???????

????ntp???udpЭ?飬????????123????

???????NTPD

????????NTP??????????????????????????????У?

????#chkconfig ntpd on

???????ntpd??

????service ntpd start

????NTP??????????

????????????????“ntpdate ??????IP”????????

????????????crond???????????

??????root?????????????????

????[root@supersun root]# crontab -e

?????????????????15?????????????

????15 * * * * ntpdate ??????IP

?????????ntpdate?????????ntp??????У????????????????????

????????????????????????????????

???????????????????????????????????

????#ntpq -p

????????????????????????????????????????????jitter???4000????delay??reach?????0??

?????????????У?

?????з???????????server??????????123???????????????

???????????????NTP????????????3??5?????????????server????????????????????????????????“ntpdate ??????ip”??????????

????27 Jun 10:20:17 ntpdate[21920]: no server suitable for synchronization found

????Network Time Protocol(NTP?????????Э??)????????????п???????????NTP??????????????????????????????NTP?????????????????????????????????????????п?????????????

??????????????????????????????е????????????????????????????????й?????????????????????????????????????????????????У????????????????????????????????????????????????????????????????

??????? ????Linux??ntp????????

????1. ?????????

???????linux???????ж???????ntp??????????????ɡ???????????????

#/tmp/wget http://ntp.buptnet.edu.cn/ntp_chinese/down/server/ntp-4.2.0.tar.gz
# tar -zxvf ntp-4.2.0.tar.gz –C /usr/local/src;cd /usr/local/src/ntp-4.2.0

????2. ????趨???????????????

#./configure --prefix=/usr/local/ntp --enable-all-clocks --enable-parse-clocks
make clean ; make
make check
make install

?????????ɡ?

???????????NTP????????????

????1??NTP?????????????????

????NTP?????????????????????????1 ??

??????1 NTP????????????

?????? NTP ????????й??????????????????????2 ??

??????2 ?? NTP ????????й????????

?????????Linux ??????????????????????Windows????????? Windows????????Linux????????????(System Clock)?????(Real Time Clock?????RTC)???????????????????Linux Kernel?е????????????????????????????????????????????????????????BIOS??“Standard BIOS Feture”???н??????á???Linux???????????????????????????????????????????????????