It appears all I needed was to replace the "tos orphan 5" in the TK1's ntp.conf file with:
server 127.127.1.0 fudge 127.127.1.0 stratum 5 I had tried using the fudge line earlier, but I think I substituted the actual IP address of the TK1 and omitted the server 127.127.1.0 line. I also commented out server lines for internet servers that weren't available. Thanks for your help on this. Thanks, Jason On Mon, Aug 15, 2016 at 8:00 AM, <questions-requ...@lists.ntp.org> wrote: > Send questions mailing list submissions to > questions@lists.ntp.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.ntp.org/listinfo/questions > or, via email, send a message with subject or body 'help' to > questions-requ...@lists.ntp.org > > You can reach the person managing the list at > questions-ow...@lists.ntp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of questions digest..." > > > Today's Topics: > > 1. Use ntp orphan mode to sync time two stand-alone computers > (Jason Beach) > 2. Re: Use ntp orphan mode to sync time two stand-alone > computers (Brian Inglis) > 3. Re: Use ntp orphan mode to sync time two stand-alone > computers (Miroslav Lichvar) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 13 Aug 2016 21:28:52 -0400 > From: Jason Beach <jason.m.be...@gmail.com> > To: questions@lists.ntp.org > Subject: [ntp:questions] Use ntp orphan mode to sync time two > stand-alone computers > Message-ID: > <CAEjinXDeN6kgT_+Af-Kev17DQQEZekum0R+ > nwrhlh9v6br9...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > I have two arm-based Linux (ubuntu 14.04) computers, a Jetson TK1 and TX1 > that will fly on a multicopter and hence have no internet connection (they > are networked together onboard). They also do not have RTC's built-in but > I have added a smll external one (https://www.adafruit.com/product/255) to > the Jetston TK1. The TK1's time gets set on boot from this RTC no problem > (using a `sudo hwclock -s -f /dev/rtc0` in rc.local). I am trying to get > the TX1 to sync to the TK1's time using ntp. > > The TK1's ntp.conf file contains: > > driftfile /var/lib/ntp/ntp.drift > > server 0.us.pool.ntp.org > server 1.us.pool.ntp.org > server 2.us.pool.ntp.org > server 3.us.pool.ntp.org > > tos orphan 5 > > The TX1's ntp.conf file contains: > > driftfile /var/lib/ntp/ntp.drift > > # Specify one or more NTP servers. > > server 10.20.3.149 iburst prefer > > server 0.ubuntu.pool.ntp.org > server 1.ubuntu.pool.ntp.org > server 2.ubuntu.pool.ntp.org > server 3.ubuntu.pool.ntp.org > > where 10.20.3.149 is the IP address of the TK-1. If I run `ntpq -p` I get > > remote refid st t when poll reach delay offset > jitter > > ============================================================ > ================== > 192.168.0.10 .INIT. 16 - - 512 0 0.000 0.000 > 0.000 > 192.168.3.149 .INIT. 16 - - 512 0 0.000 0.000 > 0.000 > > and if I run `ntpdate -dv 10.20.3.149` I get > > 12 Aug 12:36:23 ntpdate[2197]: ntpdate 4.2.6p5@1.2349-o Thu Feb 11 > 18:30:14 UTC 2016 (1) > Looking for host 10.20.3.149 and service ntp > host found : TK-Astro > transmit(10.20.3.149) > receive(10.20.3.149) > transmit(10.20.3.149) > receive(10.20.3.149) > transmit(10.20.3.149) > receive(10.20.3.149) > transmit(10.20.3.149) > receive(10.20.3.149) > 10.20.3.149: Server dropped: Server has gone too long without sync > server 10.20.3.149, port 123 > stratum 5, precision -22, leap 00, trust 000 > refid [10.20.3.149], delay 0.02838, dispersion 0.00037 > transmitted 4, in filter 4 > reference time: 00000000.00000000 Sun, Dec 31 1899 19:00:00.000 > originate timestamp: db58798a.31270a17 Fri, Aug 12 2016 12:36:26.192 > transmit timestamp: db58798e.185b391c Fri, Aug 12 2016 12:36:30.095 > filter delay: 0.02843 0.02838 0.02869 0.02863 > 0.00000 0.00000 0.00000 0.00000 > filter offset: -3.90380 -3.90424 -3.90470 -3.90468 > 0.000000 0.000000 