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28 .\" @(#)syslogd.8 8.1 (Berkeley) 6/6/93
36 .Nd log systems messages
40 .Op Fl a Ar allowed_peer
41 .Op Fl b Ar bind_address
42 .Op Fl f Ar config_file
43 .Op Fl l Oo Ar mode : Oc Ns Ar path
44 .Op Fl m Ar mark_interval
46 .Op Fl p Ar log_socket
50 utility reads and logs messages to the system console, log files, other
51 machines and/or users as specified by its configuration file.
53 The options are as follows:
54 .Bl -tag -width indent
58 to use IPv4 addresses only.
62 to use IPv6 addresses only.
66 not to interfere with 8-bit data. Normally
68 will replace C1 control characters
69 .Pq ISO 8859 and Unicode characters
73 Note, this option does not change the way
75 alters control characters
76 .Pq see Xr iscntrl 3 .
77 They will always be replaced with their
83 tries to send the message to only one address
84 even if the host has more than one A or AAAA record.
85 If this option is specified,
87 tries to send the message to all addresses.
88 .It Fl a Ar allowed_peer
96 options may be specified.
99 can be any of the following:
100 .Bl -tag -width "ipaddr/masklen[:service]XX"
108 Accept datagrams from
110 (in the usual dotted quad notation) with
112 bits being taken into account when doing the address comparison.
114 can be also IPv6 address by enclosing the address with
120 is the name or number of an UDP service (see
122 the source packet must belong to.
127 allows packets being sent from any UDP port.
134 is IPv4 address, a missing
136 will be substituted by the historic class A or class B netmasks if
138 belongs into the address range of class A or B, respectively, or
142 is IPv6 address, a missing
144 will be substituted by 128.
147 .Ar domainname Op : Ar service
150 Accept datagrams where the reverse address lookup yields
152 for the sender address.
155 is as explained above.
158 .No * Ar domainname Op : Ar service
161 Same as before, except that any source host whose name
170 options are ignored if the
172 option is also specified.
173 .It Fl b Ar bind_address
174 Specify one specific IP address or hostname to bind to.
175 If a hostname is specified,
176 the IPv4 or IPv6 address which corresponds to it is used.
178 Disable the compression of repeated instances of the same line
179 into a single line of the form
180 .Dq Li "last message repeated N times"
181 when the output is a pipe to another program.
182 If specified twice, disable this compression in all cases.
187 This is probably only of use to developers working on
190 Specify the pathname of an alternate configuration file;
192 .Pa /etc/syslog.conf .
194 Disable the translation of
195 messages received with facility
201 facility is reserved for messages read directly from
204 Select the number of minutes between
206 messages; the default is 20 minutes.
208 Disable dns query for every request.
210 Prefix kernel messages with the full kernel boot file as determined by
212 Without this, the kernel message prefix is always
215 Specify the pathname of an alternate log socket to be used instead;
219 Specify an alternative file in which to store the process ID.
221 .Pa /var/run/syslog.pid .
223 Specify the pathname of an alternate log socket for privileged
224 applications to be used instead; the default is
225 .Pa /var/run/logpriv .
227 Specify a location where
229 should place an additional log socket.
230 The primary use for this is to place additional log sockets in
232 of various chroot filespaces.
233 File permissions for socket can be specified in octal representation
234 before socket name, delimited with a colon.
235 Path to socket location must be absolute.
237 Operate in secure mode.
238 Do not log messages from remote machines.
240 specified twice, no network socket will be opened at all, which also
241 disables logging to remote machines.
243 Unique priority logging.
244 Only log messages at the specified priority.
245 Without this option, messages at the stated priority or higher are logged.
246 This option changes the default comparison from
252 If specified once, the numeric facility and priority are
253 logged with each locally-written message.
254 If specified more than once,
255 the names of the facility and priority are logged with each locally-written
261 utility reads its configuration file when it starts up and whenever it
262 receives a hangup signal.
263 For information on the format of the configuration file,
269 utility reads messages from the
274 .Pa /var/run/logpriv ,
275 from an Internet domain socket specified in
277 and from the special device
279 (to read kernel messages).
283 utility creates its process ID file,
285 .Pa /var/run/syslog.pid ,
286 and stores its process
288 This can be used to kill or reconfigure
293 should consist of a single line.
294 The message can contain a priority code, which should be a preceding
295 decimal number in angle braces, for example,
297 This priority code should map into the priorities defined in the
301 For security reasons,
303 will not append to log files that do not exist;
304 therefore, they must be created manually before running
307 .Bl -tag -width /var/run/syslog.pid -compact
308 .It Pa /etc/syslog.conf
310 .It Pa /var/run/syslog.pid
311 default process ID file
315 domain datagram log socket
316 .It Pa /var/run/logpriv
318 socket for privileged applications
344 The ability to log messages received in UDP packets is equivalent to
345 an unauthenticated remote disk-filling service, and should probably be
348 .No inter- Ns Nm syslogd
349 authentication mechanism ought to be worked out.
353 option is therefore highly recommended.
357 matching algorithm does not pretend to be very efficient; use of numeric
358 IP addresses is faster than domain name comparison.
360 peer list is being walked linearly, peer groups where frequent messages
361 are being anticipated from should be put early into the
365 The log socket was moved from
367 to ease the use of a read-only root file system.
369 some old binaries so that a symbolic link might be used for a