syslogd — log systems messages

syslogd  reads  and  logs  messages  to  the  system  console,  log files, other machines and/or users as
       specified by its configuration file.

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

       The syslogd command appeared in 4.3BSD.

GNU Network Utilities                           February 9, 2019                                      syslogd(8)

       syslogd — log systems messages

-4, --ipv4
               Restrict to IPv4 transport (default).

       -6, --ipv6
               Restrict to IPv6 transport.

       --ipany
               Allow transport with IPv4 and IPv6.

       -asocket
               Specify additional sockets from that syslogd has to listen to.  This is needed if you  are  going
               to  let  some  daemon  run  within a chroot()'ed environment. You can specify up to 19 additional
               sockets.

       -b, --bindaddr
               Bind listener to this address/name.

       -B, --bind-portport
               Bind listener to this port.

       -f, --rcfilefile
               Specify the pathname of an alternate configuration file;  the  default  is  system  specific  and
               displayed in the help output.

       -D, --rcdirdir
               Specify  the pathname of an alternate configuration directory; the default is system specific and
               displayed in the help output.

       -h, --hop
               Enable forwarding remote messages. By default syslogd will not forward messages it receives  from
               remote hosts.

       -lhost_list
               A  colon-seperated  lists  of  hosts  which  should be considered local; they are logged by their
               hostnames instead by their FQDN.

       -sdomain_list
               A colon-seperated list of domainnames which should be stripped  from  the  FQDNs  of  hosts  when
               logging.

       -m, --markinterval
               Select  the number of minutes between "mark" messages; the default is 20 minutes. Setting it to 0
               disables timestamps.

       -p, --socketpath
               Specify the pathname of an alternate log socket.  The default is system specific and displayed in
               the help output.

       -r, --inet
               Enable to receive remote messages using an internet domain socket.  The default is to not receive
               any messages from the network. Older version always accepted remote messages.

       -T, --local-time
               Set local time on received messages.

       -S, --sync
               Force a file sync on every line.

       -n, --no-detach
               Suppress backgrounding and detachment of the daemon from its controlling terminal.

       --no-klog
               Do not listen to the kernel log device. This is only supported on systems which define  a  kernel
               log device, on all others this is already the default, and the option will be silently ignored.

       --no-unixaf
               Do not listen to any unix domain socket. This option overrides -p and -a.

       --no-forward
               Do not forward any messages. This overrides -h.

       -d, --debug
               Enter  debug  mode.  syslogd does not put itself in the background, does not fork and shows debug
               information.

       -?, --help
               Display help information and exit.

       --usage
               Display a short usage message and exit.

       -V, --version
               Print version number and exit.

       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 /dev/log, from an Internet domain socket specified in
       /etc/services, and from the one of the special devices /dev/klog or /proc/kmsg depending  on  the  system
       (to  read kernel messages). In a GNU/Linux system it will not parse the System.map and use it to annotate
       the kernel messages.

       syslogd creates the file /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⟩.

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

syslogd [options...]