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                                 cgroup controller hierarchies to
 111                                 create per-service cgroups
 112                                 automatically, in addition to the
 113                                 name=systemd named hierarchy. Defaults
 114                                 to 'cpu'. Takes a space separated list
 115                                 of controller names. Pass an empty
 116                                 string to ensure that systemd does not
 117                                 touch any hierarchies but its
 118                                 own.</para>
 119
 120                                 <para>Note that the default value of
 121                                 'cpu' will make realtime scheduling
 122                                 unavailable to system services. See
 123                                 <ulink
 124                                 url="http://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime">My
 125                                 Service Can't Get Realtime!</ulink>
 126                                 for more
 127                                 information.</para></listitem>
 128                         </varlistentry>
 129
 130                         <varlistentry>
 131                                 <term><varname>JoinControllers=cpu,cpuacct,cpuset net_cls,netprio</varname></term>
 132
 133                                 <listitem><para>Configures controllers
 134                                 that shall be mounted in a single
 135                                 hierarchy. By default systemd will
 136                                 mount all controllers which are
 137                                 enabled in the kernel in individual
 138                                 hierarchies, with the exception of
 139                                 those listed in this setting. Takes a
 140                                 space separated list of comma
 141                                 separated controller names, in order
 142                                 to allow multiple joined
 143                                 hierarchies. Defaults to
 144                                 'cpu,cpuacct'. Pass an empty string to
 145                                 ensure that systemd mounts all
 146                                 controllers in separate
 147                                 hierarchies.</para>
 148
 149                                 <para>Note that this option is only
 150                                 applied once, at very early boot. If
 151                                 you use an initial RAM disk (initrd)
 152                                 that uses systemd it might hence be
 153                                 necessary to rebuild the initrd if
 154                                 this option is changed, and make sure
 155                                 the new configuration file is included
 156                                 in it. Otherwise the initrd might
 157                                 mount the controller hierachies in a
 158                                 different configuration than intended,
 159                                 and the main system cannot remount
 160                                 them anymore.</para></listitem>
 161                         </varlistentry>
 162
 163                         <varlistentry>
 164                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 165                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 166
 167                                 <listitem><para>Configure the hardware
 168                                 watchdog at runtime and at
 169                                 reboot. Takes a timeout value in
 170                                 seconds (or in other time units if
 171                                 suffixed with <literal>ms</literal>,
 172                                 <literal>min</literal>,
 173                                 <literal>h</literal>,
 174                                 <literal>d</literal>,
 175                                 <literal>w</literal>). If
 176                                 <varname>RuntimeWatchdogSec=</varname>
 177                                 is set to a non-zero value the
 178                                 watchdog hardware
 179                                 (<filename>/dev/watchdog</filename>)
 180                                 will be programmed to automatically
 181                                 reboot the system if it is not
 182                                 contacted within the specified timeout
 183                                 interval. The system manager will
 184                                 ensure to contact it at least once in
 185                                 half the specified timeout
 186                                 interval. This feature requires a
 187                                 hardware watchdog device to be
 188                                 present, as it is commonly the case in
 189                                 embedded and server systems. Not all
 190                                 hardware watchdogs allow configuration
 191                                 of the reboot timeout, in which case
 192                                 the closest available timeout is
 193                                 picked. <varname>ShutdownWatchdogSec=</varname>
 194                                 may be used to configure the hardware
 195                                 watchdog when the system is asked to
 196                                 reboot. It works as a safety net to
 197                                 ensure that the reboot takes place
 198                                 even if a clean reboot attempt times
 199                                 out. By default
 200                                 <varname>RuntimeWatchdogSec=</varname>
 201                                 defaults to 0 (off), and
 202                                 <varname>ShutdownWatchdogSec=</varname>
 203                                 to 10min. These settings have no
 204                                 effect if a hardware watchdog is not
 205                                 available.</para></listitem>
 206                         </varlistentry>
 207
 208                         <varlistentry>
 209                                 <term><varname>CapabilityBoundingSet=</varname></term>
 210
 211                                 <listitem><para>Controls which
 212                                 capabilities to include in the
 213                                 capability bounding set for PID 1 and
 214                                 its children. See
 215                                 <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 216                                 for details. Takes a whitespace
 217                                 separated list of capability names as
 218                                 read by
 219                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 220                                 Capabilities listed will be included
 221                                 in the bounding set, all others are
 222                                 removed. If the list of capabilities
 223                                 is prefixed with ~ all but the listed
 224                                 capabilities will be included, the
 225                                 effect of the assignment
 226                                 inverted. Note that this option also
 227                                 affects the respective capabilities in
 228                                 the effective, permitted and
 229                                 inheritable capability sets. The
 230                                 capability bounding set may also be
 231                                 individually configured for units
 232                                 using the
 233                                 <varname>CapabilityBoundingSet=</varname>
 234                                 directive for units, but note that
 235                                 capabilities dropped for PID 1 cannot
 236                                 be regained in individual units, they
 237                                 are lost for good.</para></listitem>
 238                         </varlistentry>
 239
 240                         <varlistentry>
 241                                 <term><varname>TimerSlackNSec=</varname></term>
 242
 243                                 <listitem><para>Sets the timer slack
 244                                 in nanoseconds for PID 1 which is then
 245                                 inherited to all executed processes,
 246                                 unless overridden individually, for
 247                                 example with the
 248                                 <varname>TimerSlackNSec=</varname>
 249                                 setting in service units (for details
 250                                 see
 251                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 252                                 timer slack controls the accuracy of
 253                                 wake-ups triggered by timers. See
 254                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 255                                 for more information. Note that in
 256                                 contrast to most other time span
 257                                 definitions this parameter takes an
 258                                 integer value in nano-seconds if no
 259                                 unit is specified. The usual time
 260                                 units are understood
 261                                 too.</para></listitem>
 262                         </varlistentry>
 263
 264                         <varlistentry>
 265                                 <term><varname>DefaultLimitCPU=</varname></term>
 266                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 267                                 <term><varname>DefaultLimitDATA=</varname></term>
 268                                 <term><varname>DefaultLimitSTACK=</varname></term>
 269                                 <term><varname>DefaultLimitCORE=</varname></term>
 270                                 <term><varname>DefaultLimitRSS=</varname></term>
 271                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 272                                 <term><varname>DefaultLimitAS=</varname></term>
 273                                 <term><varname>DefaultLimitNPROC=</varname></term>
 274                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 275                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 276                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 277                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 278                                 <term><varname>DefaultLimitNICE=</varname></term>
 279                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 280                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 281
 282                                 <listitem><para>These settings control
 283                                 various default resource limits for
 284                                 units. See
 285                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 286                                 for details. Use the string
 287                                 <varname>infinity</varname> to
 288                                 configure no limit on a specific
 289                                 resource. These settings may be
 290                                 overridden in individual units
 291                                 using the corresponding LimitXXX=
 292                                 directives. Note that these resource
 293                                 limits are only defaults for units,
 294                                 they are not applied to PID 1
 295                                 itself.</para></listitem>
 296                         </varlistentry>
 297                 </variablelist>
 298         </refsect1>
 299
 300         <refsect1>
 301                   <title>See Also</title>
 302                   <para>
 303                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 304                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 305                   </para>
 306         </refsect1>
 307
 308 </refentry>