Servers time syncronization


We have two unix server, I'd like server A to sync with an outside time server, while server B sync to A. What are the possible approaches? How about:

1. run xntpd on both A and B; stop xntpd to run ntpdate outside_servername and then restart xntpd

2. run ntpdate on A, run rdate on B

What else?

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Run xntpd on both. Set up A to sync to an Internet time keeper and permit/configure B to sync to A.

   My personal experience for 2 unix servers, I perfer "2"
On A
# crontab -e
1 * * * * ntpdate <internet ntp server ip>

On B
# crontab -e
2 * * * * ntpdate A

   xntpd have some limitation such as time offset more than 18 minutes (?) will fail to sync the time.
Besides, xntpd might have some issues sometimes.


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I would go for option 2). and use cron to run ntpdate on A, run rdate on B.

Box A get time from an  NTP server.
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