Shulou(Shulou.com)06/02 Report--

Date command:

# date

Display system time

Hwclock command (that is, hardwareclock system hardware time)

# hwclock

Display hardware time

# hwclock-w

Write the system time to the system hardware

Ntpdate

Ntpdate is a linux time synchronization service software, specific details, please refer to Baidu, there are a lot of detailed information

Check to see if the ntpdate service is installed on this machine, and if not, yum install-y ntpdate

Synchronization time

Enter ntpdate time.nist.gov synchronization network time

Results: 3 Jun 15:42:39 ntpdate [4721]: adjust time server 211.115.194.21 offset-0.005885 sec

The above results indicate that the time synchronization is successful. The above roughly means that the adjustment time is the time of server 211.115.194.21, with a difference of-0.005885 seconds.

If the above time.nist.gov server cannot be synchronized, you can try the following time servers:

Time.nist.gov

Time.nuri.net

0.asia.pool.ntp.org

1.asia.pool.ntp.org

2.asia.pool.ntp.org

3.asia.pool.ntp.org

Adjust hardware time after synchronization time is successful

# hwclock-w

After the execution is successful, check the system hardware time (if nothing happens, the real time of both date and hwclock is internet time)

# date

# hwclock

When executing the above command, the display time should be the same

Time synchronization tasks are executed regularly, so we use crontab-e to add timing tasks

/ 1 ntpdate time.nuri.net;hwclock-w

That is: # synchronize the internet time every other hour and write to the hardware

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