\"      $NetBSD: syslogd.8,v 1.61 2025/06/05 14:47:13 christos Exp $
\"
\" Copyright (c) 1983, 1986, 1991, 1993
\"      The Regents of the University of California.  All rights reserved.
\"
\" Redistribution and use in source and binary forms, with or without
\" modification, are permitted provided that the following conditions
\" are met:
\" 1. Redistributions of source code must retain the above copyright
\"    notice, this list of conditions and the following disclaimer.
\" 2. Redistributions in binary form must reproduce the above copyright
\"    notice, this list of conditions and the following disclaimer in the
\"    documentation and/or other materials provided with the distribution.
\" 3. Neither the name of the University nor the names of its contributors
\"    may be used to endorse or promote products derived from this software
\"    without specific prior written permission.
\"
\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\" SUCH DAMAGE.
\"
\"     from: @(#)syslogd.8      8.1 (Berkeley) 6/6/93
\"
Dd June 5, 2025
Dt SYSLOGD 8
Os
Sh NAME
Nm syslogd
Nd log systems messages
Sh SYNOPSIS
Nm
Op Fl knrSsTUvX
Op Fl B Ar buffer_length
Op Fl b Ar bind_address
Op Fl d Op Oo Cm \&~ Oc Ns Ar what
Op Fl f Ar config_file
Op Fl g Ar group
Op Fl m Ar mark_interval
Op Fl o Ar output_format
Op Fl P Ar file_list
Oo
Fl p Ar log_socket
Op Fl p Ar log_socket2 ...
Oc
Op Fl t Ar chroot_dir
Op Fl u Ar user
Sh DESCRIPTION
Nm
reads and logs messages to the system console, log files, other
machines and/or users as specified by its configuration file.
The options are as follows:
Bl -tag -width 15n
It Fl B Ar buffer_length
Sets the receiving buffer length.
The default is 16384 bytes.
If syslogd reports buffer overflow, this needs increasing.
If you don't care about it being reported, see the
Fl X
option.
It Fl b Ar bind_address
Specify one specific IP address or hostname to bind to.
If a hostname is specified, the IPv4 or IPv6 address
which corresponds to it is used.
It Fl d Op Oo Cm \&~ Oc Ns Ar what
Do not disassociate from the controlling terminal and
enable debugging to the standard output.
The optional
Ar what
argument is a number that selects which categories of the debug
messages are to be enabled.
A tilde
Pq Sq Cm \&~
before
Ar what
inverts its meaning so that all messages except those selected by
Ar what
are enabled.
It Fl f Ar config_file
Specify the pathname of an alternative configuration file;
the default is
Pa /etc/syslog.conf .
It Fl g Ar group
Set GID to
Ar group
after the sockets and log files have been opened.
It Fl k
Disable the translation of (remote) messages received with facility
Dq kern
to facility
Dq user .
Usually the
Dq kern
facility is reserved for messages read directly from
Pa /dev/klog .
It Fl m Ar mark_interval
Select the number of minutes between ``mark'' messages;
the default is 20 minutes.
It Fl n
Do not perform hostname lookups; report only numeric addresses.
It Fl o Ar output_format
Select output message format.
Bl -hang
It Em bsd , rfc3164
traditional BSD Syslog format (default)
It Em syslog , rfc5424
new syslog-protocol format
El
It Fl P
Specify the pathname of a file containing a list of sockets to be
created.
The format of the file is simply one socket per line.
It Fl p Ar log_socket
Specify the pathname of a log socket.
Multiple
Fl p
options create multiple log sockets.
If no
Fl p
arguments are given, the default socket of
Pa /var/run/log
is used.
It Fl r
Disable the compression of repeated instances of the same line
into a single line of the form
Dq last message repeated N times .
It Fl S
Sync kernel messages to disk immediately.
It Fl s
Select
Dq secure
mode, in which
Nm
does not listen on a UDP socket but only communicates over a
Ux
domain socket.
