CentOS NTP时间服务器配置
[root@desktop2 ~]# yum -y install ntp
2、NTP服务的配置
[root@desktop2 ~]# grep -v "^#" /etc/ntp.conf
driftfile /var/lib/ntp/drift
restrict default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
restrict 192.168.0.0 mask 255.255.255.0 nomodify notrap 允许局域网访问
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap 允许局域网访问
server 210.72.145.44 ---公网的地址
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
logfile /var/log/ntp
[root@desktop2 ~]# cat /etc/ntp/step-tickers //当NTP服务启动时,会自动与该文件中的记录的上层NTP服务进行时间校对
# List of servers used for initial synchronization.
192.168.0.254
[root@desktop2 ~]# cat /etc/sysconfig/ntpd //允许BIOS与系统时间同步
# Drop root to id 'ntp:ntp' by default.
SYNC_HWCLOCK=yes
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -g"
3、启动NTP服务
[root@desktop2 ~]# service ntpd start
[root@desktop2 ~]# chkconfig ntpd on
4、NTP的测试
[root@desktop2 ~]# ntpstat
synchronised to NTP server (192.168.0.254) at stratum 12 //进行时间校对的NTP服务器
time correct to within 958 ms //本地与上层NTP服务器的时间差
polling server every 64 s //下次同步时间
[root@desktop2 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*instructor.exam LOCAL(0) 11 u 26 64 377 0.807 0.030 0.219
LOCAL(0) .LOCL. 10 l 27 64 377 0.000 0.000 0.000
NTP占用的端口是123
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