chrony is a pair of programs for maintaining the accuracy of computer clocks. chronyd is a background daemon program that can be started at boot time.

Assuming that you have found some servers, you need to set up a configuration file to run chrony. The (compiled-in) default location for this file is /etc/chrony/chrony.conf. Assuming that your ntp servers are called `a.b.c' and `d.e.f', your chrony.conf file could contain as a minimum

     server a.b.c
     server d.e.f
     server g.h.i

However, you will probably want to include some of the other directives described in detail in the documentation supplied with the distribution (chrony.txt and chrony.texi). The following directives may be particularly useful : `driftfile', `generatecommandkey', `keyfile', `makestep'. Also, the `iburst' server option is useful to speed up the initial synchronization. The smallest useful configuration file would look something like

     server a.b.c iburst
     server d.e.f iburst
     server g.h.i iburst
     keyfile /etc/chrony/chrony.keys
     driftfile /var/lib/chrony/drift
     makestep 10 3

RELATED TO chrony.conf…

chrony(1), chronyc(1), chronyd(8)


Richard Curnow <[email protected]>

This man-page was written by Jan Schaumann <[email protected]> as part of "The Missing Man Pages Project". Please see for details.

The complete chrony documentation is supplied in texinfo format.