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.
-4
,
--ipv4
- Restrict to IPv4 transport (default).
-6
,
--ipv6
- Restrict to IPv6 transport.
--ipany
- Allow transport with IPv4 and IPv6.
-a
socket
- 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
,
--bind
addr
- Bind listener to this address/name.
-B
,
--bind-port
port
- Bind listener to this port.
-f
,
--rcfile
file
- Specify the pathname of an alternate configuration file; the default is
system specific and displayed in the help output.
-D
,
--rcdir
dir
- 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.
-l
host_list
- A colon-seperated lists of hosts which should be considered local; they
are logged by their hostnames instead by their FQDN.
-s
domain_list
- A colon-seperated list of domainnames which should be stripped from the
FQDNs of hosts when logging.
-m
,
--mark
interval
- Select the number of minutes between "mark" messages; the
default is 20 minutes. Setting it to 0 disables timestamps.
-p
,
--socket
path
- 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
/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⟩.
- /etc/syslog.conf
- The configuration file.
- /var/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.