[huiyunltd@hadoop-senior ~]$ rpm -qa|grep ntp
[huiyunltd@hadoop-senior ~]$ sudo vim /etc/ntp.conf
restrict 192.168.8.0 mask 255.255.252.0 nomodify notrap
#server 0.centos.pool.ntp.org
#server 1.centos.pool.ntp.org
#server 2.centos.pool.ntp.org
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
[huiyunltd@hadoop-senior ~]$ sudo vim /etc/sysconfig/ntpd
# Drop root to id 'ntp:ntp' by default.
SYNC_HWCLOCK=yes
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -g"
[huiyunltd@hadoop-senior ~]$ sudo service ntpd start
[huiyunltd@hadoop-senior ~]$ sudo service ntpd status
[huiyunltd@hadoop-senior ~]$ sudo service ntpd status
[huiyunltd@hadoop-senior ~]$ sudo chkconfig ntpd on
[huiyunltd@hadoop-senior ~]$ sudo chkconfig --list|grep ntpd
ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[huiyunltd@hadoop-senior02 ~]$ sudo crontab -e
0-59/10 * * * * /usr/sbin/ntpdate hadoop-senior.huiyunltd.com
[huiyunltd@hadoop-senior ~]$ sudo date -s 2017-06-23
[huiyunltd@hadoop-senior ~]$ sudo date -s 13:02:10
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