NTP lets you automatically sync your system time with a remote server.
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Set up the master server to connect to an outside NTP server, then have the other machines sync to the master.
This setup reduces the number of outgoing connections and guarantees that all of your machines have their time set to the same value.
Protect yourself against NTP server attacks by adding .
If you have more than one machine to sync, it is best to designate one as the master NTP server.This keeps your machine’s time accurate by syncing with servers that are known to have accurate times.NTP also keeps the clocks on several machines in sync, thus making it easier to match log entries for an event across multiple servers.To have the correct time and date in Linux is very important, a lot of things depends on it.It does not matter if you are using Linux to power your personal computer or you have a Linux server. Set date from the command line Set hardware clock The hardware clock is the clock that runs in you PC hardware even if you disconnect it from the main power supply.By using three or more servers, your clock will be more accurate than if it uses only one.