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

     syslogd -- log systems messages

     syslogd [-46dhnuV] [-a path] [-C CAfile] [-f config_file]
             [-m mark_interval] [-p log_socket] [-s reporting_socket]

     syslogd reads and logs messages to the system console, log files, pipes
     to other programs, other machines and/or users as specified by its con-
     figuration file.

     The options are as follows:

     -4      Forces syslogd to use only IPv4 addresses for UDP.

     -6      Forces syslogd to use only IPv6 addresses for UDP.

     -a path
             Specify a location where syslogd should place an additional log
             socket.  Up to 20 additional logging sockets can be specified.
             The primary use for this is to place additional log sockets in
             /dev/log of various chroot filespaces, though the need for these
             is less urgent after the introduction of sendsyslog(2).

     -C CAfile
             PEM encoded file containing CA certificates used for certificate
             validation; the default is /etc/ssl/cert.pem.

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

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

     -h      Include the hostname when forwarding messages to a remote host.

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

     -n      Print source addresses numerically rather than symbolically.
             This saves an address-to-name lookup for each incoming message,
             which can be useful when combined with the -u option on a loghost
             with no DNS cache.  Messages from the local host will still be
             logged with the symbolic local host name.

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

     -s reporting_socket
             Specify path to an AF_LOCAL socket for use in reporting logs
             stored in memory buffers using syslogc(8).

     -u      Select the historical ``insecure'' mode, in which syslogd will
             accept input from the UDP port.  Some software wants this, but
             you can be subjected to a variety of attacks over the network,
             including attackers remotely filling logs.

     -V      Do not perform server certificate and hostname validation.

     syslogd reads its configuration file when it starts up and whenever it
     receives a hangup signal.  For information on the format of the configu-
     ration file, see syslog.conf(5).

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

     syslogd opens an Internet domain socket as specified in /etc/services.
     Normally syslogd will only use this socket to send messages outwards, but
     in ``insecure'' mode it will also read messages from this socket.
     syslogd also opens and reads messages from the UNIX-domain socket
     /dev/log, and from the special device /dev/klog (to read kernel mes-

     syslogd opens the above described socket whether or not it is running in
     secure mode.  If syslogd is running in secure mode, all incoming data on
     this socket is discarded.  The socket is required for sending forwarded

     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>.

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

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

     The syslogd command appeared in 4.3BSD.

     syslogd does not create files, it only logs to existing ones.

BSD                             March 30, 2017                             BSD