syslogd.8

MSyslog是一个允许在Linux下运行的网络系统日志程序

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.\"     from: @(#)syslogd.8	8.1 (Berkeley) 6/6/93
.\"	$NetBSD: syslogd.8,v 1.3 1996/01/02 17:41:48 perry Exp $
.\"
.Dd June 6, 1993
.Dt SYSLOGD 8
.Os Core-SDI
.Sh NAME
modular
.Nm syslog daemon
.Nd log systems messages
.Sh SYNOPSIS
.Nm syslogd
.Op Fl c
.Op Fl u
.Op Fl n
.Op Fl A
.Op Fl d Ar level
.Op Fl f Ar config_file
.Op Fl m Ar mark_interval
.Op Fl a Ar path
.Op Fl p Ar log_socket
.Op Fl i Ar input
.Op Fl P Ar pidfile
.Sh DESCRIPTION
Modular
.Nm syslog
daemon reads and logs messages to the system console, log files, other
machines and/or users as specified by its configuration file. This
implementation was based on OpenBSD's syslog daemon.
.Pp
Supported command line options are:
.Bl -tag -width Ds
.It Fl d Ar level
Enable debugging to the standard output,
and do not disassociate from the controlling terminal. The
.Pa level
is a number used to differentiate error reports. Up to 10 reports all
critical errors that stop the daemon from working; up to 20 are the
serious errors that stop some input or output; up to 30 are noncritical
errors; up to 100 are warnings and potential errors; up to 200 are informative
messages; and finally up to 250 are all possible reporting on what is going
on.
.It Fl f Ar config_file
Specify the pathname of an alternate configuration file;
the default is
.Pa /etc/syslog.conf .
.It Fl m Ar mark_interval
Select the number of minutes between ``mark'' messages;
the default is 20 minutes.
.It Fl u
Allow the historical ``insecure'' mode, in which syslogd will
accept input from the UDP port as specified in
.Pa /etc/services .
Some software wants this, but you can be subjected to a variety of
attacks over the network, including attackers remotely filling logs.
.It Fl P Ar pidfile   
Specify an alternate pidfile.
.It Fl p Ar log_socket
Specify the pathname of an alternate log socket to be used instead;
the default is
.Pa /dev/log .
This option is deprecated by
.Fl i
option.
.It Fl a Pa path
Specify a location where
.Nm syslogd
should place an additional log socket.
The primary use for this is to place additional log sockets in
.Pa /dev/log
of various chroot filespaces. This option is predecated by
.Fl i
option.
.It Fl i Ar input_module [ module_arguments ]
Enables the specified input modules, see
.Xr im_* 8 .
.It Fl n
Disables opening default inputs when there aren't given on command line.
.It Fl c
Disables opening console device, useful for non root testing.
.It Fl A
Use local host name with it's domain.
.El
.Pp
.Nm Syslogd
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 Syslogd
creates the file
.Pa /var/run/syslog.pid ,
and stores its process
id there.
This can be used to kill or reconfigure
.Nm syslogd .
.Pp
The message sent to
.Nm syslogd
should consist of a single line.
The message can contain a priority code, which should be a preceding
decimal number in angle braces, for example,
.Sq Aq 5 .
This priority code should map into the priorities defined in the
include file
.Aq Pa sys/syslog.h .
.Sh EXAMPLES
To run modular
.Nm
on BSD systems you should:
.Pp
.Dl # syslogd
.Pp
with the command above two inputs modules are created,
.Cm bsd,
that reads BSD kernel messages from
.Pa /dev/klog,
and
.Cm unix,
opens
.Pa /dev/log
socket to log standard messages.
To run modular
.Nm
on Linux systems you should:
.Pp
.Dl # syslogd
.Pp
with the command above two inputs modules are created,
.Cm linux,
that reads linux kernel messages from
.Pa /dev/klog,
and
.Cm unix,
opens
.Pa /dev/log
socket to log standard messages.
.Sh FILES
.Bl -tag -width /var/run/syslog.pid -compact
.It Pa /etc/syslog.conf
The configuration file.
.It Pa /var/run/syslog.pid
The process id of current
.Nm syslogd .
.It Pa /dev/log
Name of the
.Tn UNIX
domain datagram log socket.
.It Pa /dev/klog
The kernel log device.
.El
.Sh SEE ALSO
.Xr syslog 3 ,
.Xr syslog.conf 5 ,
.Xr im_bsd 8 ,
.Xr im_doors 8 ,
.Xr im_linux 8 ,
.Xr im_streams 8 ,
.Xr im_tcp 8 ,
.Xr im_unix 8 ,
.Xr im_udp 8 ,
.Xr om_classic 8 ,
.Xr om_mysql 8 ,
.Xr om_peo 8 ,
.Xr om_pgsql 8 ,
.Xr om_regex 8 ,
.Xr om_tcp 8 ,
.Xr om_udp 8 ,
.Xr peochk 8 ,
.Xr syslogd 8
.Sh HISTORY
Modular
.Nm
is based on the original syslogd daemon appeared in
.Bx 4.3 .
.Sh BUGS
Submit bugs at this project's Sourceforge Bug reporting system at:
http://sourceforge.net/tracker/?func=add&group_id=25741&atid=385117
You may also report them directly to the authors; send an email to
[e-mail], describing the problem the most you can,
containing also machine description, hardware description, the
configuration file (/etc/syslog.conf), the OS description, and the
invoking command line.
The more you describe the bug, the faster we can fix it.