MirBSD manpage: ntpd(8)
NTPD(8) BSD System Manager's Manual NTPD(8)
ntpd - Network Time Protocol daemon
ntpd [-dSst] [-f file]
The ntpd daemon synchronizes the local clock to one or more remote NTP
servers, and can also act as an NTP server itself, redistributing the lo-
cal time. It implements the Simple Network Time Protocol version 4, as
described in RFC 2030, and the Network Time Protocol version 3, as
described in RFC 1305.
ntpd uses the adjtime(2) system call to correct the local system time
without causing time jumps. Adjustments are logged using syslog(3).
Leap seconds are accounted correctly on MirBSD using the libc
tai_leaps(3) facility. However, NTP will not survive the year 2038.
ntpd is usually started at boot time, and can be enabled by setting the
following in /etc/rc.conf.local:
ntpd_flags=""
See rc(8) and rc.conf(8) for more information on the boot process and
enabling daemons.
When ntpd starts up, it reads settings from a configuration file, typi-
cally ntpd.conf(5).
The options are as follows:
-d Do not daemonize. If this option is specified, ntpd will run
in the foreground and log to stderr.
-f file Use file as the configuration file, instead of the default
/etc/ntpd.conf.
-S Do not set the time immediately at startup. This is the de-
fault.
This option is deprecated.
-s Set the time immediately at startup if the local clock is off
by more than 180 seconds. Allows for a large time correction,
eliminating the need to run rdate(8) before starting ntpd.
This option is deprecated.
-t Trace information about the peer(s) used for adjusting. Use
several times for more information, unless running with -d.
/etc/ntpd.conf default ntpd configuration file
ntpd throws away all previously received replies from all peers and sends
out two queries quickly to re-sync when it receives SIGUSR1.
date(1), adjtime(2), ntpd.conf(5), rc(8), rc.conf(8), rdate(8),
taitime(3), timed(8)
Network Time Protocol (Version 3), RFC 1305, March 1992.
Simple Network Time Protocol (SNTP) Version 4, RFC 2030, October 1996.
The ntpd program first appeared in OpenBSD 3.6.
Support for correct leap second handling was added in MirBSD #8. Trace
and serverloop support was added in MirBSD #10. The -s and -S options
were removed and SIGUSR1 handling was added in MirBSD #11.
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