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Is there any way to tell how often Chrony is querying NTP servers?

If the answer is that it uses some algorithm based on how much the server has been out of sync in the past, is there some documentation on how that algorithm works?

Is there a way to set a minimum time frame for the query frequency?

Chris Williams
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2 Answers2

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To check how many seconds has passed since last sync:

$ chronyc sources

Look the column 'LastRx'

To set a minimum time frame to sync, use the 'minpoll' option in the /etc/chrony.conf file.

server 0.centos.pool.ntp.org minpoll 10
GreenTeaTech
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  • I believe you actually want `maxpoll`. `minpoll` is the *shortest* amount of time allowed between polls; whereas, `maxpoll` is the *longest* amount of time possible. You'd want a smaller `maxpoll` to check the servers more often. From https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/s1-Configure_NTP.html#s2_Configuring_the_Poll_Interval - "Setting a shorter maxpoll may improve clock accuracy." – abegosum Jul 18 '17 at 18:38
  • @abegosum any idea why a shorter maxpoll may improve the clock accuracy? – HCSF Jul 05 '19 at 00:58
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To set the minimum time frame in Chrony nano /etc/chrony.conf after your server add maxpoll poll This option specifies the maximum interval between requests sent to the server as a power of 2 in seconds.

Example: server 0.europe.pool.ntp.org maxpoll 8 This will force Chrony to sync every 256 seconds

Michał Moskal
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