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NetBSD 6.1.5 - man page for syslogd (netbsd section 8)

SYSLOGD(8)			   BSD System Manager's Manual			       SYSLOGD(8)

NAME
     syslogd -- log systems messages

SYNOPSIS
     syslogd [-dnrSsTUv] [-b bind_address] [-f config_file] [-g group] [-m mark_interval]
	     [-o output_format] [-P file_list] [-p log_socket [-p log_socket2 ...]]
	     [-t chroot_dir] [-u user]

DESCRIPTION
     syslogd 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:

     -b 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.

     -d 	      Enable debugging to the standard output, and do not disassociate from the
		      controlling terminal.

     -f config_file   Specify the pathname of an alternative configuration file; the default is
		      /etc/syslog.conf.

     -g group	      Set GID to group after the sockets and log files have been opened.

     -m mark_interval
		      Select the number of minutes between ``mark'' messages; the default is 20
		      minutes.

     -n 	      Do not perform hostname lookups; report only numeric addresses.

     -o output_format
		      Select output message format.

		      rfc3164 traditional BSD Syslog format (default)

		      syslog  new syslog-protocol format

     -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.

     -p log_socket    Specify the pathname of a log socket.  Multiple -p options create multiple
		      log sockets.  If no -p arguments are created, the default socket of
		      /var/run/log is used.

     -r 	      Disable the compression of repeated instances of the same line into a sin-
		      gle line of the form ``last message repeated N times''.

     -S 	      Sync kernel messages to disk immediately.

     -s 	      Select ``secure'' mode, in which syslogd does not listen on a UDP socket
		      but only communicates over a UNIX domain socket.	This is valuable when the
		      machine on which syslogd 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.

     -t chroot_dir    chroot(2) to chroot_dir after the sockets and log files have been opened.

     -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.

     -u user	      Set UID to user after the sockets and log files have been opened.

     -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 '>=' to '='.

     -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.

     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 syslog.conf(5).

     syslogd reads messages from the UNIX domain socket /var/run/log, from an Internet domain
     socket specified in /etc/services, and from the special device /dev/klog (to read kernel
     messages).

     syslogd creates the file /var/run/syslogd.pid, and stores its process id there.  This can be
     used to kill or reconfigure syslogd.

     By using multiple -p options, one can set up many chroot environments by passing the path-
     name to the log socket (/var/run/log) in each chroot area to syslogd.  For example:
	   syslogd -p /var/run/log -p /web/var/run/log -p /ftp/var/run/log

     Note: the normal log socket must now also be passed to syslogd.

     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.

     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 -T flag.

     Accesses from UDP socket can be filtered by libwrap configuration files, like
     /etc/hosts.deny.  Specify ``syslogd'' in daemon_list portion of the configuration files.
     Refer to hosts_access(5) for details.

   SYSLOG PROTOCOL NOTES
     syslogd 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 LOG_KERN and priority LOG_NOTICE.  All other untagged messages receive the
     default facility LOG_USER and priority LOG_NOTICE.

FILES
     /etc/syslog.conf	   The configuration file.
     /var/run/syslogd.pid  The process id of current syslogd.
     /var/run/log	   Name of the UNIX domain datagram log socket.
     /dev/klog		   The kernel log device.

SEE ALSO
     logger(1), syslog(3), services(5), syslog.conf(5), newsyslog(8)

     The BSD syslog Protocol, RFC, 3164, August 2001.

     The Syslog Protocol, RFC, 5424, March 2009.

HISTORY
     The syslogd command appeared in 4.3BSD.  Support for multiple log sockets appeared in
     NetBSD 1.4.  libwrap support appeared in NetBSD 1.6.

BSD					 October 15, 2009				      BSD


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