man/systemd-system.conf.xml

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   7   This file is part of systemd.
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   9   Copyright 2010 Lennart Poettering
  10
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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>JoinControllers=cpu,cpuacct net_cls,netprio</varname></term>
 108
 109                                 <listitem><para>Configures controllers
 110                                 that shall be mounted in a single
 111                                 hierarchy. By default, systemd will
 112                                 mount all controllers which are
 113                                 enabled in the kernel in individual
 114                                 hierarchies, with the exception of
 115                                 those listed in this setting. Takes a
 116                                 space-separated list of comma-separated
 117                                 controller names, in order
 118                                 to allow multiple joined
 119                                 hierarchies. Defaults to
 120                                 'cpu,cpuacct'. Pass an empty string to
 121                                 ensure that systemd mounts all
 122                                 controllers in separate
 123                                 hierarchies.</para>
 124
 125                                 <para>Note that this option is only
 126                                 applied once, at very early boot. If
 127                                 you use an initial RAM disk (initrd)
 128                                 that uses systemd, it might hence be
 129                                 necessary to rebuild the initrd if
 130                                 this option is changed, and make sure
 131                                 the new configuration file is included
 132                                 in it. Otherwise, the initrd might
 133                                 mount the controller hierarchies in a
 134                                 different configuration than intended,
 135                                 and the main system cannot remount
 136                                 them anymore.</para></listitem>
 137                         </varlistentry>
 138
 139                         <varlistentry>
 140                                 <term><varname>RuntimeWatchdogSec=</varname></term>
 141                                 <term><varname>ShutdownWatchdogSec=</varname></term>
 142
 143                                 <listitem><para>Configure the hardware
 144                                 watchdog at runtime and at
 145                                 reboot. Takes a timeout value in
 146                                 seconds (or in other time units if
 147                                 suffixed with <literal>ms</literal>,
 148                                 <literal>min</literal>,
 149                                 <literal>h</literal>,
 150                                 <literal>d</literal>,
 151                                 <literal>w</literal>). If
 152                                 <varname>RuntimeWatchdogSec=</varname>
 153                                 is set to a non-zero value, the
 154                                 watchdog hardware
 155                                 (<filename>/dev/watchdog</filename>)
 156                                 will be programmed to automatically
 157                                 reboot the system if it is not
 158                                 contacted within the specified timeout
 159                                 interval. The system manager will
 160                                 ensure to contact it at least once in
 161                                 half the specified timeout
 162                                 interval. This feature requires a
 163                                 hardware watchdog device to be
 164                                 present, as it is commonly the case in
 165                                 embedded and server systems. Not all
 166                                 hardware watchdogs allow configuration
 167                                 of the reboot timeout, in which case
 168                                 the closest available timeout is
 169                                 picked. <varname>ShutdownWatchdogSec=</varname>
 170                                 may be used to configure the hardware
 171                                 watchdog when the system is asked to
 172                                 reboot. It works as a safety net to
 173                                 ensure that the reboot takes place
 174                                 even if a clean reboot attempt times
 175                                 out. By default
 176                                 <varname>RuntimeWatchdogSec=</varname>
 177                                 defaults to 0 (off), and
 178                                 <varname>ShutdownWatchdogSec=</varname>
 179                                 to 10min. These settings have no
 180                                 effect if a hardware watchdog is not
 181                                 available.</para></listitem>
 182                         </varlistentry>
 183
 184                         <varlistentry>
 185                                 <term><varname>CapabilityBoundingSet=</varname></term>
 186
 187                                 <listitem><para>Controls which
 188                                 capabilities to include in the
 189                                 capability bounding set for PID 1 and
 190                                 its children. See
 191                                 <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 192                                 for details. Takes a whitespace-separated
 193                                 list of capability names as read by
 194                                 <citerefentry><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 195                                 Capabilities listed will be included
 196                                 in the bounding set, all others are
 197                                 removed. If the list of capabilities
 198                                 is prefixed with ~, all but the listed
 199                                 capabilities will be included, the
 200                                 effect of the assignment
