[ntp:questions] Re: NTP masters and slaves
kostecke at ntp.isc.org
Tue Nov 22 00:59:20 UTC 2005
On 2005-11-20, Jacob Friis Saxberg <webcom.dk at gmail.com> wrote:
> We have servers that we would like to be in sync via NTP. Below
> is the ntp.conf of our main server with the internal IP address
> Could I just put "server 192.168.100.10" in the ntp.conf of all our
> clients to make them sync to the main server?
Yes. If you use iburst on your server lines you will reduce the intial
synchronization time from ~8 minutes to ~20 seconds. Your server lines
on the "client" should look like:
server 192.168.100.10 iburst
Don't forget to specify a drift file on the "clients".
Since you're having your clients depend on only one time server you need
to make sure that this server stays up and on time.
I suggest making the following changes to your main server ntp.conf:
> driftfile /etc/ntp/drift
> server 127.127.1.0
> fudge 127.127.1.0 stratum 10
> server pool.ntp.org
Increase the number of pool servers that you're using to 4, or more.
This will allow your "main server" to detect a bad time server. You may
be able to repeat the following line 4, or more, times:
server pool.ntp.org iburst
If you have resolver problems (i.e. you don't get different IP addresses
for each pool.ntp.org line, you may need to use some numbered sub-zones.
See the example at http://ntp.isc.org/Servers/NTPPoolServers
The following three lines aren't doing anything for you:
> broadcastdelay 0.008
> authenticate no
Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/
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