584 lines
20 KiB
Groff
584 lines
20 KiB
Groff
.\" -*- nroff -*-
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)syslog.conf.5 8.1 (Berkeley) 6/9/93
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.\" $FreeBSD$
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.\"
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.Dd February 21, 2021
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.Dt SYSLOG.CONF 5
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.Os sysklogd
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.Sh NAME
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.Nm syslog.conf
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.Nd configuration file format for
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.Xr syslogd 8
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.Sh DESCRIPTION
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The
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.Nm
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file is the configuration file for the
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.Xr syslogd 8
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program. It consists of lines of rules for logging, with each line
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containing at least two fields: the
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.Em selector
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field which specifies the types of messages and priorities to which the
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line applies, and an
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.Em action
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field which specifies the action to be taken if a message
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.Xr syslogd 8
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receives matches the selection criteria. A rule may also have an
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.Em option
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field for a setting that applies only to that rule.
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.Pp
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The fields are separated by one or more tab characters or spaces. A
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rule may be divided into several lines if the leading line ends with a
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single backslash ('\\') character.
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.Pp
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.Bd -literal -offset indent
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RULE := SELECTOR ACTION [;OPTION]
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SELECTOR := [SELECTOR;]facility[,facility].[!=]severity
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ACTION := /path/to/file
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|= |/path/to/named/pipe
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|= @remote[.host.tld][:PORT]
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OPTION := [OPTION,]
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|= RFC3164
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|= RFC5424
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|= rotate=SIZE:COUNT
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.Ed
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.Pp
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The
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.Em selector
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field specifies a pattern of facilities and priorities belonging to the
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specified action. The
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.Em action
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details where or what to do with the selected input. The
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.Em option
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field, which must start with the semi-colon option delimiter (';'),
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currently supports log formatting and log rotation. The default log
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format is the traditional RFC3164 (included here for completeness),
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.Sy except
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for remote syslog targets where the BSD format (without both timestamp
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and hostname) is the default. The user must explicitly set RFC3164 on
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a remote logging target. RFC5424 is the newest format with RFC3339 time
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stamps, msgid, structured data, and more. The BSD format cannot be set,
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it is only the default for remote targets for compatibility reasons.
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.Pp
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.Bl -tag -compact -width "RFC3164:"
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.It Sy BSD:
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.Li myproc[8710]: Kilroy was here.
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.It Sy RFC3164:
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.Li Aug 24 05:14:15 192.0.2.1 myproc[8710]: Kilroy was here.
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.It Sy RFC5424:
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.Li 2003-08-24T05:14:15.000003-07:00 192.0.2.1 myproc 8710 - - Kilroy was here.
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.El
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.Pp
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The log rotation, which is only relevant for files, details the max
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.Ar SIZE:COUNT
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a file can reach before it is rotated, and later compressed. This
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feature is mostly intended for embedded systems that do not want to have
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cron or a separate log rotate daemon.
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.Pp
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Comments, lines starting with a hash mark ('#'), and empty lines are
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ignored. If an error occurs during parsing the whole line is ignored.
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.Pp
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The special keyword
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.Em notify
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specifies the path to an executable program which will get called
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whenever a log file has been rotated, with the name of the file, less
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its rotation suffix
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.Ql .0 ,
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as an argument.
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For example:
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.Ql notify /sbin/on-log-rotate.sh .
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Any number of notifiers may be installed.
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.Pp
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A special
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.Em include
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keyword can be used to include all files with names ending in '.conf'
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and not beginning with a '.' contained in the directory following the
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keyword. This keyword can only be used in the first level configuration
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file. The included example
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.Pa /etc/syslog.conf
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has the following at the end:
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.Bd -literal -offset indent
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#
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# Drop your subsystem .conf file in /etc/syslog.d/
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#
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include /etc/syslog.d/*.conf
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.Ed
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.Pp
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Note that if you use spaces as separators, your
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.Nm
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might be incompatible with other Unices or Unix-like systems.
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This functionality was added for ease of configuration
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(e.g.\& it is possible to cut-and-paste into
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.Nm ) ,
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and to avoid possible mistakes.
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This change however preserves
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backwards compatibility with the old style of
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.Nm
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(i.e., tab characters only).
