How to configure automatic time synchronization on Linux cloud server

Time synchronization command:

ntpdata time.windows.com

Automatic time synchronization:

Need to configure the /etc/crontab file to automatically execute tasks and allow Linux to automatically synchronize 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 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

In this way, every time ntpd starts, it will automatically connect to the international standard time server

 # service ntpd start
 # netstat -an |grep 123

Make sure the port is open in udp mode

Time client configuration (192.168.10.2)

 # ntpdate 192.168.10.2

Should show successful synchronization

# crond -e

Join

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

means synchronizing time every 10 minutes

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