NTP Server Setup

In an Oracle 10G environment, if you want to build a cluster, you need to synchronize the clock, which requires an NTP server.

1, on the timing system machine, edit/etc/ntp.conf

Retrict default Nomodify
Restrict 127.0.0.1
Server 127.127.1.0
Fudge 127.127.1.0 Stratum 8
Driftfile/var/lib/ntp/drift
Broadcastdelay 0.008

Then restart the NTPD service

Service NTPD Restart

2, on the other host to synchronize the clock can

Ntpdate xxxxx

More is run automatically in Crond

Crontab-e

*/5 * * * */usr/sbin/ntpdate xxxxx

Sync every five minutes

Problems encountered:

1, ntpdate[6480]: No server suitable for synchronization found
Use ntpdate-d xxxx to view

10.0.0.1:server Dropped:strata too high

Stratum 16

Normally, stratum is between 0 and 15, which means that NTP server is not synchronized with itself or its server.

After you join Fudge 127.127.1.0 stratum 8, after you restart the NTP service on an NTP server, the NTP server itself or the synchronization with its server takes a period of time, about a few minutes.

Use ntpq-p xxxxxx to view its status

REMOTEREFIDST T when poll reachdelayoffsetjitter
==============================================================================
*local (0). LOCL.8 l62643770.0000.0000.001

That means it's normal.

You can use Ntpdate to synchronize time.

NTP Server Setup