02-27-2017
NTPD service restart and time synch
I am using ntpd service to sync our RHEL 5.9 system to synch with GPS clock.
When I change the RHEL system time more than 7 seconds than the present system time (through "Datetime" command), ntpd service does not adjust the system time to the present GPS time.But if the time is with in 7 seconds, the system time is correctly adjusted after we change the system time manually by "datetime" command.
7 second is specified in our drift file. Once I restarts the ntpd service manually, the time is again adjusted with the present GPS time. I have read many article in google and my understanding from the articles are as follows.
The ntpd service adjusts the drift (drift is specified in drift file).It assumes that systeem clock should be always synched with the GPS clock (reliable time source) unless and until ntpd
malfunctions. Can any one tell how ntpd works in comparison with W32tm service in window system?
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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)