Linux time synchronization method 2

1. synchronize with a known time server

2. Configure the Network Time Protocol (NTP)

1. Enable Linux to automatically synchronize time

VI/etc/crontab
Add the following sentence:
00 0 1 ** root rdate-s time.nist.gov

Time.nist.gov is a time server.

2. Time Server Configuration (192.168.10.1)

1) .. # rpm-IVH ntp-4.1.2-4.EL3.1.i386.rpm
2). # vi/etc/NTP. conf
Comment a line
Restrict default ignore
Add a row
Restrict 192.168.10.0 mask 255.255.255.0 notrust nomodify notrap
3). # vi/etc/NTP/step-tickers
Add a row
Pool.ntp.org
In this way, the international standard time server will be automatically connected each time ntpd is started;
4). # service ntpd start
5). # netstat-an | grep 123
Make sure that the port is opened in UDP mode.

Time client configuration (192.168.10.2)
1). # ntpdate 192.168.10.2
The synchronization is successful.
2). # crond-e
Join
0-59/10 ****/usr/sbin/ntpdate 192.168.10.1
Indicates the synchronization time every 10 minutes.