Lines Matching +full:startup +full:- +full:time +full:- +full:ms
4 .\" EDIT THIS FILE WITH CAUTION (ntpd-opts.mdoc)
6 .\" It has been AutoGen-ed May 25, 2024 at 12:03:54 AM by AutoGen 5.18.16
7 .\" From the definitions ntpd-opts.def
8 .\" and the template file agmdoc-cmd.tpl
17 .Op Fl \-option\-name Ns Oo Oo Ns "=| " Oc Ns Ar value Oc
24 and maintains the system time of day in synchronism with Internet
25 standard time servers.
27 Network Time Protocol (NTP) version 4, as defined by RFC\-5905,
29 version 3, as defined by RFC\-1305, and versions 1
30 and 2, as defined by RFC\-1059 and RFC\-1119, respectively.
34 utility does most computations in 64\-bit floating point
35 arithmetic and does relatively clumsy 64\-bit fixed point operations
46 configuration file at startup time in order to determine the
54 listening to broadcasts at run time.
90 .Bl -tag
91 .It Fl 4 , Fl \-ipv4
98 .It Fl 6 , Fl \-ipv6
105 .It Fl a , Fl \-authreq
113 .It Fl A , Fl \-authnoreq
121 .It Fl b , Fl \-bcastsync
124 .It Fl c Ar string , Fl \-configfile Ns = Ns Ar string
130 .It Fl d , Fl \-debug\-level
134 .It Fl D Ar number , Fl \-set\-debug\-level Ns = Ns Ar number
139 .It Fl f Ar string , Fl \-driftfile Ns = Ns Ar string
150 .It Fl g , Fl \-panicgate
156 exits with a message to the system log if the offset exceeds the panic threshold, which is 1000 s by default. This option allows the time to be set to any value without restriction; however, this can happen only once. If the threshold is exceeded after that,
159 \fB\-q\fP
161 \fB\-x\fP
166 .It Fl G , Fl \-force\-step\-once
171 steps the time if the time offset exceeds the step threshold,
172 which is 128 ms by default, and otherwise slews the time.
174 so the highest time accuracy can be achieved quickly.
175 However, this may also cause the time to be stepped back
177 applications requiring monotonic time are running.
179 .It Fl i Ar string , Fl \-jaildir Ns = Ns Ar string
185 This option also implies that the server attempts to drop root privileges at startup.
187 \fB\-u\fP
192 \fB\-\-enable\-clockctl\fP) or Linux (configure with
193 \fB\-\-enable\-linuxcaps\fP) or Solaris (configure with \fB\-\-enable\-solarisprivs\fP).
194 .It Fl I Ar iface , Fl \-interface Ns = Ns Ar iface
203 .It Fl k Ar string , Fl \-keyfile Ns = Ns Ar string
212 .It Fl l Ar string , Fl \-logfile Ns = Ns Ar string
220 .It Fl L , Fl \-novirtualips
227 .It Fl M , Fl \-modifymmtimer
233 .It Fl n , Fl \-nofork
236 wait\-sync.
238 .It Fl N , Fl \-nice
244 .It Fl p Ar string , Fl \-pidfile Ns = Ns Ar string
253 .It Fl P Ar number , Fl \-priority Ns = Ns Ar number
262 .It Fl q , Fl \-quit
263 Set the time and quit.
265 saveconfigquit, wait\-sync.
273 \fB\-g\fP
275 \fB\-x\fP
277 Note: The kernel time discipline is disabled with this option.
278 .It Fl r Ar string , Fl \-propagationdelay Ns = Ns Ar string
282 .It Fl \-saveconfigquit Ns = Ns Ar string
285 quit, wait\-sync.
287 Cause \fBntpd\fP to parse its startup configuration file and save an
290 .It Fl s Ar string , Fl \-statsdir Ns = Ns Ar string
297 .It Fl t Ar tkey , Fl \-trustedkey Ns = Ns Ar tkey
302 .It Fl u Ar string , Fl \-user Ns = Ns Ar string
309 \fB\-\-enable\-clockctl\fP) or Linux (configure with
310 \fB\-\-enable\-linuxcaps\fP) or Solaris (configure with \fB\-\-enable\-solarisprivs\fP).
