FreeBSD NTP 简单使用

来源 https://blog.csdn.net/stevexk/article/details/1349506

1.ntptrace xxx.xxx.xxx.xxx
查找要对时的服务器状态，可以trace到一级时钟服务器，
2.ntpq -p 或者 ntpq -pn
显示当前时钟服务器状态
3.ntpdata xxx.xxx.xxx.xxx 或者 ntpdata -d xxx.xxx.xxx.xxx (Debug模式)
与时钟服务器对时，着先时钟服务器要先对时，才能用来提钟时钟服务
4.ntpd
既可以自动对时，又可对外提供时钟服务，先要配置/etc/ntp.conf

restrict 0.0.0.0 mask 0.0.0.0 notrust nomodify notrap //控制访问

server xxx.xxx.xxx.xxx //对时的外部服务器

server 127.127.1.0

fudge 127.127.1.0 stratum 10

driftfile /etc/ntpd.drift

5.开机对时，/etc/rc.conf中添加
ntpdate_enable="YES"
ntpdate_program="/usr/sbin/ntpdate"
ntpdate_flags="-b"

6.每天(好像是每天)对时且对外提供时钟服务, 在/etc/rc.conf中添加

xntpd_enable="YES"
xntpd_program="/usr/sbin/ntpd"
xntpd_flags="-p /var/run/ntpd.pid"

7.端口
时钟服务器端口为123，udp , netstat -an

# 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

server 182.92.12.11 minpoll 6 maxpoll 10 
restrict 182.92.12.11 nomodify notrap nopeer noquery

/etc/ntp.common.conf

# Common elements of NTP configuration
#
# 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

/etc/ntp.conf

includefile /etc/ntp.common.conf
server 218.75.4.130 minpoll 6 maxpoll 10 
restrict 218.75.4.130 nomodify notrap nopeer noquery

常用的Ntp服务器：

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