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Full Discussion: Script to detect time drift
Operating Systems HP-UX Script to detect time drift Post 303017325 by rbatte1 on Monday 14th of May 2018 07:32:47 AM
Old 05-14-2018
You would have to do this on the client side. If you have a problem with your NTP time server, then treat that as the client and get it to align to another trusted clock, be that a radio-clock or internet address.

You can also use ntpdate -d refer-server to get a time difference from the reference server (which must be offering the NTP service, of course)

if the clock drift is too far, then you would need to step the clock on the local server to match something like this:-
  • Check the offset with - ntpdate -d ref-server
  • Stop the local NTP service in the normal way
  • Step the clock into sync - ntpdate ref-server
  • Start the local service in the normal way
  • Check the offset with - ntpdate -d ref-server

You should see debug information when you use the -d flag and the last line gives you the agreed offset from the reference server or servers (just a space separated list)


If you can't have the NTP client running all the time because your application doesn't like the clock going backwards even by tiny fractions of a second, you would probably need to schedule and idle minute to step the clock each day. You can run ntpdate -d ref-server at any time and just use the last line to show you the current offset from the trusted clock.



I hope that this helps,
Robin
 

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LEARN ABOUT DEBIAN

drift

drift(6x)							XScreenSaver manual							 drift(6x)

NAME

       drift - draws drifting recursive fractal cosmic flames

SYNOPSIS

       drift  [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-mono] [-install] [-visual visual] [-ncol-
       ors integer] [-delay microseconds] [-count integer] [-grow] [-no-grow] [-liss] [-no-liss]

       [-fps]

DESCRIPTION

       The drift program draws drifting recursive fractal cosmic flames

OPTIONS

       drift accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

       -install
	       Install a private colormap for the window.

       -visual visual
	       Specify which visual to use.  Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.

       -ncolors integer
	       How many colors should be used (if possible).  Default 200.  The colors used cycle through the hue, making N stops around the color
	       wheel.

       -count integer

       -grow

       -no-grow
	       Whether fractals should grow; otherwise, they are animated.

       -liss

       -no-liss
	       Whether we should use lissajous figures to get points.

       -fps    Display the current frame rate and CPU load.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
	       to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.

SEE ALSO

       flame(6x), X(1), xscreensaver(1), xlock(1)

COPYRIGHT

       Copyright (C) 1991, 1995 by Scott Draves.

       Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro-
       vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice  appear  in  sup-
       porting documentation.

AUTHOR

       Scott Draves <spot@cs.cmu.edu>, 06-Jun-91, 01-Jun-95.

       Ability to run standalone or with xscreensaver added by Jamie Zawinski <jwz@jwz.org>, 10-May-97.

X Version 11							5.15 (28-Sep-2011)							 drift(6x)
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