ntp 最原始的时间服务器
yum install ntp ntpdate
systemctl enable ntpd && systemctl restart ntpd
# vi /etc/ntp.conf
server cn.pool.ntp.org prefer
restrict 192.168.1.1 mask 255.255.255.0 nomodify
server 127.127.1.0 # localclock
fudge 127.127.1.0 stratum 10
# restart service
systemctl enable ntpd && systemctl restart ntpd
# vi /etc/ntp.conf
server cn.pool.ntp.org prefer
# restart service
systemctl enable ntpd && systemctl restart ntpd
ntpq -p
#vi /etc/crontab
*/5 * * * * root ntpdate -s 192.168.1.1 ; hwclock -w
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