On 2011-03-22, bombjack <bombjac...@gmail.com> wrote: > On Mar 22, 4:20?pm, "Richard B. Gilbert" <rgilber...@comcast.net> > wrote: >> On 3/22/2011 2:56 AM, prashant sherin wrote: >> >> >> >> >> >> >> >> >> >> >> ntpd is intended to for continuous, not periodic running. ?You are not >> >> using it correctly. >> >> >> Cheers, >> >> David >> >> > Thanks for the quick reply. >> > ntpd does allow us to run this way. From the ntpd man page: >> >> > ? -q ? ? ?Exit the ntpd just after the first time the clock is set. >> > This behavior mimics that of the ntpdate program, which is to be >> > retired. The -g and -x ?options ?can >> > ? ? ? ? ? ? ? ? be used with this option. Note: The kernel time >> > discipline is disabled with this option. >> >> > The idea is to use it as ntp client. >> >> > Thanks and Regards, >> > Prashant >> >> The fact that it's possible to use NTPD that way does NOT mean that it >> is anywhere close to using NTPD as designed nor is it the best way for >> most purposes! ?You could do almost as well by setting the time from >> from my wrist watch which uses VLF radio to receive time broadcasts. >> >> "Normal usage" is to run NTPD 24 hours a day, 365 days a year or 366 on >> leap years. > > Hi, > First: Thanks for quick response > > I am fully aware fo how ntpd should be used, i.e. 24/7/365, but that > is not what I am asking for. As I stated above, I need to make sure > the system clock is roughly (your wrist watch would do) the correct > time ASAP during boot as other systems will use this time and can't > easily be changed later if time deviates too much when ntpd (later) > has initial sync. I presume you are aware of that ntpd will take some > samples/time before syncing and that is not good enough. therefore, I > still wonder if ntpd -q could be used in favour of rdate?
Yes. It is far better than rdate. IF you want rapid convergence, and you are running linux/bsd, you might have a look at chrony which has far more rapid convergence of the time, can be set up to initially step the clock to the right time (as can I beleive ntp) and disciplines the clock to tighter tolerances than does ntpd. > > thanks, > Fredrik _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
