1.?关闭防火墙和selinux ? ? 客户端和server端都需要执行:
systemctl ?stop firewalld
systemctl ?disable firewalld
setenforce 0
编辑/etc/selinux/config
SELINUX=disabled
2. yum install ntp ntpdate -y
server/client都需要安装
3. server端编辑/etc/ntp.conf
?server 127.127.1.0 ER1 #127.127.1.0固定值,ER1是主机名
?local?
?clock?
?restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap?#192.168.1.0的网段
4. server端执行:
? ? systemctl start ntpd ? ? systemctl enable ntpd 5. server 端执行查看同步情况 ? ??ntpq -p
6. server端重启约5分钟后,客户端执行时钟同步 ? ??# ntpdate 192.168.1.11 ? ? 2 Mar 23:16:55 ntpdate[3850]: step time server 192.168.1.11 offset 302.482476 sec ? ? # ntpdate 192.168.1.11 ? ?2 Mar 23:17:19 ntpdate[3872]: adjust time server 192.168.1.11 offset -0.000017 sec
7.? 定时同步
crontab ?-e 00 01 * * * root ? /usr/sbin/ntpdate 192.168.1.11;/sbin/hwclock ?-w
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