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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
47 .Op Fl m Ar mark_interval
49 .Op Fl p Ar log_socket
53 utility reads and logs messages to the system console, log files, other
54 machines and/or users as specified by its configuration file.
56 The options are as follows:
57 .Bl -tag -width indent
61 to use IPv4 addresses only.
65 to use IPv6 addresses only.
69 tries to send the message to only one address
70 even if the host has more than one A or AAAA record.
71 If this option is specified,
73 tries to send the message to all addresses.
74 .It Fl a Ar allowed_peer
82 options may be specified.
85 can be any of the following:
86 .Bl -tag -width "ipaddr/masklen[:service]XX"
96 (in the usual dotted quad notation) with
98 bits being taken into account when doing the address comparison.
100 can be also IPv6 address by enclosing the address with
106 is the name or number of an UDP service (see
108 the source packet must belong to.
113 allows packets being sent from any UDP port.
120 is IPv4 address, a missing
122 will be substituted by the historic class A or class B netmasks if
124 belongs into the address range of class A or B, respectively, or
128 is IPv6 address, a missing
130 will be substituted by 128.
133 .Ar domainname Op : Ar service
136 Accept datagrams where the reverse address lookup yields
138 for the sender address.
141 is as explained above.
144 .No * Ar domainname Op : Ar service
147 Same as before, except that any source host whose name
156 options are ignored if the
158 option is also specified.
159 .It Fl b Ar bind_address
160 Specify one specific IP address or hostname to bind to.
161 If a hostname is specified,
162 the IPv4 or IPv6 address which corresponds to it is used.
164 Disable the compression of repeated instances of the same line
165 into a single line of the form
166 .Dq Li "last message repeated N times"
167 when the output is a pipe to another program.
168 If specified twice, disable this compression in all cases.
173 This is probably only of use to developers working on
176 Specify the pathname of an alternate configuration file;
178 .Pa /etc/syslog.conf .
180 Disable the translation of
181 messages received with facility
187 facility is reserved for messages read directly from
190 Select the number of minutes between
192 messages; the default is 20 minutes.
194 Disable dns query for every request.
196 Prefix kernel messages with the full kernel boot file as determined by
198 Without this, the kernel message prefix is always
201 Specify the pathname of an alternate log socket to be used instead;
205 Specify an alternative file in which to store the process ID.
207 .Pa /var/run/syslog.pid .
209 Specify a location where
211 should place an additional log socket.
212 The primary use for this is to place additional log sockets in
214 of various chroot filespaces.
215 File permissions for socket can be specified in octal representation
216 before socket name, delimited with a colon.
217 Path to socket location must be absolute.
219 Operate in secure mode.
220 Do not log messages from remote machines.
222 specified twice, no network socket will be opened at all, which also
223 disables logging to remote machines.
225 Unique priority logging.
226 Only log messages at the specified priority.
227 Without this option, messages at the stated priority or higher are logged.
228 This option changes the default comparison from
234 If specified once, the numeric facility and priority are
235 logged with each locally-written message.
236 If specified more than once,
237 the names of the facility and priority are logged with each locally-written
243 utility reads its configuration file when it starts up and whenever it
244 receives a hangup signal.
245 For information on the format of the configuration file,
251 utility reads messages from the
256 .Pa /var/run/logpriv ,
257 from an Internet domain socket specified in
259 and from the special device
261 (to read kernel messages).
265 utility creates its process ID file,
267 .Pa /var/run/syslog.pid ,
268 and stores its process
270 This can be used to kill or reconfigure
275 should consist of a single line.
276 The message can contain a priority code, which should be a preceding
277 decimal number in angle braces, for example,
279 This priority code should map into the priorities defined in the
283 For security reasons,
285 will not append to log files that do not exist;
286 therefore, they must be created manually before running
289 .Bl -tag -width /var/run/syslog.pid -compact
290 .It Pa /etc/syslog.conf
292 .It Pa /var/run/syslog.pid
293 default process ID file
297 domain datagram log socket
298 .It Pa /var/run/logpriv
300 socket for privileged applications
326 The ability to log messages received in UDP packets is equivalent to
327 an unauthenticated remote disk-filling service, and should probably be
330 .No inter- Ns Nm syslogd
331 authentication mechanism ought to be worked out.
335 option is therefore highly recommended.
339 matching algorithm doesn't pretend to be very efficient; use of numeric
340 IP addresses is faster than domain name comparison.
342 peer list is being walked linearly, peer groups where frequent messages
343 are being anticipated from should be put early into the
347 The log socket was moved from
349 to ease the use of a read-only root file system.
351 some old binaries so that a symbolic link might be used for a