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<refentry id= "journald.conf" >
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<refentryinfo >
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<title > journald.conf</title>
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<productname > systemd</productname>
<authorgroup >
<author >
<contrib > Developer</contrib>
<firstname > Lennart</firstname>
<surname > Poettering</surname>
<email > lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta >
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<refentrytitle > journald.conf</refentrytitle>
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<manvolnum > 5</manvolnum>
</refmeta>
<refnamediv >
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<refname > journald.conf</refname>
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<refpurpose > Journal service configuration file</refpurpose>
</refnamediv>
<refsynopsisdiv >
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<para > <filename > /etc/systemd/journald.conf</filename> </para>
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</refsynopsisdiv>
<refsect1 >
<title > Description</title>
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<para > This file configures various parameters of the
systemd journal service,
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<citerefentry > <refentrytitle > systemd-journald.service</refentrytitle> <manvolnum > 8</manvolnum> </citerefentry> .</para>
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</refsect1>
<refsect1 >
<title > Options</title>
<para > All options are configured in the
<literal > [Journal]</literal> section:</para>
<variablelist >
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<varlistentry >
<term > <varname > Storage=</varname> </term>
<listitem > <para > Controls where to
store journal data. One of
<literal > volatile</literal> ,
<literal > persistent</literal> ,
<literal > auto</literal> and
<literal > none</literal> . If
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<literal > volatile</literal> , journal
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log data will be stored only in
memory, i.e. below the
<filename > /run/log/journal</filename>
hierarchy (which is created if
needed). If
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<literal > persistent</literal> , data will
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be stored preferably on disk,
i.e. below the
<filename > /var/log/journal</filename>
hierarchy (which is created if
needed), with a fallback to
<filename > /run/log/journal</filename>
(which is created if needed), during
early boot and if the disk is not
writable. <literal > auto</literal> is
similar to
<literal > persistent</literal> but the
directory
<filename > /var/log/journal</filename>
is not created if needed, so that its
existence controls where log data
goes. <literal > none</literal> turns
off all storage, all log data received
will be dropped. Forwarding to other
targets, such as the console, the
kernel log buffer or a syslog daemon
will still work however. Defaults to
<literal > auto</literal> .</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > Compress=</varname> </term>
<listitem > <para > Takes a boolean
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value. If enabled (the default), data
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objects that shall be stored in the
journal and are larger than a certain
threshold are compressed with the XZ
compression algorithm before they are
written to the file
system.</para> </listitem>
</varlistentry>
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<varlistentry >
<term > <varname > Seal=</varname> </term>
<listitem > <para > Takes a boolean
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value. If enabled (the default), and a
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sealing key is available (as created
by
<citerefentry > <refentrytitle > journalctl</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> 's
<option > --setup-keys</option>
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command), Forward Secure Sealing (FSS)
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for all persistent journal files is
enabled. FSS is based on <ulink
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url="https://eprint.iacr.org/2013/397">Seekable
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Sequential Key Generators</ulink> by
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G. A. Marson and B. Poettering
(doi:10.1007/978-3-642-40203-6_7)
and may be used to protect journal files
from unnoticed alteration.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > SplitMode=</varname> </term>
<listitem > <para > Controls whether to
split up journal files per user. One
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of <literal > uid</literal> ,
<literal > login</literal> and
<literal > none</literal> . If
<literal > uid</literal> , all users will
get each their own journal files
regardless of whether they possess a
login session or not, however system
users will log into the system
journal. If <literal > login</literal> ,
actually logged-in users will get each
their own journal files, but users
without login session and system users
will log into the system journal. If
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<literal > none</literal> , journal files
are not split up by user and all
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messages are instead stored in the
single system journal. Note that
splitting up journal files by user is
only available for journals stored
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persistently. If journals are stored
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on volatile storage (see above), only
a single journal file for all user IDs
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is kept. Defaults to
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<literal > uid</literal> .</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > RateLimitInterval=</varname> </term>
<term > <varname > RateLimitBurst=</varname> </term>
<listitem > <para > Configures the rate
limiting that is applied to all
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messages generated on the system. If,
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in the time interval defined by
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<varname > RateLimitInterval=</varname> ,
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more messages than specified in