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.Sh SELECTORS
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The selector field consists of two parts, a
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.Em facility
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and a
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.Em priority ,
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separated by a period ('.'). Both parts are case insensitive and can
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also be specified as decimal numbers corresponding to the definitions in
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.Pa /usr/include/syslog.h .
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It is safer to use symbolic names rather than decimal numbers. Both
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facilities and priorities are described in
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.Xr syslogp 3 .
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The names mentioned below correspond to the similar
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.Ql LOG_FOO
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values in
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.Pa /usr/include/syslog.h .
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.Pp
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The
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.Em facility
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is one of the following keywords:
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.Bl -column "Code" "Facility" "Description" -offset indent
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.It Sy "Code" Ta Sy "Facility" Ta Sy "Description"
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.It 0 Ta kern Ta Kernel log messages
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.It 1 Ta user Ta User-level messages
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.It 2 Ta mail Ta Mail system
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.It 3 Ta daemon Ta General system daemons
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.It 4 Ta auth Ta Security/authorization messages
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.It 5 Ta syslog Ta Messages generated by syslogd
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.It 6 Ta lpr Ta Line printer subsystem
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.It 7 Ta news Ta Network news subsystem
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.It 8 Ta uucp Ta UNIX-to-UNIX copy
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.It 9 Ta cron Ta Clock/cron daemon (BSD, Linux)
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.It 10 Ta authpriv Ta Security/authorization messages (private)
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.It 11 Ta ftp Ta FTP daemon
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.It 12 Ta ntp Ta NTP subsystem
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.It 13 Ta security Ta Log audit
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.It 14 Ta console Ta Log alert
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.It 15 Ta unused Ta Clock/cron daemon (Solaris)
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.It 16 Ta local0 Ta Reserved for local/system use
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.It 17 Ta local1 Ta Reserved for local/system use
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.It 18 Ta local2 Ta Reserved for local/system use
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.It 19 Ta local3 Ta Reserved for local/system use
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.It 20 Ta local4 Ta Reserved for local/system use
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.It 21 Ta local5 Ta Reserved for local/system use
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.It 22 Ta local6 Ta Reserved for local/system use
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.It 23 Ta local7 Ta Reserved for local/system use
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.El
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.Pp
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Notice, several of the above listed facilities are not supported by the
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standard C library (GLIBC, musl libc, or uClibc) on Linux. libsyslog,
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shipped with
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.Nm sysklogd ,
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however, supports all the above facilities in full. Also, the keyword
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.Ql mark
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is only for internal use and should therefore not be used in
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applications. The
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.Em facility
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specifies the subsystem that produced the message, e.g. all mail
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programs log with the mail facility,
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.Ql LOG_MAIL ,
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if they log using syslog.
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.Pp
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|
In most cases anyone can log to any facility, so we rely on convention
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for the correct facility to be chosen. However, generally only the
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kernel can log to the
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.Ql kern
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facility. This because the implementation of
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.Xr openlog 3
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and
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|
.Xr syslog 3
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|
in GLIBC does not allow logging to the
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.Ql kern
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facility.
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.Pp
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|
The
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.Em priority
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is one of the following keywords, in ascending order:
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.Bl -column "Code" "Facility" "Description" -offset indent
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.It Sy "Value" Ta Sy "Severity" Ta Sy "Description"
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.It 0 Ta emergency Ta System is unusable
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.It 1 Ta alert Ta Action must be taken immediately
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.It 2 Ta critical Ta Critical conditions
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.It 3 Ta error Ta Error conditions
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.It 4 Ta warning Ta Warning conditions
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.It 5 Ta notice Ta Normal but significant conditions
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.It 6 Ta info Ta Informational messages
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.It 7 Ta debug Ta Debug-level messages
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.El
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|
.Pp
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|
The default log level of most applications is
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|
.Ql notice ,
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|
meaning only
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|
.Ql notice
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|
and above are forwarded to
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|
.Nm syslogd .
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|
See
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|
.Xr setlogmask 3
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|
for more information on how to change the default log level of your
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|
application.