 201                                 inverted. Note that this option also
 202                                 affects the respective capabilities in
 203                                 the effective, permitted and
 204                                 inheritable capability sets. The
 205                                 capability bounding set may also be
 206                                 individually configured for units
 207                                 using the
 208                                 <varname>CapabilityBoundingSet=</varname>
 209                                 directive for units, but note that
 210                                 capabilities dropped for PID 1 cannot
 211                                 be regained in individual units, they
 212                                 are lost for good.</para></listitem>
 213                         </varlistentry>
 214
 215                         <varlistentry>
 216                                 <term><varname>TimerSlackNSec=</varname></term>
 217
 218                                 <listitem><para>Sets the timer slack
 219                                 in nanoseconds for PID 1 which is then
 220                                 inherited to all executed processes,
 221                                 unless overridden individually, for
 222                                 example with the
 223                                 <varname>TimerSlackNSec=</varname>
 224                                 setting in service units (for details
 225                                 see
 226                                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). The
 227                                 timer slack controls the accuracy of
 228                                 wake-ups triggered by timers. See
 229                                 <citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 230                                 for more information. Note that in
 231                                 contrast to most other time span
 232                                 definitions this parameter takes an
 233                                 integer value in nano-seconds if no
 234                                 unit is specified. The usual time
 235                                 units are understood
 236                                 too.</para></listitem>
 237                         </varlistentry>
 238
 239                         <varlistentry>
 240                                 <term><varname>DefaultEnvironment=</varname></term>
 241
 242                                 <listitem><para>Sets manager
 243                                 environment variables passed to all
 244                                 executed processes. Takes a
 245                                 space-separated list of variable
 246                                 assignments. See
 247                                 <citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 248                                 for details about environment
 249                                 variables.</para>
 250
 251                                 <para>Example:
 252
 253                                 <programlisting>DefaultEnvironment="VAR1=word1 word2" VAR2=word3 "VAR3=word 5 6"</programlisting>
 254
 255                                 Sets three variables
 256                                 <literal>VAR1</literal>,
 257                                 <literal>VAR2</literal>,
 258                                 <literal>VAR3</literal>.</para></listitem>
 259                         </varlistentry>
 260
 261                         <varlistentry>
 262                                 <term><varname>DefaultLimitCPU=</varname></term>
 263                                 <term><varname>DefaultLimitFSIZE=</varname></term>
 264                                 <term><varname>DefaultLimitDATA=</varname></term>
 265                                 <term><varname>DefaultLimitSTACK=</varname></term>
 266                                 <term><varname>DefaultLimitCORE=</varname></term>
 267                                 <term><varname>DefaultLimitRSS=</varname></term>
 268                                 <term><varname>DefaultLimitNOFILE=</varname></term>
 269                                 <term><varname>DefaultLimitAS=</varname></term>
 270                                 <term><varname>DefaultLimitNPROC=</varname></term>
 271                                 <term><varname>DefaultLimitMEMLOCK=</varname></term>
 272                                 <term><varname>DefaultLimitLOCKS=</varname></term>
 273                                 <term><varname>DefaultLimitSIGPENDING=</varname></term>
 274                                 <term><varname>DefaultLimitMSGQUEUE=</varname></term>
 275                                 <term><varname>DefaultLimitNICE=</varname></term>
 276                                 <term><varname>DefaultLimitRTPRIO=</varname></term>
 277                                 <term><varname>DefaultLimitRTTIME=</varname></term>
 278
 279                                 <listitem><para>These settings control
 280                                 various default resource limits for
 281                                 units. See
 282                                 <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
 283                                 for details. Use the string
 284                                 <varname>infinity</varname> to
 285                                 configure no limit on a specific
 286                                 resource. These settings may be
 287                                 overridden in individual units
 288                                 using the corresponding LimitXXX=
 289                                 directives. Note that these resource
 290                                 limits are only defaults for units,
 291                                 they are not applied to PID 1
 292                                 itself.</para></listitem>
 293                         </varlistentry>
 294                 </variablelist>
 295         </refsect1>
 296
 297         <refsect1>
 298                   <title>See Also</title>
 299                   <para>
 300                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 301                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 302                           <citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 303                   </para>
 304         </refsect1>
 305
 306 </refentry>