NTP time synchronization server mainly focuses on the NTP time synchronization function

Beidou time synchronization server mainly focuses on the Beidou satellite time source

GPS time server with the Beidou time synchronization server also focuses on the source of time is the GPS satellite.

At present, the time of network devices such as hosts and servers in a computer network is basically in an unorganized state. With the continuous emergence of computer network applications, computer time synchronization problems become more and more important things. Take the Unix system as an example, the accuracy of time affects almost all file operations. If a machine time is inaccurate, for example, from the time ahead of the machine to create a file, with ls view, to the current time minus the time of the file shown in the modification will be a negative value, this problem for the network file servers is a disaster, the reliability of the file will no longer exist. To avoid local errors, you can get time from the network, the command is rdate, so that the system clock can be synchronized with the public **** source. But an error in this public **** time source will have a domino effect, and the time of all machines synchronized with it will be wrong.

Additionally, synchronization is even more important when it comes to security devices on the network. The logs generated by these devices must reflect the exact time. Especially when dealing with busy data, it is almost impossible to correlate logs from different sources if the time is not synchronized. Once log files are not correlated, security correlation tools are useless. An unsynchronized network means that organizations have to spend a lot of time manually tracking security events. Now let's look at how you can synchronize your network and make security logs present accurate time.

The development of the Internet has made it possible to use e-money, online shopping, online securities, and financial transactions, which can be performed by customers sitting at home on their PCs. To ensure the normal conduct of these activities should have a uniform time. It is not conceivable that the user sends a sum of money at 3 o'clock and the bank receives it at 2:50. The clock of a personal computer has a very low accuracy of 10-4, 10-5, and it is possible to be off by more than ten seconds in a day.

Nowadays, many online teaching systems use time recording for many functions, such as recording time spent on the Internet, time spent submitting assignments, and time spent taking exams. Usually the user data recorded by the online teaching system is based on the web server time. I have previously appeared because the application server time is still 23:55, while the database server has crossed the 24:00, resulting in the entire batch being carried out or data archiving and other important batch processing failed or simply can not be carried out, in fact, the application and database server time is only a difference of a few minutes only. In order to avoid this situation, the system administrator should always pay attention to the server time, found that the time gap is large can be manually adjusted, but by the system administrator to manually adjust the inaccurate, and with the increase in the number of servers will be forgotten, so it is necessary to allow the system to automatically complete the synchronization of the time of multiple servers.

The solution to the above problem is the need for a clock jitter rate can be adjusted to establish an instant easing, adjusting time changes, and a group of trusted servers to provide accurate and stable time time management protocol, which is the Network Time Protocol (NTP). If your LAN can access the Internet, then do not have to install a dedicated NTP server, just install the NTP client software to the Internet's public **** NTP server to automatically correct the time can be, but so the time can be synchronized but not accurate may also be due to the network instability, thus leading to the result of time synchronization failures, the best solution is to install a network in their own NTP The best solution is to install an NTP server hardware device in the network to synchronize and unify the time of various computers, and the cost is not high even if it is high relative to the big data server, as a network engineer you know better.

Summary:

With the network scale, online applications continue to expand, the number of network devices and servers continue to increase. Network administrators often find that the time varies when viewing the logs of many network devices, and even if the time is set manually, there will be time errors due to time zones or daylight saving time and other factors; some Layer 2 switches reboot, the clock will be restored to the initial value, and you need to reset the time. For core network devices and important application servers, which sometimes need to work together, accurate and reliable time is especially important.

The configuration and use of NTP services are very simple and take up very little network information.NTP time servers are now widely used in areas such as network security, online teaching, and database backup. It is important for businesses to take steps to synchronize the time of their networks and devices, but ensuring that the logs generated by security devices provide accurate time deserves even more attention.