Time synch monitoring Post: 302988254

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Top Forums Shell Programming and Scripting Time synch monitoring Post 302988254 by jim mcnamara on Thursday 22nd of December 2016 12:20:50 PM

12-22-2016

Registered User

Filename drift - don't know Debian but it should be in the same directory tree as some other ntp files. It can be named drift or ntp.drift. Some systems have it in /etc/[something] other have it in /var/lib/ntp It gives you an estimate of your computer's clock accuracy - what it is try to correct. The values are ppm. Not seconds.
So, in an 86400 second day 10ppm is 864ms per day correction required. What this means is that ntp has had to add or subtract (if negative) that amount averaged over days of uptime. If you reset file the drift file every day

Code:

echo " `date`  `cat /etc/ntp/ntp.drift`" > /someplace/somelogfile
> /etc/ntp/ntp.drift

you get an approximation of the corrections going on for that day.

If you check the file periodically and find major changes (you decide the definition of major) you can report a problem.

Now. Locality of the time server, network, local cpu, and the stratum of your time server all affect accuracy. You should have a single server in your network that connects to a known lower stratum time server. If your time server is in house and NOT going outside, good luck with correct time. If this is for legal purposes, like records you keep and report to external agencies, correct time has to be in order.

If this is scientific or research timing between systems, especially logging boxes, is very important. Correct time as defined by an external arbiter is not usually a big deal.

What do you need? Going for a really tiny discrepancy in the drift file is not usually required.

Last edited by jim mcnamara; 12-22-2016 at 01:27 PM..

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ntptrace

NTPTRACE(1)                                                   General Commands Manual                                                  NTPTRACE(1)

NAME

       ntptrace - trace a chain of NTP servers back to the primary source

SYNOPSIS

       ntptrace [ -m max_hops ] [ -n ]

DESCRIPTION

       ntptrace determines where a given Network Time Protocol (NTP) server gets its time from, and follows the chain of NTP servers back to their
       master time source. If given no arguments, it starts with localhost. Here is an example of the output from ntptrace:

       % ntptrace
       localhost: stratum 4, offset 0.0019529, synch distance 0.144135
       server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
       usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'

       On each line, the fields are (left to right): the host name, the host stratum, the time offset between that host and  the  local  host  (as
       measured  by  ntptrace;  this  is  why  it  is not always zero for "localhost"), the host synchronization distance, and (only for stratum-1
       servers) the reference clock ID. All times are given in seconds. Note that the stratum is the server hop count to the primary source, while
       the synchronization distance is the estimated error relative to the primary source. These terms are precisely defined in RFC-1305.

OPTIONS

       -m max_hops
              Sets the number of server hops to follow (default = 99).

       -n     Turns off the printing of host names; instead, host IP addresses are given. This may be useful if a nameserver is down.

BUGS

       This program makes no attempt to improve accuracy by doing multiple samples.

Network Time Protocol                                            December 4, 2011                                                      NTPTRACE(1)