The method of using NTP to adjust system time when system time is out of order
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When we use the computer, we sometimes find that the time of the system is out of order. So how to make the system time accurate? Today, the editor will teach you a simple way to use NTP to adjust the system time.
NTP is the abbreviation of Network Time Protocol, which means "Network time Protocol". It is a time synchronization protocol implemented by TCP/IP protocol.
Ubuntu automatically goes to ntp.ubuntu.com to do time synchronization every time it starts. However, since the server generally does not start frequently, the time deviation cannot be avoided, and this deviation can be large. Therefore, we need to correct the server's time from time to time. The most convenient way is to synchronize time once a day with the help of cron's scheduled tasks.
Solution:
1. Create a file / etc/cron.daily/timeupdate:
_ FCKpd___0nbsp;sudo nano / etc/cron.daily/timeupdate
two。 Enter the following:
Ntpdate ntp.ubuntu.com
3. After you save the file, you also need to give it executable permissions:
_ FCKpd___2nbsp;sudo chmod 755 / etc/cron.daily/timeupdate
In this way, the system can go to ntp.ubuntu.com every day to get the time (all tasks in the / etc/cron.daily/ directory are executed once a day) and calibrate the time of the server itself. If you are worried about the failure of time acquisition, you can add multiple NTP servers to the / etc/cron.daily/timeupdate file:
Ntpdate ntp.ubuntu.com pool.ntp.org
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