**
1.ntptrace ***.***.***.***
查詢要對時的伺服器狀態，可以trace到一級時鐘伺服器，
2.ntpq -p 或者 ntpq -pn
顯示當前時鐘伺服器狀態
3.ntpdata ***.***.***.*** 或者 ntpdata -d ***.***.***.*** (debug模式)
與時鐘伺服器對時，著先時鐘伺服器要先對時，才能用來提鍾時鐘服務
4.ntpd
既可以自動對時，又可對外提供時鐘服務，先要配置/etc/ntp.conf
5.開機對時，/etc/rc.conf中新增
ntpdate_enable="yes"
ntpdate_program="/usr/sbin/ntpdate"
ntpdate_flags="-b"
6.每天(好像是每天)對時且對外提供時鐘服務, 在/etc/rc.conf中新增
xntpd_enable="yes"
xntpd_program="/usr/sbin/ntpd"
xntpd_flags="-p /var/run/ntpd.pid"
7.埠
時鐘伺服器端口為123，udp , netstat -an
# we won't allow *anything* from hosts not listed in the configuration/etc/ntp.common.conf# this means you need a restrict line for each server
restrict default ignore
restrict -6 default ignore
# allow just about anything from localhost, ipv4.
restrict 127.0.0.1 mask 255.0.0.0
restrict 127.0.0.1
restrict -6 ::1
driftfile /var/tmp/ntp.drift
logfile /var/log/ntpd.log
# log everything, even from ntpd (which otherwise defaults to "all =sync")
logconfig =all +all
server 127.127.1.0
fudge 127.127.1.0 stratum 5
server 182.92.12.11 minpoll 6 maxpoll 10
restrict 182.92.12.11 nomodify notrap nopeer noquery
# common elements of ntp configuration/etc/ntp.conf## do not edit: changes will be lost following reboot.
# for site-specific ntp configuration, see the instructions in /etc/ntp.conf
## we won't allow *anything* from hosts not listed in the configuration
# this means you need a restrict line for each server
restrict default ignore
restrict -6 default ignore
# allow just about anything from localhost, ipv4.
restrict 127.0.0.1 mask 255.0.0.0
restrict 127.0.0.1
restrict -6 ::1
driftfile /var/tmp/ntp.drift
logfile /var/log/ntpd.log
# log everything, even from ntpd (which otherwise defaults to "all =sync")
logconfig =all +all
server 127.127.1.0
fudge 127.127.1.0 stratum 5
includefile /etc/ntp.common.conf常用的ntp伺服器：server 218.75.4.130 minpoll 6 maxpoll 10
restrict 218.75.4.130 nomodify notrap nopeer noquery
203.107.6.88
ntp.aliyun.com
ntp1.aliyun.com
ntp2.aliyun.com
ntp3.aliyun.com
ntp4.aliyun.com
ntp5.aliyun.com
ntp6.aliyun.com
ntp7.aliyun.com
ntp8.aliyun.com
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