m</constant> to control
|
|
<emphasis>r</emphasis>eading, <emphasis>w</emphasis>riting,
|
|
or creation of the specific device node by the unit
|
|
(<emphasis>m</emphasis>knod), respectively. This controls
|
|
the <literal>devices.allow</literal> and
|
|
<literal>devices.deny</literal> control group
|
|
attributes. For details about these control group attributes,
|
|
see <ulink
|
|
url="https://www.kernel.org/doc/Documentation/cgroups/devices.txt">devices.txt</ulink>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>DevicePolicy=auto|closed|strict</varname></term>
|
|
|
|
<listitem>
|
|
<para>
|
|
Control the policy for allowing device access:
|
|
</para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><option>strict</option></term>
|
|
<listitem>
|
|
<para>means to only allow types of access that are
|
|
explicitly specified.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>closed</option></term>
|
|
<listitem>
|
|
<para>in addition, allows access to standard pseudo
|
|
devices including
|
|
<filename>/dev/null</filename>,
|
|
<filename>/dev/zero</filename>,
|
|
<filename>/dev/full</filename>,
|
|
<filename>/dev/random</filename>, and
|
|
<filename>/dev/urandom</filename>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>auto</option></term>
|
|
<listitem>
|
|
<para>
|
|
in addition, allows access to all devices if no
|
|
explicit <varname>DeviceAllow=</varname> is present.
|
|
This is the default.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Slice=</varname></term>
|
|
|
|
<listitem>
|
|
<para>The name of the slice unit to place the unit
|
|
in. Defaults to <filename>system.slice</filename> for all
|
|
non-instantiated units of all unit types (except for slice
|
|
units themselves see below). Instance units are by default
|
|
placed in a subslice of <filename>system.slice</filename>
|
|
that is named after the template name.</para>
|
|
|
|
<para>This option may be used to arrange systemd units in a
|
|
hierarchy of slices each of which might have resource
|
|
settings applied.</para>
|
|
|
|
<para>For units of type slice, the only accepted value for
|
|
this setting is the parent slice. Since the name of a slice
|
|
unit implies the parent slice, it is hence redundant to ever
|
|
set this parameter directly for slice units.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
The documentation for control groups and specific controllers in the Linux kernel:
|
|
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>,
|
|
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/cpuacct.txt">cpuacct.txt</ulink>,
|
|
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/memory.txt">memory.txt</ulink>,
|
|
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|