man/systemd-system.conf.xml

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   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
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  19   Lesser General Public License for more details.
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  24
  25 <refentry id="systemd-system.conf">
  26         <refentryinfo>
  27                 <title>systemd-system.conf</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemd-system.conf</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd-system.conf</refname>
  47                 <refname>systemd-user.conf</refname>
  48                 <refpurpose>System and session service manager configuration file</refpurpose>
  49         </refnamediv>
  50
  51         <refsynopsisdiv>
  52                 <para><filename>/etc/systemd/system.conf</filename></para>
  53                 <para><filename>/etc/systemd/user.conf</filename></para>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para>When run as system instance systemd reads the
  60                 configuration file <filename>system.conf</filename>,
  61                 otherwise <filename>user.conf</filename>. These
  62                 configuration files contain a few settings controlling
  63                 basic manager operations.</para>
  64
  65         </refsect1>
  66
  67         <refsect1>
  68                 <title>Options</title>
  69
  70                 <para>All options are configured in the
  71                 <literal>[Manager]</literal> section:</para>
  72
  73                 <variablelist class='systemd-directives'>
  74
  75                         <varlistentry>
  76                                 <term><varname>LogLevel=</varname></term>
  77                                 <term><varname>LogTarget=</varname></term>
  78                                 <term><varname>LogColor=</varname></term>
  79                                 <term><varname>LogLocation=</varname></term>
  80                                 <term><varname>DumpCore=yes</varname></term>
  81                                 <term><varname>CrashShell=no</varname></term>
  82                                 <term><varname>ShowStatus=yes</varname></term>
  83                                 <term><varname>CrashChVT=1</varname></term>
  84                                 <term><varname>DefaultStandardOutput=journal</varname></term>
  85                                 <term><varname>DefaultStandardError=inherit</varname></term>
  86
  87                                 <listitem><para>Configures various
  88                                 parameters of basic manager
  89                                 operation. These options may be
  90                                 overridden by the respective command
  91                                 line arguments. See
  92                                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  93                                 for details about these command line
  94                                 arguments.</para></listitem>
  95                         </varlistentry>
  96
  97                         <varlistentry>
  98                                 <term><varname>CPUAffinity=</varname></term>
  99
 100                                 <listitem><para>Configures the initial
 101                                 CPU affinity for the init
 102                                 process. Takes a space-separated list
 103                                 of CPU indexes.</para></listitem>
 104                         </varlistentry>
 105
 106                         <varlistentry>
 107                                 <term><varname>DefaultControllers=cpu</varname></term>
 108
 109                                 <listitem><para>Configures in which
 110                                 control group hierarchies to create
 111                                 per-service cgroups automatically, in
 112                                 addition to the
 113                                 <literal>name=systemd</literal> named
 114                                 hierarchy. Defaults to
 115                                 <literal>cpu</literal>. Takes a space
 116                                 separated list of controller
 117                                 names. Pass the empty string to ensure
 118                                 that systemd does not touch any
 119                                 hierarchies but its own.</para>
 120
 121                                 <para>Note that the default value of
 122                                 'cpu' will make realtime scheduling
 123                                 unavailable to system services. See
 124                                 <ulink
 125                                 url="http://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime">My
 126                                 Service Can't Get Realtime!</ulink>
 127                                 for more
 128                                 information.</para></listitem>
 129                         </varlistentry>
 130
 131                         <varlistentry>
 132                                 <term><varname>JoinControllers=cpu,cpuacct,cpuset net_cls,netprio</varname></term>
 133
 134                                 <listitem><para>Configures controllers
 135                                 that shall be mounted in a single
 136                                 hierarchy. By default systemd will
 137                                 mount all controllers which are
 138                                 enabled in the kernel in individual
 139                                 hierarchies, with the exception of
 140                                 those listed in this setting. Takes a
 141                                 space separated list of comma
 142                                 separated controller names, in order
 143                                 to allow multiple joined
 144                                 hierarchies. Defaults to
 145                                 'cpu,cpuacct'. Pass an empty string to
 146                                 ensure that systemd mounts all
 147                                 controllers in separate
 148                                 hierarchies.</para>
 149
 150                                 <para>Note that this option is only
 151                                 applied once, at very early boot. If
 152                                 you use an initial RAM disk (initrd)
 153                                 that uses systemd it might hence be
 154                                 necessary to rebuild the initrd if
 155                                 this option is changed, and make sure
 156                                 the new configuration file is included
 157                                 in it. Otherwise the initrd might
 158                                 mount the controller hierachies in a
 159                                 different configuration than intended,
 160                                 and the main system cannot remount
 161                                 them anymore.</para></listitem>
 162                         </varlistentry>
 163
 164                         <varlistentry>
 165                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 166                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 167
 168                                 <listitem><para>Configure the hardware
 169                                 watchdog at runtime and at
 170                                 reboot. Takes a timeout value in
 171                                 seconds (or in other time units if
 172                                 suffixed with <literal>ms</literal>,
 173                                 <literal>min</literal>,
 174                                 <literal>h</literal>,
 175                                 <literal>d</literal>,
 176                                 <literal>w</literal>). If
 177                                 <varname>RuntimeWatchdogSec=</varname>
 178                                 is set to a non-zero value the
 179                                 watchdog hardware
