[ntp:questions] Tricking NTP's driftfile
oberman at es.net
Tue Jun 24 17:51:34 UTC 2008
> Date: Mon, 23 Jun 2008 18:11:18 -0400
> From: Steven <sed_facebook at vt.edu>
> Sender: questions-bounces+oberman=es.net at lists.ntp.org
> System Information:
> At work, I am configuring a system which consists of six servers (master,
> slave1, ... slave5) networked together but kept isolated from any external
> The ONLY time requirement is that all the systems have the same time,
> which does NOT need to be accurate, just consistent.
> All servers run RHEL4 and use ntp-4.2.0.a.20040617-6.el4.
> All systems: (all files owned by root unless specified)
> /etc/ntp.conf 644
> server 127.127.1.0
> server master # LINE NOT INCLUDED ON master
> driftfile /var/lib/ntp/drift
> broadcastdelay 0.08
> /etc/ntp 755
> /etc/ntp/keys 600: Only commented lines
> /etc/ntpservers 644: Default (redhat time servers)
> /etc/step-tickers 644: slave: master, master: empty
> /var/lib/ntp/drift 644 (ntp:ntp): 0.0
> While the master goes through its synchronization routine (~10 mins),
> the slaves cannot obtain the time (see below). Even after the master
> is responsive, the drift file is not written to.
> [root at slave1 ~]# ntpdate -d master
> 192.168.1.1: Server dropped: strata too high
> 23 Jun 17:28:33 ntpdate : no server suitable for synchronization found
OK. Why is it taking ~10 minutes to sync?
This one I see fairly often and I don't understand it. My systems
typically are synced and available for use in <3 minutes.
Do you use iburst and -g? If so, that should get the master synced very
quickly and your clients should be able to start their own sync, also
I have not been following this thread, so this my already have been
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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