<varname > RateLimitBurst=</varname> are
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logged by a service, all further
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messages within the interval are
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dropped until the interval is over. A
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message about the number of dropped
messages is generated. This rate
limiting is applied per-service, so
that two services which log do not
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interfere with each other's
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limits. Defaults to 1000 messages in
30s. The time specification for
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<varname > RateLimitInterval=</varname>
may be specified in the following
units: <literal > s</literal> ,
<literal > min</literal> ,
<literal > h</literal> ,
<literal > ms</literal> ,
<literal > us</literal> . To turn off any
kind of rate limiting, set either
value to 0.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > SystemMaxUse=</varname> </term>
<term > <varname > SystemKeepFree=</varname> </term>
<term > <varname > SystemMaxFileSize=</varname> </term>
<term > <varname > RuntimeMaxUse=</varname> </term>
<term > <varname > RuntimeKeepFree=</varname> </term>
<term > <varname > RuntimeMaxFileSize=</varname> </term>
<listitem > <para > Enforce size limits on
the journal files stored. The options
prefixed with
<literal > System</literal> apply to the
journal files when stored on a
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persistent file system, more
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specifically
<filename > /var/log/journal</filename> . The
options prefixed with
<literal > Runtime</literal> apply to
the journal files when stored on a
volatile in-memory file system, more
specifically
<filename > /run/log/journal</filename> . The
former is used only when
<filename > /var</filename> is mounted,
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writable, and the directory
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<filename > /var/log/journal</filename>
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exists. Otherwise, only the latter
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applies. Note that this means that
during early boot and if the
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administrator disabled persistent
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logging, only the latter options apply,
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while the former apply if persistent
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logging is enabled and the system is
fully booted
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up. <command > journalctl</command> and
<command > systemd-journald</command>
ignore all files with names not ending
with <literal > .journal</literal> or
<literal > .journal~</literal> , so only
such files, located in the appropriate
directories, are taken into account
when calculating current disk usage.
</para>
<para > <varname > SystemMaxUse=</varname>
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and <varname > RuntimeMaxUse=</varname>
control how much disk space the
journald: do not free space when disk space runs low
Before, journald would remove journal files until both MaxUse= and
KeepFree= settings would be satisfied. The first one depends (if set
automatically) on the size of the file system and is constant. But
the second one depends on current use of the file system, and a spike
in disk usage would cause journald to delete journal files, trying to
reach usage which would leave 15% of the disk free. This behaviour is
surprising for the user who doesn't expect his logs to be purged when
disk usage goes above 85%, which on a large disk could be some
gigabytes from being full. In addition attempting to keep 15% free
provides an attack vector where filling the disk sufficiently disposes
of almost all logs.
Instead, obey KeepFree= only as a limit on adding additional files.
When replacing old files with new, ignore KeepFree=. This means that
if journal disk usage reached some high point that at some later point
start to violate the KeepFree= constraint, journald will not add files
to go above this point, but it will stay (slightly) below it. When
journald is restarted, it forgets the previous maximum usage value,
and sets the limit based on the current usage, so if disk remains to
be filled, journald might use one journal-file-size less on each
restart, if restarts happen just after rotation. This seems like a
reasonable compromise between implementation complexity and robustness.
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journal may use up at maximum.
<varname > SystemKeepFree=</varname> and
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<varname > RuntimeKeepFree=</varname>
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control how much disk space
journald: do not free space when disk space runs low
Before, journald would remove journal files until both MaxUse= and
KeepFree= settings would be satisfied. The first one depends (if set
automatically) on the size of the file system and is constant. But
the second one depends on current use of the file system, and a spike
in disk usage would cause journald to delete journal files, trying to
reach usage which would leave 15% of the disk free. This behaviour is
surprising for the user who doesn't expect his logs to be purged when
disk usage goes above 85%, which on a large disk could be some
gigabytes from being full. In addition attempting to keep 15% free
provides an attack vector where filling the disk sufficiently disposes
of almost all logs.
Instead, obey KeepFree= only as a limit on adding additional files.
When replacing old files with new, ignore KeepFree=. This means that
if journal disk usage reached some high point that at some later point
start to violate the KeepFree= constraint, journald will not add files
to go above this point, but it will stay (slightly) below it. When
journald is restarted, it forgets the previous maximum usage value,
and sets the limit based on the current usage, so if disk remains to
be filled, journald might use one journal-file-size less on each
restart, if restarts happen just after rotation. This seems like a
reasonable compromise between implementation complexity and robustness.
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systemd-journald shall leave free for
other uses.
