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

NAME
     syslogd - log systems messages

SYNOPSIS
     syslogd [-dsuv] [-a allowed_peer] [-f config_file] [-m mark_interval]
             [-p log_socket] [-l path]

DESCRIPTION
     The syslogd daemon 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:

     -a allowed_peer
             Allow allowed_peer to log to this syslogd using UDP datagrams.
             Multiple -a options may be specified.

             Allowed_peer can be any of the following:

             ipaddr/masklen[:service]    Accept datagrams from ipaddr (in the
                                         usual dotted quad notation) with
                                         masklen bits being taken into account
                                         when doing the address comparision.
                                         If specified, service is the name or
                                         number of an UDP service (see
                                         services(5))the source packet must
                                         belong to.  A service of `*' allows
                                         packets being sent from any UDP port.
                                         The default service is `syslog'.  A
                                         missing masklen will be substituted
                                         by the historic class A or class B
                                         netmasks if ipaddr belongs into the
                                         address range of class A or B,
                                         respectively, or by 24 otherwise.

             domainname[:service]        Accept datagrams where the reverse
                                         address lookup yields domainname for
                                         the sender address.  The meaning of
                                         service is as explained above.

             *domainname[:service]       Same as before, except that any
                                         source host whose name ends in
                                         domainname will get permission.

     -d      Put syslogd into debugging mode.  This is probably only of use to
             developers working on syslogd.

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

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

     -p      Specify the pathname of an alternate log socket to be used
             instead; the default is /var/run/log.

     -l      Specify a location where syslogd should place an additional log
             socket.  Up to 19 additional logging sockets can be specified.
             The primary use for this is to place additional log sockets in
             /dev/log of various chroot filespaces.

     -s      Operate in secure mode.  Do not log messages from remote
             machines.  The messages will be received and counted and a log
             entry produced every time the count exceeds a power of two.

     -u      Unique priority logging.  Only log messages at the specified
             priority.  Without this option, messages at the stated priority
             or higher are logged.  This option changes the default 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.

     The syslogd daemon 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).

     The syslogd daemon 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).

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

     The message sent to 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, `<5.>' This priority code should map into
     the priorities defined in the include file <sys/syslog.h>.

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

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

HISTORY
     The syslogd command appeared in 4.3BSD.

     The -a, -s, -u, and -v options are FreeBSD 2.2 extensions.

BUGS
     The ability to log messages received in UDP packets is equivalent to an
     unauthenticated remote disk-filling service, and should probably be
     disabled by default.  Some sort of inter-syslogd authentication mechanism
     ought to be worked out.  To prevent the worst abuse, use of the -a option
     is therefore highly recommended.

     The -a matching algorithm doesn't pretend to be very efficient; use of
     numeric IP addresses is faster than domain name comparision.  Since the
     allowed peer list is being walked linearly, peer groups where frequent
     messages are being anticipated from should be put early into the -a list.

     The log socket was moved from /dev to ease the use of a read-only root
     filesystem. This may confuse some old binaries so that a symbolic link
     might be used for a transitional period.

BSD 4.2                        October 12, 1995                        BSD 4.2

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | BUGS

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