This document describes setup of chrony on a Redhat system (the specific configuration chosen for this setup). The user should read the documentation in /usr/doc/chrony (especially the info files) for specific information about chrony. The configuration file is in /etc/chrony.conf and looks like: server x.x.x.x offline keyfile /etc/chrony.keys commandkey 1 driftfile /etc/chrony.drift logdir /var/log/chrony log statistics measurements tracking rtc rtcfile /etc/chrony.rtc rtconutc You should replace the "x.x.x.x" with your NTP server and add new NTP servers to this file as necessary. Remove the "offline" parameter if you are on a direct connection (not a dialin). If you are dialing in, see below for more info. The password in the keyfile is currently "test1". You should probably change this. The last line assumes your clock is on UTC time. Remove it if you use local time. If you are dialing in, you must adjust your startup files to handles this. I use PPP, so that is all I know about. If you use PPP, add the following to your /etc/ppp/ip-up.local, changing the password to what you have chosen: cat <<EOF | /usr/bin/chronyc password test1 online EOF and add the following to your /etc/ppp/ip-down.local: cat <<EOF | /usr/bin/chronyc password test1 offline writertc EOF Corey Minyard <minyard@acm.org>