From 24d007a0a8a77a6b75c6c7a403fc8d107875ebdc Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>

Date: Sat, 9 May 2015 16:20:51 -0500

Subject: [PATCH] man: document forwarding to syslog better

https://bugzilla.redhat.com/show_bug.cgi?id=1147651

Cherry-picked from: 589532d0

Resolves: #1177336

---

 man/journald.conf.xml | 70 +++++++++++++++++++++++++++----------------

 1 file changed, 44 insertions(+), 26 deletions(-)

diff --git a/man/journald.conf.xml b/man/journald.conf.xml

index 85146b0d82..abfe3130dd 100644

--- a/man/journald.conf.xml

+++ b/man/journald.conf.xml

@@ -97,7 +97,7 @@

         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

+        the console, the kernel log buffer, or a syslog socket will

         still work however. Defaults to

         <literal>auto</literal>.</para></listitem>

       </varlistentry>

@@ -220,27 +220,19 @@

         journald will stop using more space, but it will not be

         removing existing files to go reduce footprint either.</para>

-        <para><varname>SystemMaxFileSize=</varname>

-        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

-        data. Defaults to one eighth of the

-        values configured with

+        <para><varname>SystemMaxFileSize=</varname> 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 data. Defaults to one

+        eighth of the values configured with

         <varname>SystemMaxUse=</varname> and

-        <varname>RuntimeMaxUse=</varname>, so

-        that usually seven rotated journal

-        files are kept as history. Specify

-        values in bytes or use K, M, G, T, P,

-        E as units for the specified sizes

-        (equal to 1024, 1024²,... bytes).

-        Note that size limits are enforced

-        synchronously when journal files are

-        extended, and no explicit rotation

-        step triggered by time is

+        <varname>RuntimeMaxUse=</varname>, so that usually seven

+        rotated journal files are kept as history. Specify values in

+        bytes or use K, M, G, T, P, E as units for the specified sizes

+        (equal to 1024, 1024²,... bytes).  Note that size limits are

+        enforced synchronously when journal files are extended, and no

+        explicit rotation step triggered by time is

         needed.</para></listitem>

       </varlistentry>

@@ -308,13 +300,13 @@

         daemon, to the 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 wall is

-        enabled. These settings may be overridden at boot time with

-        the kernel command line options

+        is enabled but nothing 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 command line options

         <literal>systemd.journald.forward_to_syslog=</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>. When

         forwarding to the console, the TTY to log to can be changed

         with <varname>TTYPath=</varname>, described

@@ -365,6 +357,32 @@

   </refsect1>

+  <refsect1>

+    <title>Forwarding to traditional syslog daemons</title>

+

+    <para>

+      Journal events can be transfered to a different logging daemon

+      in two different ways. In the first method, messages are

+      immediately forwarded to a socket

+      (<filename>/run/systemd/journal/syslog</filename>), where the

+      traditional syslog daemon can read them. This method is

+      controlled by <varname>ForwardToSyslog=</varname> option.  In a

+      second method, a syslog daemon behaves like a normal journal

+      client, and reads messages from the journal files, similarly to

+      <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.

+      In this method, messages do not have to be read immediately,

+      which allows a logging daemon which is only started late in boot

+      to access all messages since the start of the system. In

+      addition, full structured meta-data is available to it. This

+      method of course is available only if the messages are stored in

+      a journal file at all. So it will work if

+      <varname>Storage=none</varname> is set. It should be noted that

+      usualy the <emphasis>second</emphasis> method is used by syslog

+      daemons, so the <varname>Storage=</varname> option, and not the

+      <varname>ForwardToSyslog=</varname> option, is relevant for them.

+    </para>

+  </refsect1>

+

   <refsect1>

       <title>See Also</title>

       <para>