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32 .\" @(#)syslogd.8 8.1 (Berkeley) 6/6/93
33 .\" $FreeBSD: src/usr.sbin/syslogd/syslogd.8,v 1.22.2.16 2003/03/12 22:08:15 trhodes Exp $
40 .Nd log systems messages
44 .Op Fl a Ar allowed_peer
45 .Op Fl b Ar bind_address
46 .Op Fl f Ar config_file
48 .Op Fl m Ar mark_interval
50 .Op Fl p Ar log_socket
54 utility reads and logs messages to the system console, log files, other
55 machines and/or users as specified by its configuration file.
57 The options are as follows:
58 .Bl -tag -width indent
62 to use IPv4 addresses only.
66 to use IPv6 addresses only.
70 tries to send the message to only one address
71 even if the host has more than one A or AAAA record.
72 If this option is specified,
74 tries to send the message to all addresses.
75 .It Fl a Ar allowed_peer
80 using UDP datagrams. Multiple
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. A
112 allows packets being sent from any UDP port. The default
118 is IPv4 address, a missing
120 will be substituted by the historic class A or class B netmasks if
122 belongs into the address range of class A or B, respectively, or
125 is IPv6 address, a missing
127 will be substituted by 128.
130 .Ar domainname Op : Ar service
133 Accept datagrams where the reverse address lookup yields
135 for the sender address. The meaning of
137 is as explained above.
140 .No * Ar domainname Op : Ar service
143 Same as before, except that any source host whose name
152 options are ignored if the
154 option is also specified.
155 .It Fl b Ar bind_address
156 Specify one specific IP address or hostname to bind to.
157 If a hostname is specified,
158 the IPv4 or IPv6 address which corresponds to it is used.
160 Disable the compression of repeated instances of the same line
161 into a single line of the form
162 .Dq Li "last message repeated N times"
163 when the output is a pipe to another program.
164 If specified twice, disable this compression in all cases.
168 into debugging mode. This is probably only of use to developers working on
171 Specify the pathname of an alternate configuration file;
173 .Pa /etc/syslog.conf .
175 Disable the translation of
176 messages received with facility
182 facility is reserved for messages read directly from
185 Select the number of minutes between
187 messages; the default is 20 minutes.
189 Disable dns query for every request.
191 Specify the pathname of an alternate log socket to be used instead;
195 Specify an alternative file in which to store the process ID.
197 .Pa /var/run/syslog.pid .
199 Specify a location where
201 should place an additional log socket.
202 Up to 19 additional logging sockets can be specified.
203 The primary use for this is to place additional log sockets in
205 of various chroot filespaces.
207 Operate in secure mode. Do not log messages from remote machines. If
208 specified twice, no network socket will be opened at all, which also
209 disables logging to remote machines.
211 Unique priority logging. Only log messages at the specified priority.
212 Without this option, messages at the stated priority or higher are logged.
213 This option changes the default comparison from
218 Verbose logging. If specified once, the numeric facility and priority are
219 logged with each locally-written message. If specified more than once,
220 the names of the facility and priority are logged with each locally-written
226 utility reads its configuration file when it starts up and whenever it
227 receives a hangup signal.
228 For information on the format of the configuration file,
234 utility reads messages from the
238 from an Internet domain socket specified in
240 and from the special device
242 (to read kernel messages).
246 utility creates its process ID file,
248 .Pa /var/run/syslog.pid ,
249 and stores its process
251 This can be used to kill or reconfigure
256 should consist of a single line.
257 The message can contain a priority code, which should be a preceding
258 decimal number in angle braces, for example,
260 This priority code should map into the priorities defined in the
262 .Aq Pa sys/syslog.h .
264 For security reasons,
266 will not append to log files that do not exist;
267 therefore, they must be created manually before running
270 .Bl -tag -width /var/run/syslog.pid -compact
271 .It Pa /etc/syslog.conf
273 .It Pa /var/run/syslog.pid
274 default process ID file
278 domain datagram log socket
303 The ability to log messages received in UDP packets is equivalent to
304 an unauthenticated remote disk-filling service, and should probably be
305 disabled by default. Some sort of
306 .No inter- Ns Nm syslogd
307 authentication mechanism ought to be worked out. To prevent the worst
310 option is therefore highly recommended.
314 matching algorithm doesn't pretend to be very efficient; use of numeric
315 IP addresses is faster than domain name comparison. Since the allowed
316 peer list is being walked linearly, peer groups where frequent messages
317 are being anticipated from should be put early into the
321 The log socket was moved from
323 to ease the use of a read-only root file system.
325 some old binaries so that a symbolic link might be used for a