Chronyd configuration file
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 generatecommandkey driftfile /var/lib/chrony/drift makestep 10 3