man/journald.conf.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
   3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   4         "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   5
   6 <!--
   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
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 -->
  24
  25 <refentry id="journald.conf">
  26         <refentryinfo>
  27                 <title>journald.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>journald.conf</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>journald.conf</refname>
  47                 <refpurpose>Journal service configuration file</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename>/etc/systemd/journald.conf</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para>This files configures various parameters of the
  58                 systemd journal service
  59                 <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
  60
  61         </refsect1>
  62
  63         <refsect1>
  64                 <title>Options</title>
  65
  66                 <para>All options are configured in the
  67                 <literal>[Journal]</literal> section:</para>
  68
  69                 <variablelist>
  70
  71                         <varlistentry>
  72                                 <term><varname>Storage=</varname></term>
  73
  74                                 <listitem><para>Controls where to
  75                                 store journal data. One of
  76                                 <literal>volatile</literal>,
  77                                 <literal>persistent</literal>,
  78                                 <literal>auto</literal> and
  79                                 <literal>none</literal>. If
  80                                 <literal>volatile</literal> journal
  81                                 log data will be stored only in
  82                                 memory, i.e. below the
  83                                 <filename>/run/log/journal</filename>
  84                                 hierarchy (which is created if
  85                                 needed). If
  86                                 <literal>persistent</literal> data will
  87                                 be stored preferably on disk,
  88                                 i.e. below the
  89                                 <filename>/var/log/journal</filename>
  90                                 hierarchy (which is created if
  91                                 needed), with a fallback to
  92                                 <filename>/run/log/journal</filename>
  93                                 (which is created if needed), during
  94                                 early boot and if the disk is not
  95                                 writable. <literal>auto</literal> is
  96                                 similar to
  97                                 <literal>persistent</literal> but the
  98                                 directory
  99                                 <filename>/var/log/journal</filename>
 100                                 is not created if needed, so that its
 101                                 existence controls where log data
 102                                 goes. <literal>none</literal> turns
 103                                 off all storage, all log data received
 104                                 will be dropped. Forwarding to other
 105                                 targets, such as the console, the
 106                                 kernel log buffer or a syslog daemon
 107                                 will still work however.  Defaults to
 108                                 <literal>auto</literal>.</para></listitem>
 109                         </varlistentry>
 110
 111                         <varlistentry>
 112                                 <term><varname>Compress=</varname></term>
 113
 114                                 <listitem><para>Takes a boolean
 115                                 value. If enabled (the default) data
 116                                 objects that shall be stored in the
 117                                 journal and are larger than a certain
 118                                 threshold are compressed with the XZ
 119                                 compression algorithm before they are
 120                                 written to the file
 121                                 system.</para></listitem>
 122                         </varlistentry>
 123
 124                         <varlistentry>
 125                                 <term><varname>Seal=</varname></term>
 126
 127                                 <listitem><para>Takes a boolean
 128                                 value. If enabled (the default) and a
 129                                 sealing key is available (as created
 130                                 by
 131                                 <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
 132                                 <option>--setup-keys</option>
 133                                 command), forward secure sealing (FSS) for
 134                                 all persistent journal files is
 135                                 enabled.</para></listitem>
 136                         </varlistentry>
 137
 138                         <varlistentry>
 139                                 <term><varname>SplitMode=</varname></term>
 140
 141                                 <listitem><para>Controls whether to
 142                                 split up journal files per user. One
 143                                 of <literal>login</literal>,
 144                                 <literal>uid</literal> and
 145                                 <literal>none</literal>. If
 146                                 <literal>login</literal> each logged
 147                                 in user will get his own journal
 148                                 files, but systemd user IDs will log
 149                                 into the system journal. If
 150                                 <literal>uid</literal> any user ID
 151                                 will get his own journal files
 152                                 regardless whether it belongs to a
 153                                 system service or refers to a real
 154                                 logged in user. If
 155                                 <literal>none</literal> journal files
 156                                 are not split up per-user and all
 157                                 messages are stored in the single
 158                                 system journal. Note that splitting
