pdesh@Citicorp.COM (Peter Deshpande) (05/22/91)
Does anyone know a way to syncronize clocks on a network involving many (sun) workstations and servers? Is there any program out there (clock daemon) which could run on all the machines to keep the clocks in sync. Thanks in advance -- P. Deshpande -- Citicorp, New York VMS/UNIX Systems Manager - 212-291-4282 pdesh@Citicorp.COM uunet!ccorp!pdesh
george@news.cis.ohio-state.edu (George M. Jones) (05/22/91)
pdesh@Citicorp.COM (Peter Deshpande) writes:
Does anyone know a way to syncronize clocks on a network involving
many (sun) workstations and servers?
Is there any program out there (clock daemon) which could run on all
the machines to keep the clocks in sync.
Thanks in advance
Try ntp. I think you can get the latest via anonymous FTP
from louie.udel.edu in pub/ntp
---George
--
OSU Computer & Inf. Science 2036 Neil Ave.,Columbus,Ohio 43210. 614-292-7325
george@cis.ohio-state.edu or ...!osu-cis!george
Death is just nature's way of telling you to slow down a little.barnett@grymoire.crd.ge.com (Bruce Barnett) (05/22/91)
In article <1991May21.175317.12255@Citicorp.COM> pdesh@Citicorp.COM (Peter Deshpande) writes: > Does anyone know a way to syncronize clocks on a network involving > many (sun) workstations and servers? A simple solution is to add a rdate machine in each machine's crotab file. have the clients sync off the servers, and all of the servers sync off one stable server. This works on SUNOS, but on Ultrix machines, it seems to do an average of machines times. ntp is also a good solution. You get errors if the times are way out of date. Using rdate can cause problems if your master has the wrong time. -- Bruce G. Barnett barnett@crdgw1.ge.com uunet!crdgw1!barnett
bob@wizard.uucp (Bob Smith) (05/23/91)
In <1991May21.201152.9655@cis.ohio-state.edu> george@news.cis.ohio-state.edu (George M. Jones) writes: > pdesh@Citicorp.COM (Peter Deshpande) writes: > > Does anyone know a way to syncronize clocks on a network involving > many (sun) workstations and servers? > Is there any program out there (clock daemon) which could run on all > the machines to keep the clocks in sync. > Thanks in advance > Try ntp. I think you can get the latest via anonymous FTP > from louie.udel.edu in pub/ntp ...or... rdate will read the date/time from a specfied host and set the date/time of the local machine accordingly, I've never tried it, but it should be possible to cron up rdate periodically to keep clocks sync'd.(?) -- \ Bob Smith \_______________________________ \ 835 Mammoth Rd. \ Path: wybbs!wizard!bob \ Dracut, MA. 01826 \ Work/voice mail: 508-670-6712
vince@bcsaic.UUCP (Vince Skahan) (05/24/91)
In article <1991May23.014145.212@wizard.uucp> bob@wizard.uucp (Bob Smith) writes: >In <1991May21.201152.9655@cis.ohio-state.edu> george@news.cis.ohio-state.edu (George M. Jones) writes: > >> pdesh@Citicorp.COM (Peter Deshpande) writes: >> >> Does anyone know a way to syncronize clocks on a network involving >> many (sun) workstations and servers? I wrote a shell script that runs out of cron on one workstation with the master (by definition..."good") clock and goes out and does a rsh $system date xxxxxxxx command. It works pretty well in practice if you have one "group of systems" with the ability for root to do rsh's among systems in the group. let me know if you want a copy. It keeps my 75 systems to about 1 second either way. I've used "timed" on Apollos which also worked pretty well, but creates a measurable (but maybe insignificant) load on the systems. -- ---------------------------------------------------------------- Vince Skahan vince@atc.boeing.com ...uw-beaver!bcsaic!vince (lifelong Phillies fan...pity me)
jim@tiamat.fsc.com ( IT Manager) (05/31/91)
In article <1991May23.014145.212@wizard.uucp>, bob@wizard.uucp (Bob Smith) writes:
- rdate will read the date/time from a specfied host and set the date/time
- of the local machine accordingly, I've never tried it, but it should be
- possible to cron up rdate periodically to keep clocks sync'd.(?)
Is rdate publically available? Where?
Thanks.
-------------
James B. O'Connor jim@tiamat.fsc.com
Ahlstrom Filtration, Inc. 615/821-4022 x. 651scotts@qsp.COM (Scott Simpers) (05/31/91)
We use timed on our suns and other systems. It works just fine. Don't use it on apollo though... You can get a copy from uunet. Scott Simpers Quality Software Products voice: (213)410-0303 5711 W Slauson Avenue Suite 240 fax: (213)410-0124 Culver City, CA 90230 ...uunet!qsp!scotts
bill@unixland.natick.ma.us (Bill Heiser) (06/01/91)
>In article <1991May23.014145.212@wizard.uucp>, bob@wizard.uucp (Bob Smith) writes: >- rdate will read the date/time from a specfied host and set the date/time >- of the local machine accordingly, I've never tried it, but it should be >- possible to cron up rdate periodically to keep clocks sync'd.(?) > I'm using rdate on Sun/386i systems, syncing the time to a Harris sysvr3 system which is kept in sync to a WWV receiver. The Sun systems seem to drift very rapidly, being at least a second off within 12 hours or so of the sync. The same is true of another Harris machine which uses also uses rdate to sync to the Harris with the WWV. These systems are running rdate periodcally from cron (once per day). -- bill@unixland.natick.ma.us The Think_Tank BBS & Public Access Unix ...!uunet!think!unixland!bill bill@unixland ..!{uunet,bloom-beacon,esegue}!world!unixland!bill 508-655-3848 (2400) 508-651-8723 (9600-HST) 508-651-8733 (9600-PEP-V32)
gjalt@ele.tue.nl (Gjalt de Jong) (06/03/91)
In article <2403@maserati.qsp.UUCP> scotts@qsp.COM (Scott Simpers) writes:
We use timed on our suns and other systems. It works just fine. Don't use it
on apollo though...
