When you configure multiple servers, often need to allow time between the individual servers in sync, if there is a server outside the network environment, you can update directly with the external time server time, you can use the command rdate Updated:
rdate -s tick.greyware.com
You can write a script to correct the time every hour in /etc/cron.hourly.
If it is an intranet environment, you can configure a time server yourself. Take CentOS as an example. The method for configuring the time server is as follows:
1. Install xinetd first: sudo yum install -y xinetd
2. Modify /etc/xinetd.d/time-stream, modify:
disable = yes to
disable = no
3. Start xinetd
service xinetd start
This way other machines can synchronize time with the machine via rdate
rdate -s ip
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