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|
.Pp
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|
In addition to the above mentioned facility and priority names,
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|
.Xr syslogd 8
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understands the following extensions:
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.Pp
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.Bl -tag -compact -width "'none'"
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.It *
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An asterisk ('*') matches all facilities or all priorities, depending on
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where it is used (before or after the period).
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|
.It none
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The keyword
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.Ql none
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stands for no priority of the given facility.
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.It ,
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Multiple facilities may be specified for a single priority pattern in
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one statement using the comma (',') operator to separate the facilities.
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You may specify as many facilities as you want. Please note that only
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the facility part from such a statement is taken, a priority part would
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be ignored.
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.It ;
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Multiple selectors may be specified for a single
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.Em action
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using the semicolon (';') separator. Selectors are processed from left
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to right, with each selector being able to overwrite preceding ones.
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|
Using this behavior you are able to exclude some priorities from the
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pattern.
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.It =
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This version of
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.Xr syslogd 8
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has a syntax extension to the original BSD source, which makes its use
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more intuitive. You may precede every priority with an equation sign
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('=') to specify that only this single priority should be matched,
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instead of the default: this priority and all higher priorities.
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|
.It !
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|
You may also precede the priority with an exclamation mark ('!') if you
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want to ignore this priority and all higher priorities. You may even
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use both the exclamation mark and the equation sign if you want to
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ignore a single priority. If both extensions are used, the exclamation
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mark must occur before the equation sign.
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.El
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.Sh ACTIONS
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The action field of a rule is the destination or target for a match. It
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can be a file, a UNIX named pipe, the console, or a remote machine.
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.Ss Regular File
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|
Typically messages are logged to real files. The filename is specified
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with an absolute path name.
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.Pp
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|
You may prefix each entry with a minus sign ('-') to avoid syncing the
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file after each log message. Note that you might lose information if
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the system crashes right after a write attempt. Nevertheless this might
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give you back some performance, especially if you run programs that use
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logging in a very verbose manner.
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.Ss Named Pipes
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This version of
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.Xr syslogd 8
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supports logging to named pipes (FIFOs). A FIFO, or named pipe, can be
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used as a destination for log messages by prepending a pipe symbol ('|')
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to the name of the file. This can be very handy for debugging. Note
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that the FIFO must be created with the
|
|
.Xr mkfifo 1
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command before
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.Nm syslogd
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is started.
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.Ss Terminal and Console
|
|
If the file you specified is a tty, special tty-handling is done, same
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with
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.Pa /dev/console .
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.Ss Remote Machine
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|
Full remote logging support is available in
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.Nm syslogd ,
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i.e. to send messages to a remote syslog server, and and to receive
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messages from remote hosts. To forward messages to another host,
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prepend the hostname with the at sign ('@'). If a port number is added
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after a colon (':') then that port will be used as the destination port
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rather than the usual syslog port.
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.Pp
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This feature makes it possible to collect all syslog messages in a
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network on a central host. This reduces administration needs and
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can be really helpful when debugging distributed systems.
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.Pp
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Using a named pipe log method, messages from remote hosts can be sent to
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a log program. By reading log messages line by line such a program is
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able to sort log messages by host name or program name on the central
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log host. This way it is possible to split the log into separate files.
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.Pp
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By default messages to remote remote hosts were formatted in the original
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BSD style, without timestamp or hostname. As of
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.Nm syslogd
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v2.0 the default includes timestamp and hostname. It is also possible to
|
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enable the new RFC5424 style formatting, append ';RFC5424' after the
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hostname.
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.Ss List of Users
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Usually critical messages are also directed to
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.Ql root
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on that machine. You can specify a list of users that ought to receive
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the log message on their terminal by writing their usernames. You may
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specify more than one user by separating the usernames with commas
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(','). Only logged in users will receive the log messages.
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.Ss Everyone logged on
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Emergency messages often go to all users currently online to notify them
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that something strange is happening with the system. To specify this
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.Xr wall 1
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feature use an asterisk ('*').
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.Sh IMPLEMENTATION NOTES
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The
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.Dq kern
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facility is usually reserved for messages
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generated by the local kernel.
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|
Other messages logged with facility
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.Dq kern
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are usually translated to facility
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.Dq user .