Why not on apollo's?
We have used for some time without any problems. Well, after some time we
changed to ntp to get the 'real' time.
--
__
Gjalt G. de Jong, | Phone: +(31)40-473345
Eindhoven University of Technology, Dept. of Electr. Eng. (ES/EH 7.26)
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
Email: gjalt@es.ele.tue.nljlf@galaxy.East.Sun.COM (John "Do The Bartman" Furlani) (06/04/91)
> >In article <1991May23.014145.212@wizard.uucp>, bob@wizard.uucp (Bob Smith) writes: > >- rdate will read the date/time from a specfied host and set the date/time > >- of the local machine accordingly, I've never tried it, but it should be > >- possible to cron up rdate periodically to keep clocks sync'd.(?) > > > Hands down, then best way to synchronize clocks over a network is to use NTP (Network Time Protocol). We use this to keep our machines in sync within our own local netowork and throughout Sun. My fourteen servers stay within a few miliseconds of each other and my time server stays within a few miliseconds of Sun's time server. If you don't want to (as we don't) use NTP on all of your systems, the others can rdate to assorted time servers. NTP is public domain stuff. j. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ John L. Furlani VIPER MaBell: (919)460-8383 Sun Microsystems Internet: john.furlani@East.Sun.COM P.O. Box 13447 Uucp: sun!sunpix!furlani@uunet.uu.net RTP, NC 27709 "Mars is essentially in the same orbit ... somewhat the same distance from the Sun, which is very important. We have seen pictures where there are canals, we believe, and water. If there is water, that means there is oxygen. If oxygen, that means we can breathe." -- Vice Pres. Dan Quayle on Mars ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
de5@ornl.gov (Dave Sill) (06/04/91)
In article <988@sunpix.East.Sun.COM>, jlf@galaxy.East.Sun.COM (John "Do The Bartman" Furlani) writes: > >Hands down, then best way to synchronize clocks over a network is to use >NTP (Network Time Protocol). And the hands down best configuration is XNTP with a couple of broadcast servers. It's much, much, easier than settting up /etc/ntp.conf files on each system telling it which systems to synchronize to, and it uses less bandwidth too. -- Dave Sill (de5@ornl.gov) Tug on anything in nature and you will find Martin Marietta Energy Systems it connected to everything else. Workstation Support --John Muir
drich@dialogic.com (Dan Rich) (06/06/91)
In article <988@sunpix.East.Sun.COM>, jlf@galaxy.East.Sun.COM (John "Do The Bartman" Furlani) writes: >> >Hands down, then best way to synchronize clocks over a network is to use >NTP (Network Time Protocol). I won't argue with that, but has anyone managed to port it to System V? I started trying to compile it, but didn't have any luck. I even wrote a version of settimeofday() for USG, but haven't been able to find all of the system defines. -- Dan Rich | drich@dialogic.com || ...!uunet!dialogic!drich UNIX Systems Administrator | "Danger, you haven't seen the last of me!" Dialogic Corporation | "No, but the first of you turns my stomach!" (201) 334-1268 x213 | -- The Firesign Theatre's Nick Danger
scotts@qsp.COM (Scott Simpers) (06/06/91)
In article <GJALT.91Jun3094348@eutes3.ele.tue.nl> gjalt@ele.tue.nl (Gjalt de Jong) writes: >In article <2403@maserati.qsp.UUCP> scotts@qsp.COM (Scott Simpers) writes: > > We use timed on our suns and other systems. It works just fine. Don't use it > on apollo though... > >Why not on apollo's? My apologies for any misunderstandings. What I meant to say is that we don't use timed on our apollo's, not that there was a problem with running timed on apollo systems. Scott Simpers Quality Software Products voice: (213)410-0303 5711 W Slauson Avenue Suite 240 fax: (213)410-0124 Culver City, CA 90230 ...uunet!qsp!scotts
rodgers@maxwell.mmwb.ucsf.edu (R. P. C. Rodgers, M.D.) (06/07/91)
In article <988@sunpix.East.Sun.COM>, jlf@galaxy.East.Sun.COM (John "Do The Bartman" Furlani) writes: >> >Hands down, then best way to synchronize clocks over a network is to use >NTP (Network Time Protocol). Yes, but (at least at our site) this does not eliminate the need for something like a cron entry for rdate, as if the slave and master clocks get too far out of synch., ntp fails to synchronize them... Cheerio, Rick Rodgers R. P. C. Rodgers, M.D. (415)476-2957 (work) 664-0560 (home) UCSF Laurel Heights Campus UUCP: ...ucbvax.berkeley.edu!cca.ucsf.edu!rodgers 3333 California St., Suite 102 Internet: rodgers@maxwell.mmwb.ucsf.edu San Francisco CA 94118 USA BITNET: rodgers@ucsfcca