If you want to synchronize the system clock in your CentOS Linux box, you can install and configure NTP (Network Time Protocol, a means of transmitting time signals over a computer network).
step 1: install ntp
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# yum install ntp |
step 2: Turn on NTP service
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# chkconfig ntpd on |
step 3: Synchronize the system clock with 0.pool.ntp.org server
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# ntpdate pool.ntp.org |
step 4: Start the NTP service
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# /etc/init.d/ntpd start |