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This translation can be disabled;
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see
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.Xr syslogd 8
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for details.
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.Sh FILES
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.Bl -tag -width /etc/syslog.d/*.conf -compact
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.It Pa /etc/syslog.conf
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.Xr syslogd 8
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configuration file
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.It /etc/syslog.d/*.conf
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Recommended directory for .conf snippets
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.El
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.Sh EXAMPLES
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This section lists some examples, partially from actual site setups.
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.Ss Catch Everything
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This example matches all facilities and priorities and stores everything
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in the file
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.Pa /var/log/syslog
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in RFC5424 format. Every time the file reaches 10 MiB it is rotated and
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five files in total are kept, including the non-rotated file.
|
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.Bd -literal -offset indent
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|
# Match all log messages, store in RC5424 format and rotate every 10 MiB
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#
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*.* /var/log/critical ;rotate=10M:5,RFC5424
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.Ed
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|
.Ss Critical
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|
This stores all messages of priority
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|
.Ql crit
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|
in the file
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|
.Pa /var/log/critical ,
|
|
with the exception of any kernel messages.
|
|
.Bd -literal -offset indent
|
|
# Store critical stuff in critical
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|
#
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*.=crit;kern.none /var/log/critical
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.Ed
|
|
.Ss Kernel
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This is an example of the 2nd selector overwriting part of the first
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|
one. The first selector selects kernel messages of priority
|
|
.Ql info
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|
and higher. The second selector filters out kernel messages of priority
|
|
.Ql error
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|
and higher. This leaves just priorities
|
|
.Ql info ,
|
|
.Ql notice ,
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|
and
|
|
.Ql warning
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|
to get logged.
|
|
.Bd -literal -offset indent
|
|
# Kernel messages are stored in the kernel file, critical messages and
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|
# higher ones also go to another host and to the console
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|
#
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|
kern.* /var/log/kernel
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|
kern.crit @arpa.berkeley.edu ;RFC5424
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kern.crit /dev/console
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kern.info;kern.!err /var/log/kernel.info
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.Ed
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|
.Pp
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|
The first rule directs any message that has the kernel facility to the
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|
file
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|
.Pa /var/log/kernel .
|
|
Recall that only the kernel itself can log to this facility.
|
|
.Pp
|
|
The second statement directs all kernel messages of priority
|
|
.Ql crit
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|
and higher to the remote host
|
|
.Ql arpa.berkeley.edu
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|
in RFC5424 style formatting. This is useful, because if the host
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|
crashes and the disks get irreparable errors you might not be able to
|
|
read the stored messages. If they're on a remote host, too, you still
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|
can try to find out the reason for the crash.
|
|
.Pp
|
|
The third rule directs kernel messages of priority
|
|
.Ql crit
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|
and higher to the actual console, so the person who works on the machine
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|
will get them, too.
|
|
.Pp
|
|
The fourth line tells
|
|
.Nm syslogd
|
|
to save all kernel messages that come with priorities from
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|
.Ql info
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|
up to
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|
.Ql warning
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|
in the file
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|
.Pa /var/log/kernel.info .
|
|
.Ss Redirecting to a TTY
|
|
This directs all messages that use
|
|
.Ql mail.info
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|
(in source
|
|
.Ql LOG_MAIL | LOG_INFO )
|
|
to
|
|
.Pa /dev/tty12 ,
|
|
the 12th console. For example the tcpwrapper
|
|
.Xr tcpd 8
|
|
uses this as its default.
|
|
.Bd -literal -offset indent
|
|
# The tcp wrapper logs with mail.info, we display
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|
# all the connections on tty12
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|
#
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|
mail.=info /dev/tty12
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|
.Ed
|
|
.Ss Redirecting to a file
|
|
This pattern matches all messages that come with the
|
|
.Ql mail
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|
facility, except for the
|
|
.Ql info
|
|
priority. These will be stored in the file
|
|
.Pa /var/log/mail .
|
|
.Bd -literal -offset indent
|
|
# Write all mail related logs to a file
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|
#
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|
mail.*;mail.!=info /var/log/mail
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|
.Ed
|
|
.Ss Single Priority from Two Facilities
|
|
This will extract all messages that come either with
|
|
.Ql mail.info
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|
or with
|
|
.Ql news.info
|
|
and store them in the file
|
|
.Pa /var/log/info .