 180                                 (<filename>/dev/watchdog</filename>)
 181                                 will be programmed to automatically
 182                                 reboot the system if it is not
 183                                 contacted within the specified timeout
 184                                 interval. The system manager will
 185                                 ensure to contact it at least once in
 186                                 half the specified timeout
 187                                 interval. This feature requires a
 188                                 hardware watchdog device to be
 189                                 present, as it is commonly the case in
 190                                 embedded and server systems. Not all
 191                                 hardware watchdogs allow configuration
 192                                 of the reboot timeout, in which case
 193                                 the closest available timeout is
 194                                 picked. <varname>ShutdownWatchdogSec=</varname>
 195                                 may be used to configure the hardware
 196                                 watchdog when the system is asked to
 197                                 reboot. It works as a safety net to
 198                                 ensure that the reboot takes place
 199                                 even if a clean reboot attempt times
 200                                 out. By default
 201                                 <varname>RuntimeWatchdogSec=</varname>
 202                                 defaults to 0 (off), and
 203                                 <varname>ShutdownWatchdogSec=</varname>
 204                                 to 10min. These settings have no
 205                                 effect if a hardware watchdog is not
 206                                 available.</para></listitem>
 207                         </varlistentry>
 208
 209                         <varlistentry>
 210                                 <term><varname>CapabilityBoundingSet=</varname></term>
 211
 212                                 <listitem><para>Controls which
 213                                 capabilities to include in the
 214                                 capability bounding set for PID 1 and
 215                                 its children. See
 216                                 <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 217                                 for details. Takes a whitespace
 218                                 separated list of capability names as
 219                                 read by
 220                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 221                                 Capabilities listed will be included
 222                                 in the bounding set, all others are
 223                                 removed. If the list of capabilities
 224                                 is prefixed with ~ all but the listed
 225                                 capabilities will be included, the
 226                                 effect of the assignment
 227                                 inverted. Note that this option also
 228                                 affects the respective capabilities in
 229                                 the effective, permitted and
 230                                 inheritable capability sets. The
 231                                 capability bounding set may also be
 232                                 individually configured for units
 233                                 using the
 234                                 <varname>CapabilityBoundingSet=</varname>
 235                                 directive for units, but note that
 236                                 capabilities dropped for PID 1 cannot
 237                                 be regained in individual units, they
 238                                 are lost for good.</para></listitem>
 239                         </varlistentry>
 240
 241                         <varlistentry>
 242                                 <term><varname>TimerSlackNSec=</varname></term>
 243
 244                                 <listitem><para>Sets the timer slack
 245                                 in nanoseconds for PID 1 which is then
 246                                 inherited to all executed processes,
 247                                 unless overridden individually, for
 248                                 example with the
 249                                 <varname>TimerSlackNSec=</varname>
 250                                 setting in service units (for details
 251                                 see
 252                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 253                                 timer slack controls the accuracy of
 254                                 wake-ups triggered by timers. See
 255                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 256                                 for more information. Note that in
 257                                 contrast to most other time span
 258                                 definitions this parameter takes an
 259                                 integer value in nano-seconds if no
 260                                 unit is specified. The usual time
 261                                 units are understood
 262                                 too.</para></listitem>
 263                         </varlistentry>
 264
 265                         <varlistentry>
 266                                 <term><varname>DefaultLimitCPU=</varname></term>
 267                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 268                                 <term><varname>DefaultLimitDATA=</varname></term>
 269                                 <term><varname>DefaultLimitSTACK=</varname></term>
 270                                 <term><varname>DefaultLimitCORE=</varname></term>
 271                                 <term><varname>DefaultLimitRSS=</varname></term>
 272                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 273                                 <term><varname>DefaultLimitAS=</varname></term>
 274                                 <term><varname>DefaultLimitNPROC=</varname></term>
 275                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 276                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 277                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 278                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 279                                 <term><varname>DefaultLimitNICE=</varname></term>
 280                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 281                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 282
 283                                 <listitem><para>These settings control
 284                                 various default resource limits for
 285                                 units. See
 286                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 287                                 for details. Use the string
 288                                 <varname>infinity</varname> to
 289                                 configure no limit on a specific
 290                                 resource. These settings may be
 291                                 overridden in individual units
 292                                 using the corresponding LimitXXX=
 293                                 directives. Note that these resource
 294                                 limits are only defaults for units,
 295                                 they are not applied to PID 1
 296                                 itself.</para></listitem>
 297                         </varlistentry>
 298                 </variablelist>
 299         </refsect1>
 300
 301         <refsect1>
 302                   <title>See Also</title>
 303                   <para>
 304                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 305                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 306                   </para>
 307         </refsect1>
 308
 309 </refentry>