02-23-2011
rdate is real old and obsolete program. Few servers still run the daytime service needed to accommodate it. ntp comes with ntpdate which is a better program.
When you first turn a computer on, you need some way to set the time close to being correct. Then ntpd will correct it the rest of the way. One way is for the computer to have a battery operated clock that runs while the system is off. Most computers have this and it usually is managed automatically by the OS. In Linux we have hwclock to do it and by making it command we have explicit control over the process. In general it's better than nothing and it's worth doing... as a first step.
But then I would try an ntpdate command. The ntp server must be running for this to work. But if it is ntpdate will give a more accurate initial setting. This should be done in the ntp start up script before starting ntpd.
Since everyone runs ntpdate followed by ntpd it makes since to build an option into ntpd to effective do what ntpdate does as it starts. I notice the docs for the latest ntpd suggests that we retire ntpdate. But I still run it anyway...old habits die hard.
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LEARN ABOUT PLAN9
ntp-wait
ntp-wait(1) User Commands ntp-wait(1)
NAME
ntp-wait - Wait for ntpd to stabilize the system clock
SYNOPSIS
ntp-wait [-flags] [-flag [value]] [--option-name[[=| ]value]]
All arguments must be options.
DESCRIPTION
ntp-wait will send at most num-tries queries to ntpd(8), sleeping for secs-between-tries after each status return that says ntpd(8) has not
yet produced a synchronized and stable system clock.
ntp-wait will do this quietly, unless the -v flag is provided. This can be useful at boot time, to delay the boot sequence until after
ntpd -g has set the time.
OPTIONS
-n number, --tries=number
Number of times to check ntpd. This option takes an integer number as its argument. The default number for this option is:
100
The maximum number of times we will check ntpd to see if
it has been able to synchronize and stabilize the system clock.
-s secs-between-tries, --sleep=secs-between-tries
How long to sleep between tries. This option takes an integer number as its argument. The default secs-between-tries for this
option is:
6
We will sleep for secs-between-tries after each query
of ntpd that returns "the time is not yet stable".
-v, --verbose
Be verbose.
By default, ntp-wait is silent.
With this option, ntp-wait will provide status information.
-?, --help
Display usage information and exit.
-!, --more-help
Pass the extended usage information through a pager.
-v [{v|c|n --version [{v|c|n}]}]
Output version of program and exit. The default mode is `v', a simple version. The `c' mode will print copyright information and
`n' will print the full copyright notice.
EXIT STATUS
One of the following exit values will be returned:
0 (EXIT_SUCCESS)
Successful program execution.
1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
70 (EX_SOFTWARE)
libopts had an internal operational error. Please report it to autogen-users@lists.sourceforge.net. Thank you.
AUTHORS
Harlan Stenn
NOTES
This document corresponds to version 4.2.8p13 of NTP.
This manual page was AutoGen-erated from the ntp-wait option definitions.
ntp (4.2.8p13) 20 Feb 2019 ntp-wait(1)