<command > systemd-journald</command>
will respect both limits and use the
smaller of the two values.</para>
<para > The first pair defaults to 10%
and the second to 15% of the size of
the respective file system. If the
file system is nearly full and either
<varname > SystemKeepFree=</varname> or
<varname > RuntimeKeepFree=</varname> is
violated when systemd-journald is
started, the value will be raised to
percentage that is actually free. This
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means that if there was enough
free space before and journal files were
journald: do not free space when disk space runs low
Before, journald would remove journal files until both MaxUse= and
KeepFree= settings would be satisfied. The first one depends (if set
automatically) on the size of the file system and is constant. But
the second one depends on current use of the file system, and a spike
in disk usage would cause journald to delete journal files, trying to
reach usage which would leave 15% of the disk free. This behaviour is
surprising for the user who doesn't expect his logs to be purged when
disk usage goes above 85%, which on a large disk could be some
gigabytes from being full. In addition attempting to keep 15% free
provides an attack vector where filling the disk sufficiently disposes
of almost all logs.
Instead, obey KeepFree= only as a limit on adding additional files.
When replacing old files with new, ignore KeepFree=. This means that
if journal disk usage reached some high point that at some later point
start to violate the KeepFree= constraint, journald will not add files
to go above this point, but it will stay (slightly) below it. When
journald is restarted, it forgets the previous maximum usage value,
and sets the limit based on the current usage, so if disk remains to
be filled, journald might use one journal-file-size less on each
restart, if restarts happen just after rotation. This seems like a
reasonable compromise between implementation complexity and robustness.
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created, and subsequently something
else causes the file system to fill
up, journald will stop using more
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space, but it will not be removing
journald: do not free space when disk space runs low
Before, journald would remove journal files until both MaxUse= and
KeepFree= settings would be satisfied. The first one depends (if set
automatically) on the size of the file system and is constant. But
the second one depends on current use of the file system, and a spike
in disk usage would cause journald to delete journal files, trying to
reach usage which would leave 15% of the disk free. This behaviour is
surprising for the user who doesn't expect his logs to be purged when
disk usage goes above 85%, which on a large disk could be some
gigabytes from being full. In addition attempting to keep 15% free
provides an attack vector where filling the disk sufficiently disposes
of almost all logs.
Instead, obey KeepFree= only as a limit on adding additional files.
When replacing old files with new, ignore KeepFree=. This means that
if journal disk usage reached some high point that at some later point
start to violate the KeepFree= constraint, journald will not add files
to go above this point, but it will stay (slightly) below it. When
journald is restarted, it forgets the previous maximum usage value,
and sets the limit based on the current usage, so if disk remains to
be filled, journald might use one journal-file-size less on each
restart, if restarts happen just after rotation. This seems like a
reasonable compromise between implementation complexity and robustness.
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existing files to go reduce footprint
either.</para>
<para > <varname > SystemMaxFileSize=</varname>
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and
<varname > RuntimeMaxFileSize=</varname>
control how large individual journal
files may grow at maximum. This
influences the granularity in which
disk space is made available through
rotation, i.e. deletion of historic
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data. Defaults to one eighth of the
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values configured with
<varname > SystemMaxUse=</varname> and
<varname > RuntimeMaxUse=</varname> , so
that usually seven rotated journal
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files are kept as history. Specify
values in bytes or use K, M, G, T, P,
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E as units for the specified sizes
(equal to 1024, 1024²,... bytes).
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Note that size limits are enforced
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synchronously when journal files are
extended, and no explicit rotation
step triggered by time is
needed.</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <varname > MaxFileSec=</varname> </term>
<listitem > <para > The maximum time to
store entries in a single journal
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file before rotating to the next
one. Normally, time-based rotation
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should not be required as size-based
rotation with options such as
<varname > SystemMaxFileSize=</varname>
should be sufficient to ensure that
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journal files do not grow without
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bounds. However, to ensure that not
too much data is lost at once when old
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journal files are deleted, it might
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make sense to change this value from
the default of one month. Set to 0 to
turn off this feature. This setting
takes time values which may be
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suffixed with the units
<literal > year</literal> ,
<literal > month</literal> ,
<literal > week</literal> , <literal > day</literal> ,
<literal > h</literal> or <literal > m</literal>
to override the default time unit of
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seconds.</para> </listitem>
</varlistentry>
<varlistentry >
<term > <varname > MaxRetentionSec=</varname> </term>
<listitem > <para > The maximum time to
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store journal entries. This
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controls whether journal files
containing entries older then the
specified time span are
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deleted. Normally, time-based deletion
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of old journal files should not be
required as size-based deletion with
options such as
<varname > SystemMaxUse=</varname>
should be sufficient to ensure that
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journal files do not grow without
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bounds. However, to enforce data
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retention policies, it might make sense
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to change this value from the
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default of 0 (which turns off this
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feature). This setting also takes
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time values which may be suffixed with
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the units <literal > year</literal> ,
<literal > month</literal> ,
<literal > week</literal> , <literal > day</literal> ,
<literal > h</literal> or <literal > m</literal>
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to override the default time unit of
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seconds.</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <varname > SyncIntervalSec=</varname> </term>
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<listitem > <para > The timeout before
synchronizing journal files to
disk. After syncing, journal files are
placed in the OFFLINE state. Note that
syncing is unconditionally done
immediately after a log message of
priority CRIT, ALERT or EMERG has been
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logged. This setting hence applies
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only to messages of the levels ERR,
WARNING, NOTICE, INFO, DEBUG. The
default timeout is 5 minutes.