 159                                 up journal files per-user is only
 160                                 available of journals are stored
 161                                 persistently. If journals are stored
 162                                 on volatile storage (see above) only a
 163                                 single journal file for all user IDs
 164                                 is kept. Defaults to
 165                                 <literal>login</literal>.</para></listitem>
 166                         </varlistentry>
 167
 168                         <varlistentry>
 169                                 <term><varname>RateLimitInterval=</varname></term>
 170                                 <term><varname>RateLimitBurst=</varname></term>
 171
 172                                 <listitem><para>Configures the rate
 173                                 limiting that is applied to all
 174                                 messages generated on the system. If
 175                                 in the time interval defined by
 176                                 <varname>RateLimitInterval=</varname>
 177                                 more messages than specified in
 178                                 <varname>RateLimitBurst=</varname> are
 179                                 logged by a service all further
 180                                 messages within the interval are
 181                                 dropped, until the interval is over. A
 182                                 message about the number of dropped
 183                                 messages is generated. This rate
 184                                 limiting is applied per-service, so
 185                                 that two services which log do not
 186                                 interfere with each other's
 187                                 limit. Defaults to 100 messages in
 188                                 10s. The time specification for
 189                                 <varname>RateLimitInterval=</varname>
 190                                 may be specified in the following
 191                                 units: <literal>s</literal>,
 192                                 <literal>min</literal>,
 193                                 <literal>h</literal>,
 194                                 <literal>ms</literal>,
 195                                 <literal>us</literal>. To turn off any
 196                                 kind of rate limiting, set either
 197                                 value to 0.</para></listitem>
 198                         </varlistentry>
 199
 200                         <varlistentry>
 201                                 <term><varname>SystemMaxUse=</varname></term>
 202                                 <term><varname>SystemKeepFree=</varname></term>
 203                                 <term><varname>SystemMaxFileSize=</varname></term>
 204                                 <term><varname>SystemMinFileSize=</varname></term>
 205                                 <term><varname>RuntimeMaxUse=</varname></term>
 206                                 <term><varname>RuntimeKeepFree=</varname></term>
 207                                 <term><varname>RuntimeMaxFileSize=</varname></term>
 208                                 <term><varname>RuntimeMinFileSize=</varname></term>
 209
 210                                 <listitem><para>Enforce size limits on
 211                                 the journal files stored. The options
 212                                 prefixed with
 213                                 <literal>System</literal> apply to the
 214                                 journal files when stored on a
 215                                 persistent file system, more
 216                                 specifically
 217                                 <filename>/var/log/journal</filename>. The
 218                                 options prefixed with
 219                                 <literal>Runtime</literal> apply to
 220                                 the journal files when stored on a
 221                                 volatile in-memory file system, more
 222                                 specifically
 223                                 <filename>/run/log/journal</filename>. The
 224                                 former is used only when
 225                                 <filename>/var</filename> is mounted,
 226                                 writable and the directory
 227                                 <filename>/var/log/journal</filename>
 228                                 exists. Otherwise only the latter
 229                                 applies. Note that this means that
 230                                 during early boot and if the
 231                                 administrator disabled persistent
 232                                 logging only the latter options apply,
 233                                 while the former apply if persistent
 234                                 logging is enabled and the system is
 235                                 fully booted
 236                                 up. <varname>SystemMaxUse=</varname>
 237                                 and <varname>RuntimeMaxUse=</varname>
 238                                 control how much disk space the
 239                                 journal may use up at
 240                                 maximum. Defaults to 10% of the size
 241                                 of the respective file
 242                                 system. <varname>SystemKeepFree=</varname>
 243                                 and
 244                                 <varname>RuntimeKeepFree=</varname>
 245                                 control how much disk space the
 246                                 journal shall always leave free for
 247                                 other uses if less than the disk space
 248                                 configured in
 249                                 <varname>SystemMaxUse=</varname> and
 250                                 <varname>RuntimeMaxUse=</varname> is
 251                                 available. Defaults to 5% of the size
 252                                 of the respective file
 253                                 system. <varname>SystemMaxFileSize=</varname>
 254                                 and
 255                                 <varname>RuntimeMaxFileSize=</varname>
 256                                 control how large individual journal
 257                                 files may grow at maximum. This
 258                                 influences the granularity in which
