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@@ -0,0 +1,155 @@ +This is the README for chrony. + +What is chrony? +=============== + +chrony is a versatile implementation of the Network Time Protocol (NTP). +It can synchronise the system clock with NTP servers, reference clocks +(e.g. GPS receiver), and manual input using wristwatch and keyboard. +It can also operate as an NTPv4 (RFC 5905) server and peer to provide +a time service to other computers in the network. + +It is designed to perform well in a wide range of conditions, including +intermittent network connections, heavily congested networks, changing +temperatures (ordinary computer clocks are sensitive to temperature), +and systems that do not run continuosly, or run on a virtual machine. + +Typical accuracy between two machines synchronised over the Internet is +within a few milliseconds; on a LAN, accuracy is typically in tens of +microseconds. With hardware timestamping, or a hardware reference clock, +sub-microsecond accuracy may be possible. + +Two programs are included in chrony, chronyd is a daemon that can be +started at boot time and chronyc is a command-line interface program +which can be used to monitor chronyd's performance and to change various +operating parameters whilst it is running. + +What will chrony run on? +======================== + +The software is known to work on Linux, FreeBSD, NetBSD, macOS and +Solaris. Closely related systems may work too. Any other system will +likely require a porting exercise. + +How do I set it up? +=================== + +The file INSTALL gives instructions. On supported systems the +compilation process should be automatic. You will need a C compiler, +e.g. gcc or clang. + +What documentation is there? +============================ + +The distribution includes manual pages and a document containing +Frequently Asked Questions (FAQ). + +The documentation is also available on the chrony web pages, accessible +through the URL + + https://chrony.tuxfamily.org/ + +Where are new versions announced? +================================= + +There is a low volume mailing list where new versions and other +important news relating to chrony are announced. You can join this list +by sending mail with the subject "subscribe" to + +chrony-announce-request@chrony.tuxfamily.org + +How can I get support for chrony? +================================= + +There are two other mailing lists relating to chrony. chrony-users is a +discussion list for users, e.g. for questions about chrony configuration +and bug reports. chrony-dev is a more technical list for developers, +e.g. for submitting patches and discussing how new features should be +implemented. To subscribe to either of these lists, send a message with +the subject "subscribe" to + +chrony-users-request@chrony.tuxfamily.org +or +chrony-dev-request@chrony.tuxfamily.org + +as applicable. + +License +======= + +chrony is distributed under the GNU General Public License version 2. + +Authors +======= + +Richard P. Curnow <rc@rc0.org.uk> +Miroslav Lichvar <mlichvar@redhat.com> + +Acknowledgements +================ + +In writing the chronyd program, extensive use has been made of the NTPv3 (RFC +1305) and NTPv4 (RFC 5905) specification. The source code of the xntpd/ntpd +implementation written by Dennis Fergusson, Lars Mathiesen, David Mills, and +others, has been used to check the details of the protocol. + +The following people have provided patches and other major contributions +to chrony: + +Lonnie Abelbeck <lonnie@abelbeck.com> +Benny Lyne Amorsen <benny@amorsen.dk> +Andrew Bishop <amb@gedanken.demon.co.uk> +Vincent Blut <vincent.debian@free.fr> +Stephan I. Boettcher <stephan@nevis1.columbia.edu> +David Bohman <debohman@gmail.com> +Goswin Brederlow <brederlo@informatik.uni-tuebingen.de> +Leigh Brown <leigh@solinno.co.uk> +Erik Bryer <ebryer@spots.ab.ca> +Jonathan Cameron <jic23@cam.ac.uk> +Bryan Christianson <bryan@whatroute.net> +Juliusz Chroboczek <jch@pps.jussieu.fr> +Christian Ehrhardt <christian.ehrhardt@canonical.com> +Paul Elliott <pelliott@io.com> +Robert Fairley <rfairley@redhat.com> +Stefan R. Filipek <srfilipek@gmail.com> +Mike Fleetwood <mike@rockover.demon.co.uk> +Alexander Gretencord <arutha@gmx.de> +Andrew Griffiths <agriffit@redhat.com> +Walter Haidinger <walter.haidinger@gmx.at> +Juergen Hannken-Illjes <hannken@eis.cs.tu-bs.de> +John Hasler <john@dhh.gt.org> +Tjalling Hattink <t.hattink@fugro.nl> +Liam Hatton <me@liamhatton.com> +Jachym Holecek <jakym@volny.cz> +Håkan Johansson <f96hajo@chalmers.se> +Jim Knoble <jmknoble@pobox.com> +Antti Jrvinen <costello@iki.fi> +Eric Lammerts <eric@lammerts.org> +Stefan Lucke <stefan@lucke.in-berlin.de> +Victor Lum <viclum@vanu.com> +Kevin Lyda <kevin@ie.suberic.net> +Paul Menzel <paulepanter@users.sourceforge.net> +Vladimir Michl <vladimir.michl@seznam.cz> +Victor Moroz <vim@prv.adlum.ru> +Kalle Olavi Niemitalo <tosi@stekt.oulu.fi> +Frank Otto <sandwichmacher@web.de> +Denny Page <dennypage@me.com> +Chris Perl <cperl@janestreet.com> +Gautier PHILIPPON <gautier.philippon@ensimag.grenoble-inp.fr> +Andreas Piesk <apiesk@virbus.de> +Andreas Steinmetz <ast@domdv.de> +NAKAMURA Takumi <takumi@ps.sakura.ne.jp> +Timo Teras <timo.teras@iki.fi> +Bill Unruh <unruh@physics.ubc.ca> +Stephen Wadeley <swadeley@redhat.com> +Bernhard Weiss <lisnablagh@web.de> +Wolfgang Weisselberg <weissel@netcologne.de> +Bernhard M. Wiedemann <bwiedemann@suse.de> +Joachim Wiedorn <ad_debian@joonet.de> +Ralf Wildenhues <Ralf.Wildenhues@gmx.de> +Ulrich Windl <ulrich.windl@rz.uni-regensburg.de> +Doug Woodward <dougw@whistler.com> +Thomas Zajic <zlatko@zlatko.fdns.net> + +Many other people have contributed bug reports and suggestions. We are sorry +we cannot identify all of you individually. |