0.000000 0.000000 > delay 0.02838, dispersion 0.00037 > offset -3.904242 > > 12 Aug 12:36:30 ntpdate[2197]: no server suitable for synchronization > found > > I see the reference time is way off (even though the system time is > correct) - is that what's triggering the message `Server has gone too long > without a sync`? I don't care if the time isn't 100% exactly right as long > as the two boards are synced together. Is there a way to force the two > boards to sync regardless of when the last server sync was? > > Thanks, > Jason > > > ------------------------------ > > Message: 2 > Date: Sun, 14 Aug 2016 11:00:22 -0600 > From: Brian Inglis <brian.ing...@systematicsw.ab.ca> > To: questions@lists.ntp.org > Subject: Re: [ntp:questions] Use ntp orphan mode to sync time two > stand-alone computers > Message-ID: <4f106def-e56f-6256-2a76-b34f9759c...@systematicsw.ab.ca> > Content-Type: text/plain; charset=utf-8; format=flowed > > On 2016-08-13 19:28, Jason Beach wrote: > > I have two arm-based Linux (ubuntu 14.04) computers, a Jetson TK1 and TX1 > > that will fly on a multicopter and hence have no internet connection > (they > > are networked together onboard). They also do not have RTC's built-in > but > > I have added a smll external one (https://www.adafruit.com/product/255) > to > > the Jetston TK1. The TK1's time gets set on boot from this RTC no > problem > > (using a `sudo hwclock -s -f /dev/rtc0` in rc.local). I am trying to get > > the TX1 to sync to the TK1's time using ntp. > > > I see the reference time is way off (even though the system time is > > correct) - is that what's triggering the message `Server has gone too > long > > without a sync`? I don't care if the time isn't 100% exactly right as > long > > as the two boards are synced together. Is there a way to force the two > > boards to sync regardless of when the last server sync was? > > Remove all inaccessible internet servers as they will make it impossible > for the systems to sync; define each system to the other; then see docs > about setting up Orphan Mode: > > http://doc.ntp.org/cgi-bin/htsearch?method=and&sort= > score&restrict=4.2.6p5&words=orphan+mode > > -- > Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada > > > ------------------------------ > > Message: 3 > Date: Mon, 15 Aug 2016 11:38:26 +0200 > From: Miroslav Lichvar <mlich...@redhat.com> > To: questions@lists.ntp.org > Subject: Re: [ntp:questions] Use ntp orphan mode to sync time two > stand-alone computers > Message-ID: <20160815093826.GB22836@localhost> > Content-Type: text/plain; charset=us-ascii > > On Sat, Aug 13, 2016 at 09:28:52PM -0400, Jason Beach wrote: > > I have two arm-based Linux (ubuntu 14.04) computers, a Jetson TK1 and TX1 > > that will fly on a multicopter and hence have no internet connection > (they > > are networked together onboard). They also do not have RTC's built-in > but > > I have added a smll external one (https://www.adafruit.com/product/255) > to > > the Jetston TK1. The TK1's time gets set on boot from this RTC no > problem > > (using a `sudo hwclock -s -f /dev/rtc0` in rc.local). I am trying to get > > the TX1 to sync to the TK1's time using ntp. > > If you need to sync one machine to another, you should use the LOCAL > driver (127.127.1.0) and not the orphan mode. Orphan mode is for cases > where a server should be automatically selected from a group of > unsynchronised servers. In your case only machine can be a server (the > one with RTC). > > -- > Miroslav Lichvar > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > questions mailing list > questions@lists.ntp.org > http://lists.ntp.org/listinfo/questions > > ------------------------------ > > End of questions Digest, Vol 142, Issue 1 > ***************************************** > _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
