Configure NTP, synchronize server time, and configure ntp synchronization server

Source: Internet
Author: User
Tags net time

Configure NTP, synchronize server time, and configure ntp synchronization server

Configure NTP and synchronize server time

There are more and more servers in the project. Recently, Database Synchronization has been performed on several servers. When a synchronization error occurs, you can view the logs, as a result, we found a small problem that has been ignored-Time Inconsistency between several servers.

So I decided to use NTP (Network Time Protocol))--Is a protocol used to synchronize time between computers in the network. Its purpose is to synchronize the computer clock to the Coordinated Universal Time UTC, and its accuracy can reach 0.1 ms in the LAN. In most places on the Internet, its accuracy can reach 1-50 ms. To synchronize the time of several servers.

The idea is simple, that is, to make one of the servers into a time server, and then other servers can calibrate the time according to it. The following are the specific practices:

1. server settings:

By default, windows server 2008 works as an NTP client. Therefore, you must modify the Registry to run the system as an ntp server. Note: Before you work, back up the Registry file.


1. Enter the regedit command in the Start menu and open the registry settings screen. At this time, make sure to back up the Registry file.


2. Modify the key values of the following options

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ W32Time \ TimeProviders \

Enabled in NtpServer is set to 1 to enable the NTP server function.


3. Modify the following key values

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ W32Time \ Config \

AnnounceFlags is set to 5, which forces the host to declare itself as a reliable time source, using a built-in Complementary Metal Oxide Semiconductor (CMOS) clock.


4. Execute the following command on the doscommand line to ensure that the preceding modification takes effect.

Netstop w32time

Netstart w32time


It is recommended that you add the following configuration to avoid ntp synchronization between the server and the internet if the server is connected to the internet:

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ W32Time \ TimeProviders \

The enable value of NtpClient is set to 0 to prevent the client from automatically synchronizing external time services.



Ii. Customer settings:

1. Specify the master time server. Enter "net time/setsntp:" in DOS mode. Here we specify as the master time server or another address ( ).


2. freely set the time interval: (you can skip this step)

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ W32Time \ TimeProviders \

NtpClient's "SpecialPollInterval" is set to 604800 (or 86400) by default)



3. Configure Synchronization






Click Update now, and the pc will show that the synchronization is successful.


Copyright Disclaimer: This article is an original article by the blogger and cannot be reproduced without the permission of the blogger.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.