How to configure automatic time synchronization for Linux Exadata

Time synchronization command:

ntpdata time.windows.com

Automatic time synchronization:

You need to configure the /etc/crontab file to automatically execute the task and let linux automatically synchronize the time from time.windows.com.

vi /etc/crontab

Add a sentence:

00 0 1 * * root ntpdate -s time.windows.com

Time.nist.gov is a time server.

Linux Time Server Configuration (192.168.10.1)

# rpm -ivh ntp-4.1.2-4.EL3.1.i386.rpm# vi /etc/ntp.conf

Comment on a line

restrict default ignore

Add a line

restrict 192.168.10.0 mask 255.255.255.0 notrust nomodify notrap# vi /etc/ntp/step-tickers

Add a line

pool.ntp.org

So that every time ntpd is started, it will automatically connect to the international standard time server.

# service ntpd start # netstat -an |grep 123

Make sure that the port is open in udp.

Time Client Configuration (192.168.10.2)

# ntpdate 192.168.10.2

Synchronization should be displayed successfully.

# crond -e

join

0-59/10 * * * * /usr/sbin/ntpdate 192.168.10.1

Indicates that the time is synchronized every 10 minutes.