This topic outlines how to configure a Network Time Protocol
(NTP) server to ensure that all servers that the instance runs on
have similar time settings.
About this task
By default, the NTP server is setup
and configuration is handled by the DB2® installer.
Procedure
To configure hosts as NTP clients:
- Specify the NTP server to synchronize to. Open
the /etc/ntp.conf file and add the following
lines:
server ntp_server_hostname
driftfile /etc/ntp.drift
tracefile /etc/ntp.trace
where ntp_server_hostname represents
the hostname or IP address of an NTP server. If you do not have access
to an existing NTP server, refer to the "Setting up an NTP Server" topic.
- Configure the NTP server to start at system restart:
- Start the NTP server:
- On AIX operating systems,
run the startsrc -s xntpd command.
- On Linux operating systems,
run the server ntp start command.
- Verify that the daemon is synchronized. If the daemon is
significantly not synchronized with the system clock, it can take
over 10 minutes for it to become synchronized. To ensure
the daemon is synchronized before continuing you can check the "sys
stratum" field:
- On AIX operating systems,
use the output of the lssrc -ls xntpd command.
- On Linux operating systems,
use the output of the ntptrace command.
The sys stratum field should be less then 16
to continue to the next step.
- Finish the synchronization process by running the ntpdate
-d ntp_server_hostname command.