CentOS sets system time and Network Time Synchronization

CentOS sets system time and Network Time Synchronization

Linux Time is divided into System Clock (System Time) and Real Time Clock (hardware Time, RTC ).

System time: the time in the current Linux Kernel.

Hardware time: the time when battery power is available on the motherboard.

Command for viewing system time: # date

Command for setting system time: # date-set (month/day/year hour: minute: second)

Example: # date-set "10/11/10"

Command for viewing hardware time: # hwclock

Command for setting hardware time: # hwclock-set-date = (month/day/year hour: minute: second)

As mentioned above, you can manually set the time to a time point, which may be different from the current network time. The following describes how to synchronize time with the time server.

1. Install the ntpdate Tool

# Yum-y install ntp ntpdate

2. Set system time and Network Time Synchronization

# Ntpdate cn.pool.ntp.org

3. Write the system time to the hardware time

# Hwclock -- systohc

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