# grep ^[^#] /etc/ntp.conf driftfile /var/lib/ntp/drift restrict default nomodify notrap nopeer noquery restrict 127.0.0.1 restrict ::1 server 0.centos.pool.ntp.org iburst server 1.centos.pool.ntp.org iburst server 2.centos.pool.ntp.org iburst server 3.centos.pool.ntp.org iburst includefile /etc/ntp/crypto/pw keys /etc/ntp/keys disable monitor
# grep ^[^#] /etc/ntp.conf driftfile /var/lib/ntp/drift restrict default nomodify notrap restrict 127.0.0.1 restrict ::1 server 0.centos.pool.ntp.org iburst server 1.centos.pool.ntp.org iburst server 2.centos.pool.ntp.org iburst server 3.centos.pool.ntp.org iburst includefile /etc/ntp/crypto/pw keys /etc/ntp/keys disable monitor
# grep ^[^#] /etc/ntp.conf driftfile /var/lib/ntp/drift restrict default nomodify notrap nopeer noquery restrict 127.0.0.1 restrict ::1 restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap server 0.centos.pool.ntp.org iburst server 1.centos.pool.ntp.org iburst server 2.centos.ntp.org iburst server 3.centos.pool.ntp.org iburst includefile /etc/ntp/crypto/pw keys /etc/ntp/keys disable monitor
# netstat -tlunp | grep ntp udp 0 0 192.168.1.101:123 0.0.0.0:* 2563/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 2563/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 2563/ntpd udp6 0 0 fe80::20c:29ff:fe7b:123 :::* 2563/ntpd udp6 0 0 ::1:123 :::* 2563/ntpd udp6 0 0 :::123 :::* 2563/ntpd
# ntpstat synchronised to NTP server (120.25.108.11) at stratum 3 time correct to within 99 ms polling server every 64 s
# ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== news.neu.edu.cn .INIT. 16 u - 64 0 0.000 0.000 0.000 x202.118.1.130 202.118.1.47 2 u 7 64 377 153.659 9.605 19.941 *time4.aliyun.co 10.137.38.86 2 u 10 64 377 39.666 -47.661 15.944 remote - 本机和上层ntp的ip或主机名,“+”表示优先,“*”表示次优先 refid - 参考上一层ntp主机地址 st - stratum阶层 when - 多少秒前曾经同步过时间 poll - 下次更新在多少秒后 reach - 已经向上层ntp服务器要求更新的次数 delay - 网络延迟 offset - 时间补偿 jitter - 系统时间与bios时间差
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