 259                                 disk space is made available through
 260                                 rotation, i.e. deletion of historic
 261                                 data. Defaults to one eighth of the
 262                                 values configured with
 263                                 <varname>SystemMaxUse=</varname> and
 264                                 <varname>RuntimeMaxUse=</varname>, so
 265                                 that usually seven rotated journal
 266                                 files are kept as
 267                                 history. <varname>SystemMinFileSize=</varname>
 268                                 and
 269                                 <varname>RuntimeMinFileSize=</varname>
 270                                 control how large individual journal
 271                                 files grow at minimum. Defaults to
 272                                 64K. Specify values in bytes or use
 273                                 K, M, G, T, P, E as units for the
 274                                 specified sizes. Note that size limits
 275                                 are enforced synchronously to journal
 276                                 files as they are extended, and need
 277                                 no explicit rotation step triggered by
 278                                 time.</para></listitem>
 279                         </varlistentry>
 280
 281                         <varlistentry>
 282                                 <term><varname>ForwardToSyslog=</varname></term>
 283                                 <term><varname>ForwardToKMsg=</varname></term>
 284                                 <term><varname>ForwardToConsole=</varname></term>
 285
 286                                 <listitem><para>Control whether log
 287                                 messages received by the journal
 288                                 daemon shall be forwarded to a
 289                                 traditional syslog daemon, to the
 290                                 kernel log buffer (kmsg), or to the
 291                                 system console. These options take
 292                                 boolean arguments. If forwarding to
 293                                 syslog is enabled but no syslog daemon
 294                                 is running the respective option has
 295                                 no effect. By default only forwarding
 296                                 to syslog is enabled. These settings
 297                                 may be overridden at boot time with
 298                                 the kernel command line options
 299                                 <literal>systemd.journald.forward_to_syslog=</literal>,
 300                                 <literal>systemd.journald.forward_to_kmsg=</literal>
 301                                 and
 302                                 <literal>systemd.journald.forward_to_console=</literal>.
 303                                 </para></listitem>
 304                         </varlistentry>
 305
 306                         <varlistentry>
 307                                 <term><varname>MaxLevelStore=</varname></term>
 308                                 <term><varname>MaxLevelSyslog=</varname></term>
 309                                 <term><varname>MaxLevelKMsg=</varname></term>
 310                                 <term><varname>MaxLevelConsole=</varname></term>
 311
 312                                 <listitem><para>Controls the maximum
 313                                 log level of messages that are stored
 314                                 on disk, forwarded to syslog, kmsg or
 315                                 the console (if that is enabled, see
 316                                 above). As argument, takes one of
 317                                 <literal>emerg</literal>,
 318                                 <literal>alert</literal>,
 319                                 <literal>crit</literal>,
 320                                 <literal>err</literal>,
 321                                 <literal>warning</literal>,
 322                                 <literal>notice</literal>,
 323                                 <literal>info</literal>,
 324                                 <literal>debug</literal> or integer
 325                                 values in the range of 0..7 (corresponding
 326                                 to the same levels). Messages equal or below
 327                                 the log level specified are
 328                                 stored/forwarded, messages above are
 329                                 dropped. Defaults to
 330                                 <literal>debug</literal> for
 331                                 <varname>MaxLevelStore=</varname> and
 332                                 <varname>MaxLevelSyslog=</varname>, to
 333                                 ensure that the all messages are
 334                                 written to disk and forwarded to
 335                                 syslog. Defaults to
 336                                 <literal>notice</literal> for
 337                                 <varname>MaxLevelKMsg=</varname> and
 338                                 <literal>info</literal> for
 339                                 <varname>MaxLevelConsole=</varname>.</para></listitem>
 340                         </varlistentry>
 341
 342                         <varlistentry>
 343                                 <term><varname>TTYPath=</varname></term>
 344
 345                                 <listitem><para>Change the console TTY
 346                                 to use if
 347                                 <varname>ForwardToConsole=yes</varname>
 348                                 is used. Defaults to
 349                                 <filename>/dev/console</filename>.</para></listitem>
 350                         </varlistentry>
 351
 352                 </variablelist>
 353
 354         </refsect1>
 355
 356         <refsect1>
 357                   <title>See Also</title>
 358                   <para>
 359                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 360                           <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 361                           <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 362                           <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 363                           <citerefentry><refentrytitle>systemd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 364                   </para>
 365         </refsect1>
 366
 367 </refentry>