Linux-ntp-server+client

GMT/UTC/CST;
/etc/localtime,/usr/share/zoneinfo/* time zone file,/etc/profile plus TZ variable;
Hardware time RTC, system time; date,hwclock,tzselect;
/usr/share/zoneinfo/asia

Zdump Sichuan View the current time for each zone
# Hwclock--set--date= "Mm/dd/yy hh:mm:ss" Set hardware time we can set it up in the BIOS when booting. You can also use the Hwclock command
# date-s "Dd/mm/yyyy hh:mm:ss" It's easiest to modify the system time with the date command.

1. Set the time zone
GMT: Greenwich Time Zone
UTC: World coordinated Time zone
CST: China Standard Time zone
Cp/usr/share/zoneinfo/asia/shanghai/etc/localtime
Ln-sf/usr/share/zoneinfo/asia/shanghai/etc/localtime
If the time zone is not correct, delete,/etc/localtime, and then configure
Tzselect (5) asia--9) china--1) Beijing time

2.Command
# Hwclock--set--date= "Mm/dd/yy hh:mm:ss"
# date-s "Dd/mm/yyyy hh:mm:ss"
# Hwclock--SYSTOHC
# Hwclock--hctosys

3.NTP SERVER
Rpm-qa | grep NTP
Yum-y ntpd Install
http://www.pool.ntp.org
SERVER = cn.pool.ntp.org
Ntpdate cn.pool.ntp.org

/etc/ntp.conf

#server cn.pool.ntp.org
#fudge 127.127.1.0 stratum stratum
#driftfile/var/lib/ntp/ntp.drift
#restrict default Kod nomodify notrap nopeer noquery defaults to all operations denied by the client
#restrict 127.0.0.1 allow native address everything
#restrict 192.168.1.0 Mask 255.255.255.0 nomodify allows all clients in the LAN to connect to this server for synchronization time.

#/ETC/INIT.D/NTPD Start
# chkconfig--level ntpd on

# VI/ETC/SYSCONFIG/NTPD
Sync_hwclock=yes
Watch Ntpq-p

4.NTP Client Settings
/etc/ntp.conf
Server 192.168.1.105
Linux clients use
Ntpdate 92.168.1.105
# Hwclock--SYSTOHC

If the synchronization does not check successfully: Iptables need Disable or TCP 123

Linux-ntp-server+client