This is valuable when the machine on
which
Nm
runs is subject to attack over the network and it is desired
that the machine be protected from attempts to remotely fill logs
and similar attacks.
It Fl T
Always use the local time and date for messages received from the
network, instead of the timestamp field supplied in the message
by the remote host.
This is useful if some of the originating hosts can't keep time
properly or are unable to generate a correct timestamp.
It Fl t Ar chroot_dir
Xr chroot 2
to
Ar chroot_dir
after the sockets and log files have been opened.
It Fl U
Unique priority logging.
Only log messages at the priority specified by the selector in the
configuration file.
Without this option, messages at the specified priority or higher are
logged.
This option changes the default priority comparison from
Sq >=
to
Sq = .
It Fl u Ar user
Set UID to
Ar user
after the sockets and log files have been opened.
It Fl v
Verbose logging.
If specified once, the numeric facility and priority are logged with
each locally-written message.
If specified more than once, the names of the facility and priority are
logged with each locally-written message.
It Fl X
Disable logging of buffer overflow.
El
Pp
Nm
reads its configuration file when it starts up and whenever it
receives a hangup signal.
For information on the format of the configuration file,
see
Xr syslog.conf 5 .
Pp
Nm
reads messages from the
Ux
domain socket
Pa /var/run/log ,
from an Internet domain socket specified in
Pa /etc/services ,
and from the special device
Pa /dev/klog
(to read kernel messages).
Pp
Nm
creates the file
Pa /var/run/syslogd.pid ,
and stores its process
id there.
This can be used to kill or reconfigure
Nm .
Pp
By using multiple
Fl p
options, one can set up many chroot environments by passing the pathname
to the log socket
Pa ( /var/run/log )
in each chroot area to
Nm .
For example:
Dl syslogd -p /var/run/log -p /web/var/run/log -p /ftp/var/run/log
Pp
Note: the normal log socket must now also be passed to
Nm .
Pp
The logged message includes the date, time, and hostname (or pathname of
the log socket).
Commonly, the program name and the process id is included.
Pp
The date and time are taken from the received message.
If the format of the timestamp field is incorrect, time obtained from
the local host is used instead.
This can be overridden by the
Fl T
flag.
Pp
Accesses from UDP socket can be filtered by libwrap configuration files, like
Pa /etc/hosts.deny .
Specify
Dq Li syslogd
in
Ar daemon_list
portion of the configuration files.
Refer to
Xr hosts_access 5
for details.
Ss SYSLOG PROTOCOL NOTES
Nm
accepts messages in traditional BSD Syslog or in newer Syslog Protocol
format.
See RFC 3164 (BSD Syslog) and RFC 5424 (Syslog Protocol) for detailed
description of the message format.
Messages from the local kernel that are not tagged with a priority code
receive the default facility
Dv LOG_KERN
and priority
Dv LOG_NOTICE .
All other untagged messages receive the default facility
Dv LOG_USER
and priority
Dv LOG_NOTICE .
Sh FILES
Bl -tag -width /var/run/syslogd.pid -compact
It Pa /etc/syslog.conf
The configuration file.
It Pa /var/run/syslogd.pid
The process id of current
Nm .
It Pa /var/run/log
Name of the
Ux
domain datagram log socket.
It Pa /dev/klog
The kernel log device.
El
Sh SEE ALSO
Xr logger 1 ,
Xr syslog 3 ,
Xr services 5 ,
Xr syslog.conf 5 ,
Xr newsyslog 8
Rs
%R RFC
%N 3164
%D August 2001
%T The BSD syslog Protocol
Re
Rs
%R RFC
%N 5424
%D March 2009
%T The Syslog Protocol
Re
Sh HISTORY
The
Nm
command appeared in
Bx 4.3 .
Support for multiple log sockets appeared in
Nx 1.4 .
libwrap support appeared in
Nx 1.6 .
Support for RFC 5424, TLS encryption and authentication, signed messages
appeared in
Nx 6.0 .
Sh CAVEATS
Nm
does not create files,
it only logs to existing ones.

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.