|SYSLOGD(8)||System Manager's Manual (smm)||SYSLOGD(8)|
syslogd — log
syslogd reads and logs messages to the
system console, log files, other machines and/or users as specified by its
- Restrict to IPv4 transport (default).
- Restrict to IPv6 transport.
- Allow transport with IPv4 and IPv6.
- 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.
- Bind listener to this address/name.
- Bind listener to this port.
- Specify the pathname of an alternate configuration file; the default is system specific and displayed in the help output.
- Specify the pathname of an alternate configuration directory; the default is system specific and displayed in the help output.
- Enable forwarding remote messages. By default syslogd will not forward messages it receives from remote hosts.
- A colon-seperated lists of hosts which should be considered local; they are logged by their hostnames instead by their FQDN.
- A colon-seperated list of domainnames which should be stripped from the FQDNs of hosts when logging.
- Select the number of minutes between "mark" messages; the default is 20 minutes. Setting it to 0 disables timestamps.
- Specify the pathname of an alternate log socket. The default is system specific and displayed in the help output.
- 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.
- Set local time on received messages.
- Force a file sync on every line.
- Suppress backgrounding and detachment of the daemon from its controlling terminal.
- 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.
- Do not listen to any unix domain socket. This option overrides -p and -a.
- Do not forward any messages. This overrides -h.
- Enter debug mode. syslogd does not put itself in the background, does not fork and shows debug information.
- Display help information and exit.
- Display a short usage message and exit.
- 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
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
/var/run/syslog.pid, and stores its process id
there. This can be used to kill or reconfigure
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
- The configuration file.
- The process id of current
- Name of the UNIX domain datagram log socket.
- /dev/klog, /proc/kmsg
- The kernel log device.
syslogd command appeared in
|February 9, 2019||GNU Network Utilities|