Linux operating systems are becoming increasingly popular, partly because of the many advantages they have over commercial systems such as Windows or OS X. Linux provides increased security (because only a handful of viruses that infect a Linux-based system), better stability and most cases it's free.
It's no wonder more and more home and business users choose to switch a Linux-based operating systems, and whether they RedHat, Mandrake, Ubuntu, or the countless otherUNIX and Linux-based systems to keep accurate time is relatively simple.
Time synchronization is vital in many time-sensitive applications, and most business users would find it impossible to conduct all online transactions a synchronized network. Even home users can find an advantage in securing their systems running the exact time to get e-mails no longer before they are sent, and the security is increased.
Most Linux-based operating systems include a version ofNetwork Time Protocol (NTP), an Internet protocol designed to synchronize time on a network. For those who do not already contain non-packaged version, NTP is open source and freely available "ntp.org.
While NTP is available for most Windows versions available; Linux users have the advantage that it is now the primary development platform for NTP. It operates with a timing source from either the Internet or via a dedicated network time server.
This radio controlled clock runningTime (Coordinated Universal Time), a global time scale that is forwarded to them from atomic clocks, accurate to a few nanoseconds (one nanosecond) is a billionth of a second.
Simply put, the NTP daemon (a service program that runs in the background) compares the time on the computer with the timing source at regular intervals and puts them in depending on any drift.
The NTP daemon is the "ntp.conf" file. The configuration file is where the situation ofTiming NTP servers are stored. If you try to use a public Internet timing source is recommended to visit the http://www.pool.ntp.org use a collection of over 200 servers.
Microsoft and Novell, however, strongly recommend that the internet based timing sources are not used because they are not authenticated and can open a door for malicious attacks leave.
Alternatively, and most preferably, are dedicated NTP servers are available that offer higher accuracy and are much safer. TheseTime servers receive a timing source, either from a national broadcast (such as WWVB in the U.S. or Doctors Without Borders in the UK) or via the GPS system.
After the installation of these systems constantly check the time on all clocks in the network of computers and adapt them for any drift. A typical GPS receivers timing information to within a few nanoseconds of the clock, while the national time and frequency broadcasts are correct to 1 - 20 milliseconds (a millisecond is) 1 / 1000 of a second.
0 ความคิดเห็น:
แสดงความคิดเห็น