|
|
.Bd -literal -offset indent
|
|
# Log all mail.info and news.info messages to info
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|
#
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|
mail,news.=info /var/log/info
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|
.Ed
|
|
.Ss Advanced Filtering, part 1
|
|
This logs all messages that come with either the
|
|
.Ql info
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|
or the
|
|
.Ql notice
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|
priority into the file
|
|
.Pa /var/log/messages ,
|
|
except for all messages that use the
|
|
.Ql mail
|
|
facility.
|
|
.Bd -literal -offset indent
|
|
# Log info and notice messages to messages file
|
|
#
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|
*.=info;*.=notice;\\
|
|
mail.none /var/log/messages
|
|
.Ed
|
|
.Ss Advanced Filtering, part 2
|
|
This statement logs all messages that come with the
|
|
.Ql info
|
|
priority to the file
|
|
.Pa /var/log/messages .
|
|
But any message with either
|
|
.Ql mail
|
|
or the
|
|
.Ql news
|
|
facility are not logged.
|
|
.Bd -literal -offset indent
|
|
# Log info messages to messages file
|
|
#
|
|
*.=info;\\
|
|
mail,news.none /var/log/messages
|
|
.Ed
|
|
.Ss Wall Messages
|
|
This rule tells
|
|
.Nm syslogd
|
|
to write all emergency messages to all currently logged in users. This
|
|
is the wall action.
|
|
.Bd -literal -offset indent
|
|
# Emergency messages will be displayed using wall
|
|
#
|
|
*.=emerg *
|
|
.Ed
|
|
.Ss Alerting Users
|
|
This rule directs all messages of priority
|
|
.Ql alert
|
|
or higher to the terminals of the operator, i.e. of the users 'root'
|
|
and 'eric', if they're logged in.
|
|
.Bd -literal -offset indent
|
|
# Any logged in root user and Eric get alert and higher messages.
|
|
#
|
|
*.alert root,eric
|
|
.Ed
|
|
.Ss Log Rotation
|
|
This example logs all messages except kernel messages to the file
|
|
.Pa /var/log/messages
|
|
without syncing ('-') the file after each log message. When the file
|
|
reaches 100 kiB it is rotated. In total are only 10 rotated files,
|
|
including the main file itself and compressed files kept. The size
|
|
argument takes the same modifiers as the
|
|
.Xr syslogd 8
|
|
command line option,
|
|
.Fl r .
|
|
.Bd -literal -offset indent
|
|
# Log all messages, including kernel, to the messages file rotate it
|
|
# every 100 kiB and keep up to 10 aged out, and compressed, files.
|
|
#
|
|
*.*;kern.none -/var/log/messages ;rotate=100k:10
|
|
.Ed
|
|
.Ss Logging to Remote Syslog Server
|
|
This rule redirects all messages to one remote host called
|
|
.Ql finlandia ,
|
|
with RFC5424 style formatting, and another remote host called
|
|
.Ql sibelius ,
|
|
but on a non-standard port and with RFC3164 formatting (i.e.,
|
|
including timestamp and hostname).
|
|
.Bd -literal -offset indent
|
|
*.* @finlandia ;RFC5424
|
|
*.* @sibelius:5514 ;RFC3164
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr syslog 3 ,
|
|
.Xr syslogd 8
|
|
.Sh BUGS
|
|
The effects of multiple
|
|
.Em selectors
|
|
are sometimes not intuitive.
|
|
For example
|
|
.Dq mail.crit,*.err
|
|
will select
|
|
.Dq mail
|
|
facility messages at the level of
|
|
.Dq err
|
|
or higher, not at the level of
|
|
.Dq crit
|
|
or higher.
|
|
.Pp
|
|
In networked environments, note that not all operating systems
|
|
implement the same set of facilities.
|
|
The facilities
|
|
authpriv, cron, ftp, and ntp that are known to this implementation
|
|
might be absent on the target system.
|
|
Even worse, DEC UNIX uses
|
|
facility number 10 (which is authpriv in this implementation) to
|
|
log events for their AdvFS file system.
|