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man: document the kernel command line options to use when logging to kmsg

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Prompted by:

https://lists.freedesktop.org/archives/systemd-devel/2019-July/043149.html
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Lennart Poettering 2019-07-29 09:24:09 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 08b5953997
commit 77ce88c128
1 changed files with 17 additions and 13 deletions
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30
man/journald.conf.xml
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@ -288,21 +288,25 @@
<term><varname>ForwardToConsole=</varname></term> <term><varname>ForwardToConsole=</varname></term>
<term><varname>ForwardToWall=</varname></term> <term><varname>ForwardToWall=</varname></term>
<listitem><para>Control whether log messages received by the journal daemon shall <listitem><para>Control whether log messages received by the journal daemon shall be forwarded to a
be forwarded to a traditional syslog daemon, to the kernel log buffer (kmsg), to traditional syslog daemon, to the kernel log buffer (kmsg), to the system console, or sent as wall
the system console, or sent as wall messages to all logged-in users. These messages to all logged-in users. These options take boolean arguments. If forwarding to syslog is
options take boolean arguments. If forwarding to syslog is enabled but nothing enabled but nothing reads messages from the socket, forwarding to syslog has no effect. By default,
reads messages from the socket, forwarding to syslog has no effect. By default, only forwarding to wall is enabled. These settings may be overridden at boot time with the kernel
only forwarding to wall is enabled. These settings may be overridden at boot time command line options <literal>systemd.journald.forward_to_syslog</literal>,
with the kernel command line options
<literal>systemd.journald.forward_to_syslog</literal>,
<literal>systemd.journald.forward_to_kmsg</literal>, <literal>systemd.journald.forward_to_kmsg</literal>,
<literal>systemd.journald.forward_to_console</literal>, and <literal>systemd.journald.forward_to_console</literal>, and
<literal>systemd.journald.forward_to_wall</literal>. If the option name is <literal>systemd.journald.forward_to_wall</literal>. If the option name is specified without
specified without <literal>=</literal> and the following argument, true is <literal>=</literal> and the following argument, true is assumed. Otherwise, the argument is parsed
assumed. Otherwise, the argument is parsed as a boolean. When forwarding to the as a boolean.</para>
console, the TTY to log to can be changed with <varname>TTYPath=</varname>,
described below.</para></listitem> <para>When forwarding to the console, the TTY to log to can be changed with
<varname>TTYPath=</varname>, described below.</para>
<para>When forwarding to the kernel log buffer (kmsg), make sure to select a suitably large size for
the log buffer, and ensure the kernel's rate-limiting applied to userspace processes is turned
off. Specifically, add <literal>log_buf_len=8M</literal> and <literal>printk.devkmsg=on</literal> (or
similar) to the kernel command line.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry> <varlistentry>