NTP configures time synchronization of cluster machines in private network

[huiyunltd@hadoop-senior ~] $rpm-qa | grep ntp [huiyunltd@hadoop-senior ~] $sudo vim / etc/ntp.confrestrict 192.168.0 mask 255.255.252.0 nomodify notrap#server 0.centos.pool.ntp.org#server 1.centos.pool.ntp.org#server 2.centos.pool.ntp.orgserver 127.127.1.0 # local clockfudge 127.127.1.0 stratum 10 [huiyunltd@hadoop-senior ~] $sudo vim / etc/sysconfig/ntpd # Drop root to id 'ntp:ntp' by default.SYNC_HWCLOCK=yesOPTIONS= "- 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 ntpdntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off [huiyunltd@hadoop-senior02 ~] $sudo crontab-e0-59 huiyunltd@hadoop-senior 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