311 .It Fl U Ar number , Fl \-updateinterval Ns = Ns Ar number
315 Give the time in seconds between two scans for new or dropped interfaces.
318 Use 0 to disable scanning. 60 seconds is the minimum time between scans.
319 .It Fl \-var Ns = Ns Ar nvar
323 .It Fl \-dvar Ns = Ns Ar ndvar
327 .It Fl w Ar number , Fl \-wait\-sync Ns = Ns Ar number
341 .It Fl x , Fl \-slew
344 Normally, the time is slewed if the offset is less than the step threshold, which is 128 ms by default, and stepped if above the threshold.
346 Note: Since the slew rate of typical Unix kernels is limited to 0.5 ms/s, each second of adjustment requires an amortization interval of 2000 s.
349 \fB\-g\fP
351 \fB\-q\fP
356 Note: The kernel time discipline is disabled with this option.
357 .It Fl \-usepcc
364 .It Fl \-pccfreq Ns = Ns Ar string
370 .It Fl m , Fl \-mdns
375 .It Fl \&? , Fl \-help
377 .It Fl \&! , Fl \-more\-help
379 .It Fl \-version Op Brq Ar v|c|n
388 \fBNTPD_<option\-name>\fP or \fBNTPD\fP
418 time\-of\-year (TOY) chip to maintain the time during periods when
421 initialize the operating system time.
424 chip from time to time.
427 detects that the time on the host
428 is more than 1000s from the server time,
442 clock will be set to the server time regardless of the chip time
458 the synchronization distance, which is equal to one\-half the
462 algorithms discard sample offsets exceeding 128 ms,
464 ms exceeds 900s.
466 offset, steps the clock to the indicated time.
472 very rarely strays more than 128 ms even under extreme cases of
478 the error might grow to exceed 128 ms,
480 if the local clock time is more than 128 s
494 to 500 parts\-per\-million (PPM) as a consequence of the correctness
497 As a result, the local clock can take a long time to
503 correctly synchronized network time.
506 frequency errors are present the resulting time offsets stray
507 outside the 128\-ms range and an eventual step or slew time
521 .Cm time.ien.it
533 in the past many startup scripts would run
542 and you still need to set the system time before starting
564 will effectively "warm\-start" and your system's clock will
565 be stable in under 11 seconds' time.
567 As soon as possible in the startup sequence, start
578 as much time as possible to get the system's clock synchronized and stable.
585 monotonically\-increasing time,
587 .Xr ntp\-wait 1ntp\-waitmdoc
593 .Xr ntp\-wait 1ntp\-waitmdoc
596 stable time.
600 behavior at startup depends on whether the
611 the particular system clock oscillator time and frequency error.
612 This takes approximately 15 minutes, after which the time and
616 normal mode, where the time and frequency are continuously tracked
642 However, it can operate in a one\-time
643 mode where the time is set from an external server and frequency is
647 compute server\-client propagation delay correction factors and
667 unreachable for some time, the poll interval is increased in steps
690 setting the clock for the first time.
724 stopped and run in one\-time mode as required.
725 At each startup, the
775 .Ss "The huff\-n'\-puff Filter"
782 many cases the apparent time errors are so large as to exceed the
786 The huff\-n'\-puff filter is designed to correct the apparent time
812 .Bl -tag -width /etc/ntp.drift -compact
822 .Bl -tag
829 it to autogen\-users@lists.sourceforge.net. Thank you.
846 .%T Network Time Protocol (Version 1)
851 .%T Network Time Protocol (Version 2)
856 .%T Network Time Protocol (Version 3)
864 .%T Network Time Protocol Version 4: Protocol and Algorithms Specification
870 .%T Network Time Protocol Version 4: Autokey Specification
877 .%T Definitions of Managed Objects for Network Time Protocol Version 4: (NTPv4)
883 .%T Network Time Protocol (NTP) Server Option for DHCPv6
887 The University of Delaware and Network Time Foundation
889 Copyright (C) 1992\-2024 The University of Delaware and Network Time Foundation all rights reserved.
896 larger than might be desirable for an elevated\-priority
907 This manual page was \fIAutoGen\fP\-erated from the \fBntpd\fP