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</para> </listitem>
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</varlistentry>
<varlistentry >
<term > <varname > ForwardToSyslog=</varname> </term>
<term > <varname > ForwardToKMsg=</varname> </term>
<term > <varname > ForwardToConsole=</varname> </term>
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<term > <varname > ForwardToWall=</varname> </term>
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<listitem > <para > Control whether log
messages received by the journal
daemon shall be forwarded to a
traditional syslog daemon, to the
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kernel log buffer (kmsg), to the
system console, or sent as wall
messages to all logged-in users. These
options take boolean arguments. If
forwarding to syslog is enabled but no
syslog daemon is running, the
respective option has no effect. By
default, only forwarding to syslog and
wall is enabled. These settings may be
overridden at boot time with the
kernel command line options
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<literal > systemd.journald.forward_to_syslog=</literal> ,
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<literal > systemd.journald.forward_to_kmsg=</literal> ,
<literal > systemd.journald.forward_to_console=</literal>
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and
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<literal > systemd.journald.forward_to_wall=</literal> .
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When forwarding to the console, the
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TTY to log to can be changed
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with <varname > TTYPath=</varname> ,
described below.</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > MaxLevelStore=</varname> </term>
<term > <varname > MaxLevelSyslog=</varname> </term>
<term > <varname > MaxLevelKMsg=</varname> </term>
<term > <varname > MaxLevelConsole=</varname> </term>
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<term > <varname > MaxLevelWall=</varname> </term>
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<listitem > <para > Controls the maximum
log level of messages that are stored
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on disk, forwarded to syslog, kmsg,
the console or wall (if that is
enabled, see above). As argument,
takes one of
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<literal > emerg</literal> ,
<literal > alert</literal> ,
<literal > crit</literal> ,
<literal > err</literal> ,
<literal > warning</literal> ,
<literal > notice</literal> ,
<literal > info</literal> ,
<literal > debug</literal> or integer
values in the range of 0..7 (corresponding
to the same levels). Messages equal or below
the log level specified are
stored/forwarded, messages above are
dropped. Defaults to
<literal > debug</literal> for
<varname > MaxLevelStore=</varname> and
<varname > MaxLevelSyslog=</varname> , to
ensure that the all messages are
written to disk and forwarded to
syslog. Defaults to
<literal > notice</literal> for
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<varname > MaxLevelKMsg=</varname> ,
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<literal > info</literal> for
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<varname > MaxLevelConsole=</varname> and
<literal > emerg</literal> for
<varname > MaxLevelWall=</varname> .</para> </listitem>
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</varlistentry>
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<varlistentry >
<term > <varname > TTYPath=</varname> </term>
<listitem > <para > Change the console TTY
to use if
<varname > ForwardToConsole=yes</varname>
is used. Defaults to
<filename > /dev/console</filename> .</para> </listitem>
</varlistentry>
2012-03-16 02:25:14 +04:00
</variablelist>
</refsect1>
<refsect1 >
<title > See Also</title>
<para >
<citerefentry > <refentrytitle > systemd</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> ,
2012-06-01 03:05:38 +04:00
<citerefentry > <refentrytitle > systemd-journald.service</refentrytitle> <manvolnum > 8</manvolnum> </citerefentry> ,
2012-03-26 22:58:47 +04:00
<citerefentry > <refentrytitle > journalctl</refentrytitle> <manvolnum > 1</manvolnum> </citerefentry> ,
2012-04-04 00:31:48 +04:00
<citerefentry > <refentrytitle > systemd.journal-fields</refentrytitle> <manvolnum > 7</manvolnum> </citerefentry> ,
2013-02-11 23:42:24 +04:00
<citerefentry > <refentrytitle > systemd-system.conf</refentrytitle> <manvolnum > 5</manvolnum> </citerefentry>
2012-03-16 02:25:14 +04:00
</para>
</refsect1>
</refentry>
