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Full Discussion: Comparing time differences between 2 Solaris servers
Top Forums UNIX for Beginners Questions & Answers Comparing time differences between 2 Solaris servers Post 303023490 by bakunin on Tuesday 18th of September 2018 06:20:53 AM
Old 09-18-2018
Quote:
Originally Posted by Fossil_84
Bakunin, I agree with you more that both servers should be sync to a single time server or setup in a way that it's sync to 2 or more servers. But assuming that there is a good reason that it's done this way (and also I would need lots of approval to reconfigure the servers).
Usually there is no good reason for doing something without a good reason. But that only as an aside. You should indeed investigate, because you likely end up implementing a solution for a non-existing problem. You might also want to tell us the surroundings of your problem:

I suppose you have the two servers in two different data centres and each of these data centres have its own stratum-3-server (is it that way?). This setup makes some sense because when a site disaster happens the other DC will stilll be able to operate on its own including NTP. In this case the question is if these stratum-3-servers aren't getting their time from a single stratum-2 server. If this is the case you need not check it because their time difference will be near zero or zero always. Timekeeping in systems is unreliable indeed but by far good enough so that any network latency which would update one stratum-3 server faster than the other is negligible.

Quote:
Originally Posted by Fossil_84
Would there be any commands/script that I can use to check the time difference between them?
There is the "UNIX time", which is a 32-bit integer value counting the seconds from Jan 1st 1970. You could get that via remote command execution (nowadays usually ssh, but for this the exact method doesn't matter) from the remote machine and the local machine and the it is simply a matter of integer arithmetic.

You will have to check if Solaris date can do the same as GNU date (or maybe GNU utilities are installed on your system - it wouldn't be uncommon) which is output times in RFC-3339 format. An example output would be (GNU date used):

Code:
# date --rfc-3339=ns

2018-09-18 12:12:59.142223794+02:00

Notice that there is a problem getting the time on both servers simultanously if you want to address differences lower than a second. You can never be sure how much of the difference is caused by network trasmission time and how much is because of differing clock times.

I hope this helps.

bakunin
 

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LEARN ABOUT REDHAT

ntptrace

ntptrace(1)							   User Commands						       ntptrace(1)

NAME

       ntptrace - Trace peers of an NTP server

SYNOPSIS

       ntptrace [-flags] [-flag [value]] [--option-name[[=| ]value]] [host]

DESCRIPTION

       ntptrace  is a perl script that uses the ntpq utility program to follow the chain of NTP servers from a given host back to the primary time
       source. For ntptrace to work properly, each of these servers must implement the NTP Control and Monitoring Protocol specified in  RFC  1305
       and enable NTP Mode 6 packets.

       If given no arguments, ntptrace 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

       -n, --numeric
	      Print IP addresses instead of hostnames.

	      Output hosts as dotted-quad numeric format rather than converting to the canonical host names.

       -m number, --max-hosts=number
	      Maximum number of peers to trace.  This option takes an integer number as its argument.  The default number for this option is:
		   99

	      This option has not been fully documented.

       -r string, --host=string
	      Single remote host.  The default string for this option is:
		   127.0.0.1

	      This option has not been fully documented.

       -?, --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.

NOTES

       This manual page was AutoGen-erated from the ntptrace option definitions.

ntp (4.2.8p13)							    20 Feb 2019 						       ntptrace(1)
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