NTP服务器搭建
10.222.16.52 服务器端

10.222.16.5客户端
10.222.16.6客户端
10.222.16.7客户端

10.222.16.52服务器安装ntp、和ntpdate包，并编辑ntp.conf文件
Vi /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 nomodify notrap nopeer noquery

# 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