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# yum install ntp
»òÕß´Ó°²×°Å̲éÕÒ ntp µÄrpm °ü°²×°
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# crontab -e
¼ÓÈëÒ»ÐУº
*/15 * * * * ntpdate 210.72.145.44
210.72.145.44 ΪÖйú¹ú¼ÒÊÚʱÖÐÐÄ·þÎñÆ÷µØÖ·£¬ÕâÑù¸Ã»ú¾Í¿ÉÒÔÓë¹ú¼ÒÊÚʱÖÐÐĽøÐÐͬ²½ÁË¡£
Òª¼ÜÉè±¾µØÊ±¼ä·þÎñÆ÷£¬Ö»ÐèÒªÐÞ¸Ä /etc/ntp.confÎļþÀïµÄ¼¸¸ö¼òµ¥µÄÅäÖþͿÉÒÔÁË£¬ÒÔÏÂÊÇÎÒÌí¼ÓµÄÅäÖãº
#add by Liu Li
server 210.72.145.44 prefer
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server 218.21.130.42
£¨cn.pool.ntp.orgµÄIP)
restrict 192.168.100.0 mask 255.255.255.0
nomodify
(ÔÊÐíÄÚÍøÍ¨Ñ¶
)
restrict 0.0.0.0 mask 0.0.0.0 nomodify
notrap noquery notrust
£¨ÆÁ±ÎÆäËûIP
¹ýÀ´¸üÐÂʱ¼ä
£©
ÆäËûµÄ±£³ÖĬÈϲ»¶¯¡£
ΪÁËʹNTP·þÎñ¿ÉÒÔÔÚϵͳÒýµ¼µÄʱºò×Ô¶¯Æô¶¯£¬Ö´ÐУº
# chkconfig ntpd on
Æô¶¯/¹Ø±Õ/ÖØÆôNTPµÄÃüÁîÊÇ£º
# /etc/init.d/ntpd start
# /etc/init.d/ntpd stop
# /etc/init.d/ntpd restart
½«Í¬²½ºÃµÄʱ¼äдµ½CMOSÀï
vi /etc/sysconfig/ntpd
SYNC_HWCLOCK=yes
ÇмÇÿ´ÎÐÞ¸ÄÁËÅäÖÃÎļþºó¶¼ÐèÒªÖØÐÂÆô¶¯·þÎñÀ´Ê¹ÅäÖÃÉúЧ¡£¿ÉÒÔʹÓÃÏÂÃæµÄÃüÁîÀ´¼ì²éNTP·þÎñÊÇ·ñÆô¶¯£¬ÄãÓ¦¸Ã¿ÉÒԵõ½Ò»¸ö½ø³ÌIDºÅ£º
# pgrep ntpd
ʹÓÃÏÂÃæµÄÃüÁî¼ì²éʱ¼ä·þÎñÆ÷ͬ²½µÄ״̬£º
# ntpq -p
ÓÃntpstat Ò²¿ÉÒԲ鿴һЩͬ²½×´Ì¬£¬ÓÃnetstat -ntlup²é¿´¶Ë¿ÚʹÓÃÇé¿ö£¡
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# crontab -e
¼ÓÈëÒ»ÐУº
*/15 * * * * ntpdate ·þÎñÆ÷¶ËIP¡£
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