ntp测试小记

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测试环境

ntp server centos7.1

client xenserver6.5

目的xenserver到ntp server上同步时间

1.安装ntp

yum install ntp -y

2.编辑配置文件

vi /etc/ntp.conf

修改两处

添加允许连接同步的网段

restrict 192.168.0.0 mask 255.255.255.0 nomodify notrap

添加上层ntp server

server 2.cn.pool.ntp.org iburst
server 1.asia.pool.ntp.org iburst
server 3.asia.pool.ntp.org iburst

具体列表：http://www.pool.ntp.org/zone/cn

3.启动服务

systemctl start ntpd

systemctl enable ntpd

4.查看是否正常运行

[root@ntp ~]# ntpstat
synchronised to NTP server (202.162.32.12) at stratum 3
time correct to within 222 ms
polling server every 256 s

[root@ntp ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
202.118.1.130 .STEP. 16 u - 1024 0 0.000 0.000 0.000
*ntp.uii.net.id 10.84.87.146 2 u 219 256 377 146.161 19.764 31.889
+82.200.209.236 89.109.251.23 2 u 162 256 225 225.248 30.784 66.823

5.客户端设置

[root@xenserver02 ~]# crontab -l
*/1 * * * * /usr/sbin/ntpdate 192.168.0.109

具体频率根据自身需求设定

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