If you got a warning message from linode :
Your system’s clock is fast. Please ensure that ntp is installed and running.
How to solve the problem?
1. Change Time Zone (TZ)
$ sudo cp /usr/share/zoneinfo/Asia/Taipei /etc/localtime
$ sudo vim /etc/sysconfig/clock
change Etc/UTC to Asia/Taipei or yourself
2. Install NTP
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$sudo yum install ntp
$sudo service ntpd start
$sudo chkconfig ntpd on
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$ sudo vim /etc/ntp/step-tickers:
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0.pool.ntp.org
1.pool.ntp.org
2.pool.ntp.org
3.pool.ntp.org
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$ sudo service ntpd restart