Re: [ntp:questions] NTP time compare util
Kennedy, Paul wrote: http://secondthoughts.no-ip.org/page-peerstats.php I thought i saw some similar utilities on satsignal.eu/ntp by David Taylor. -- E-Mail Sent to this address blackl...@anitech-systems.com will be added to the BlackLists. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
Steve Kostecke wrote: On 2012-08-28, David Woolley david@ex.djwhome.demon.invalid wrote: Steve Kostecke wrote: ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. Unless it has changed recently, it steers towards an average of all the servers that haven't been eliminated. The best one is only used to set the stratum and the downstream error statistics (root distance, and root dispersion). At one time the averaging was weighted. I'm not completely sure if even that is true, now. *plonk* That's a weird response to a low volume poster who has never been challenged when they have made this point before. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
I had a think about this oddball question last night, and decided to explore it a little further. Assuming I understand the original question from Harry Bloomfield, it came to me that the we already have the data Harry is looking for in the peerstats files, ie we have a data record for each response from each configured server... 1.pool.ntp.org Time, offset, jitter, delay Time, offset, jitter, delay Time, offset, jitter, delay an.other.server Time, offset, jitter, delay Time, offset, jitter, delay Time, offset, jitter, delay Harry was looking for a display of this, so I spent a couple of hours and made something which displays the live data... http://secondthoughts.no-ip.org/page-peerstats.php You will see from the plots, I am still fooling round with the conf file, but general principle is to make a utility which can display a 24hour data 'time quality' from several servers at once (Harry asked for the 'time' from several servers, but I interpret that to mean the quality of the time from those servers, as all the humans I know cannot deal with milliseconds) Maybe Harry is really after super-humans (ie the borg), so they are all in collective sync, but this is as good as I can do right now. regards ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
telsar no...@nowhere.com writes: On 8/24/2012 7:52 AM, Harry Bloomfield wrote: [Cross-posting to news:comp.protocols.time.ntp, for obvious reasons.] Out of nothing more that idle curiosity, I am looking a utility which can display the time from several internet time servers at once. I also need to be able to set which time servers it interrogates. Anyone come across such a utility please? ntpdate comes to mind, but it could just be a Unix phenomena. If you search on Network Time Protocol (NTP) you will see much. ntpdate is a suite of client/server programs to do all this stuff. [...] The ntpdate [1] version I use seems to come from the ntp.org package [2], apparently developed by the developers of the NTP protocol itself. Ordinarily, ntpdate(8) is used to set the system's clock to the time obtained by (AIUI) averaging (with weights) the times reported by the servers specified. However, when started as follows, it can show the difference without setting time: $ /usr/sbin/ntpdate -uvq 0.debian.pool.ntp.org 1.debian.pool.ntp.org ... And if the debugging mode is also set (with -d), it shows the individual times reported, too. [1] http://en.wikipedia.org/wiki/Ntpdate [2] http://ntp.org/downloads.html -- FSF associate member #7257 http://sf-day.org/ ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
Ivan, That tool would be ntpd. Just add all the servers you want to monitor, restart ntp and then run ntpq -p to see them all lined up. You can log the data to peerstats files to a file and make long term plots. Regards - Original Message - From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org questions-bounces+p.kennedy=fugro.com...@lists.ntp.org To: questions@lists.ntp.org questions@lists.ntp.org Sent: Tue Aug 28 18:45:00 2012 Subject: Re: [ntp:questions] NTP time compare util telsar no...@nowhere.com writes: On 8/24/2012 7:52 AM, Harry Bloomfield wrote: [Cross-posting to news:comp.protocols.time.ntp, for obvious reasons.] Out of nothing more that idle curiosity, I am looking a utility which can display the time from several internet time servers at once. I also need to be able to set which time servers it interrogates. Anyone come across such a utility please? ntpdate comes to mind, but it could just be a Unix phenomena. If you search on Network Time Protocol (NTP) you will see much. ntpdate is a suite of client/server programs to do all this stuff. [...] The ntpdate [1] version I use seems to come from the ntp.org package [2], apparently developed by the developers of the NTP protocol itself. Ordinarily, ntpdate(8) is used to set the system's clock to the time obtained by (AIUI) averaging (with weights) the times reported by the servers specified. However, when started as follows, it can show the difference without setting time: $ /usr/sbin/ntpdate -uvq 0.debian.pool.ntp.org 1.debian.pool.ntp.org ... And if the debugging mode is also set (with -d), it shows the individual times reported, too. [1] http://en.wikipedia.org/wiki/Ntpdate [2] http://ntp.org/downloads.html -- FSF associate member #7257 http://sf-day.org/ ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
On 2012-08-28, Ivan Shmakov oneing...@gmail.com wrote: telsar no...@nowhere.com writes: On 8/24/2012 7:52 AM, Harry Bloomfield wrote: [Cross-posting to news:comp.protocols.time.ntp, for obvious reasons.] Out of nothing more that idle curiosity, I am looking a utility which can display the time from several internet time servers at once. I also need to be able to set which time servers it interrogates. Anyone come across such a utility please? Use ntpd + ntpq. ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. ntpq can be used to display the differences between the time servers polled by ntpd. -- Steve Kostecke koste...@ntp.org NTP Public Services Project - http://support.ntp.org/ ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
I am looking a utility which can display the time from several internet time servers at once. I also need to be able to set which time servers it interrogates. As others have said, NTP itself is the best at doing this. I can't think of anything else that could work reasonably well. Chris Albertson Redondo Beach, California ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
Steve Kostecke wrote: ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. Unless it has changed recently, it steers towards an average of all the servers that haven't been eliminated. The best one is only used to set the stratum and the downstream error statistics (root distance, and root dispersion). At one time the averaging was weighted. I'm not completely sure if even that is true, now. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
On 2012-08-28, David Woolley david@ex.djwhome.demon.invalid wrote: Steve Kostecke wrote: ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. Unless it has changed recently, it steers towards an average of all the servers that haven't been eliminated. The best one is only used to set the stratum and the downstream error statistics (root distance, and root dispersion). At one time the averaging was weighted. I'm not completely sure if even that is true, now. *plonk* -- Steve Kostecke koste...@ntp.org NTP Public Services Project - http://support.ntp.org/ ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
Steve Kostecke koste...@ntp.org writes: On 2012-08-28, Ivan Shmakov oneing...@gmail.com wrote: telsar no...@nowhere.com writes: On 8/24/2012 7:52 AM, Harry Bloomfield wrote: [...] Out of nothing more that idle curiosity, I am looking a utility which can display the time from several internet time servers at once. I also need to be able to set which time servers it interrogates. [...] Use ntpd + ntpq. ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. ntpq can be used to display the differences between the time servers polled by ntpd. Unless I be mistaken, there's no option for ntpd(8) /not/ to set the system clock. This means that (in contrast to ntpdate(8)), running ntpd(8) requires the respective privileges, which are unlikely to be available when running under an ordinary user account, or on a virtual server instance. (As in: to report the problem with the system clock being incorrectly set to the support.) -- FSF associate member #7257 http://sf-day.org/ ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
The point is that ntpd is probably running on all the boxes anyway, and ntpq can be used to collect the data from all of them. I would suggest also looking at using sntp (from ntp-dev) to do the monitoring, but it will want to talk to ntpd on the remote systems. H ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
