/ etc / ntp.conf中描述的配置信息。
NTP查询，是一个本地网络，从网络192.168.100.0/24是允许的。
在本地网络上的设备可以与NTP时间服务器同步。
NTP服务器本身的服务器和时间同步。
ntp.nict.jp
1.centos.pool.ntp.org
2.centos.pool.ntp.org
我们允许 192.168.100.0 ntp查询，从下面的描述中。
restrict 192.168.100.0 mask 255.255.255.0 nomodify notrap
[root@ntp01 ~]# more /etc/ntp.conf
# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
driftfile /var/lib/ntp/drift
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 192.168.100.0 mask 255.255.255.0 nomodify notrap
# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict -6 ::1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server ntp.nict.jp
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org
#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
#server 127.127.1.0 # local clock
#fudge 127.127.1.0 stratum 10
# Enable public key cryptography.
#crypto
includefile /etc/ntp/crypto/pw
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats
[root@ntp01 ~]#
[root@ntp01 ~]#
我有足够的时间同步，我们可以检查ntpq-p命令。
[root@ntp01 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*ntp-a3.nict.go. .NICT. 1 u 532 1024 377 20.644 -2.750 1.318
+103.6.16.254 10.84.87.146 2 u 530 1024 377 16.677 -0.464 14.068
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