Detail linux ntp server time synchronization Settings

linux ntp server time synchronization Settings

Time synchronization is a requirement in many places. For example, installing cm and cdh requires ntp time synchronization, or a red warning will appear

This is mainly to set up a server as the primary server and let other machines synchronize the time of this machine. In addition, it is the configured local time and there is no synchronization of internet time, because most of the time the server cannot be connected to the Internet

First, we set up two machines here, the main machine is 192.168.5.102 and the other machine is 192.168.5.103

First set up the main machine

Edit /etc/ ntp.conf file

Add to it

restrict 127.0.0.1　　 #  Open the internal recursive network interface  lo 
restrict 192.168.5.0 mask 255.255.255.0 nomodify # Clients within the internal subnet can   Network proofreading, but can not be modified NTP Server time parameter  

Since the local time is configured, you also need to configure an NTP server that USES the system clock as the time source. The following records need to be added to the /etc/ ntp.conf file:

server 127.127.1.0 
fudge 127.127.1.0 stratun 10 

In the above records:

The specified IP address is a "fake" IP address that identifies the local system as the time source.

The specified IP address 127.127.1.1 tells NTP to use the internal clock as the time source.

"fudge" defines the level of this clock, without which the node is a level 1 server. It is a good idea to redefine the level to 10 so that clients can query the server knowing that it is not a reliable source of time

This method of time synchronization should only be used when the local network cannot use external time sources

Then start the NTP service

service ntpd start 

Set the boot to boot

chkconfig ntpd on 

Then configure the client to edit /etc/crontab file on the 192.168.5.103 host to set the synchronization time for this node per minute like the master server
The Settings are as follows:

* * * * * root /usr/sbin/ntpdate 192.168.5.102;/sbin/hwclock -w 

Above is the explanation of linux ntp server time synchronization Settings, thank you for reading, I hope to help you, thank you for your support to this site!