How to set time synchronization in linux

1. yum install ntp : install ntpdate.

2. ntpdate time.nist.gov: After installation, test it directly.

3. crontab -e: Enter into crontab.

4. Increase the command */10 * * * * ntpdate time.nist.gov: this means that it is executed every 10 minutes, if the time frequency does not want to be so high, you can adjust these *

5. * */1 * * * ntpdate time.nist.gov: Updated every hour.