ntp配置本地服务器 ntp.conf

基本的配置文件
想配置本地时间服务器server 127.127.1.0 必须这样写

# --- GENERAL CONFIGURATION ---
server  aaa.bbb.ccc.ddd
server  127.127.1.0
fudge   127.127.1.0 stratum 10

# Drift file.

driftfile /etc/ntp/drift

我的例子
restrict 192.168.0.0 mask 255.255.255.0 nomodify
允许192.168.0.0 网段访问

# 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 nomodify

# 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 default ignore
restrict 192.168.0.0  mask 255.255.255.0 nomodify 


# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
server  127.127.1.0
fudge   127.127.1.0 stratum 10


#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

# 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

# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor

ntp -q
查看状态

当reach达到5时就可以正常工作了

客户端操作写到定时脚本里

sudo vi /etc/crontab
*/30 * * * * /usr/sbin/ntpdate 192.168.233.141