浅谈ntp server搭建
1)配置/etc/ntp.conf# vim /etc/ntp.conf
1 # For more information about this file, see the man pages
2 # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
3
4 driftfile /var/lib/ntp/drift
5
6 # Permit time synchronization with our time source, but do not
7 # permit the source to query or modify the service on this system.
8 restrict default kod nomodify notrap nopeer noquery
9 restrict -6 default kod nomodify notrap nopeer noquery
10
11 # Permit all access over the loopback interface. This could
12 # be tightened as well, but to do so would effect some of
13 # the administrative functions.
14 restrict 127.0.0.1
15 restrict -6 ::1
16
17 # Hosts on local network are less restricted.
18 #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
19 restrict 192.168.6.0 mask 255.255.252.0 nomodify
20
21 # Use public servers from the pool.ntp.org project.
22 # Please consider joining the pool (http://www.pool.ntp.org/join.html).
23 #server 0.centos.pool.ntp.org iburst
24 #server 1.centos.pool.ntp.org iburst
25 #server 2.centos.pool.ntp.org iburst
26 #server 3.centos.pool.ntp.org iburst
27 server asia.pool.ntp.org prefer
28 server 0.asia.pool.ntp.org
29 server 1.asia.pool.ntp.org
30 server 2.asia.pool.ntp.org
31 server time.nist.gov
32
33 #broadcast 192.168.1.255 autokey # broadcast server
...
2)NTP启动与端口检查：
# service ntpd start
Starting ntpd:
# chkconfig ntpd on
# chkconfig --list | grep ntp
ntpd 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭
ntpdate 0:关闭 1:关闭 2:关闭 3:关闭 4:关闭 5:关闭 6:关闭
# netstat -nutlp | grep ntp
udp 0 0 192.168.2.213:123 0.0.0.0:* 21798/ntpd
udp 0 0 192.168.6.213:123 0.0.0.0:* 21798/ntpd
udp 0 0 127.0.0.1:123 0.0.0.0:* 21798/ntpd
udp 0 0 0.0.0.0:123 0.0.0.0:* 21798/ntpd
udp 0 0 fe80::221:f6ff:fed4:d502:123 :::* 21798/ntpd
udp 0 0 fe80::221:f6ff:fed4:d501:123 :::* 21798/ntpd
udp 0 0 ::1:123 :::* 21798/ntpd
udp 0 0 :::123 :::* 21798/ntpd
3)ntp server与上联是否同步
#查看server与上联是否同步，时间校正约8279ms，每64s轮循更新一次。
# ntpstat
synchronised to NTP server (62.201.225.9) at stratum 3 ＃==>上层ntp
time correct to within 8279 ms ＃==>校正时间差
polling server every 64 s ＃==>下次同步时间
＃查看server与上联的状态
# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*time.iqnet.com62.201.214.162 2u 14664124 393.411 -101.29 40.435
-220.231.122.105123.204.45.116 4u 20 64377 341.475 58.745 47.945
+vps.jre655.com10.84.87.146 2u 24 64377 211.095 0.177 38.002
web10.hnshostin158.43.128.33 2u 17 64177 392.506 -134.76 39.146
+24.56.178.140 .ACTS. 1u 27 64377 282.739 -59.521 42.959
参数说明：
reomte server上联的ntp主机名或ip；
注意最左端符号；＊表示当前正使用的上层ntp；＋代表与本机server也有连接，作为侯选ntp
refid 给上层ntp提供时间校对的服务器
st 上层ntp stratum级别
when 上一次与上层ntp同步的时间，单位为秒。
poll 同步时间间隔
reach 已经同上层ntp同步更新的次数
delay 网络传输过程中的延迟时间，单位为10^(-6)s
offset 时间补偿，单位为10^(-3)s
jitter 系统时间与bios硬件时间差，单位为10^(-6)s
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