Re: ntp synchronisation failed

From: Corné Beerse (cbeerse_at_lycos.nl)
Date: 06/29/04

  • Next message: Alexander Dalloz: "Re: Can't work virtusertable in FC1" 
    Date: Tue, 29 Jun 2004 15:48:31 +0200
To: For users of Fedora Core releases <fedora-list@redhat.com>

    T. Nifty Hat Mitchell wrote:

    > On Thu, Jun 24, 2004 at 08:34:02PM +0200, Eric Tanguy wrote:
    >
    >
    >>In the boot process the ntp synchronisation failed whereas after the
    >>time synchronization is all right. Why ? may be because i use
    >>firestarter ?
    >
    >
    > If you have friends running Linux/Fedora exchange NTP privileges.
    >
    > First look at how ntpd is started for you.
    >
    > In general you will find that the initial connection using ntpdate
    > times out for various normal reasons. As a result the return status
    > is an error.

    You can chech for this behavoure to do a ping to the ntp-server. If you ping 3
    to 5 times, you will see the first ping takes longer than the others. Most
    likely, after this ping (before the ntpd-start) the first ntp query also succeeds.

    Specially if you call the ntp-server by name, the IP-address is not cashed jet
    and hence a dns-query must be made. Since it is at boot time, most likely all
    routings and such also need to be setup.

    If you have pinged the ntp-server (even only once!), all routers and name-caches
    are filled and the ntp-query can go strait on and will be substantial faster.

    >
    > If you check back +15 min later things will be fine when ntpd has had time
    > to make some connections.

    However, if you start ntp only 15 minutes later, it is likely that the first
    call still is a little late.

    >
    > Note that /etc/init.d/ntpd first starts ntpdate then ntpd. It is not
    > uncommon for ntpdate to fail in the early stages of booting a system
    > for a list of reasons...

    Not necessarily, newer ntpd-s have ntp-date build in and do that themself. If it
    is done separatly, this ntp-date will walk the paths for the next ntpd-s.

    >
    > Do, find a ntp time service local to you.
    > Based on the mail headers, perhaps ntp.univ-nantes.fr
    >
    > or look here... http://www.eecis.udel.edu/~mills/ntp/clock2b.html

    nice list.

    >
    > # FR ntp.obspm.fr
    > Location: BNM-SYRTE, Observatoire de Paris, Paris, France
    > Synchronization: NTP V4 secondary (stratum-2), i386/Linux
    > Service Area: France/Europe
    > Access Policy: open access, but please send a message to notify
    > Contact: info.bnm-syrte@obspm.fr, More Informations?
    > Note: use DNS for IP address.
    >
    > If you have friends running Linux/Fedora exchange NTP privileges with each other!
    >
    > 

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