ubuntu 下ntp sever 安装及配置

1. 安装
   sudo apt-get install ntp
2. 配置成和本机同步时间

# /etc/ntp.conf
driftfile /var/lib/ntp/ntp.drift 
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
#ntp server update with it self
server 127.127.1.0
fudge 127.127.1.0 stratum 5
#do not alow remote ipv4 and ipv6
restrict -4 default kod notrap nomodify nopeer noquery 
restrict -6 default kod notrap nomodify nopeer noquery
# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

3. 重启
   service ntp restart
4. 查看ntp服务器与上层ntp的状态
   ntpq -p