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chrony.conf(5) [centos man page]

chrony.conf(5)							Configuration Files						    chrony.conf(5)

NAME
chrony.conf - chronyd configuration file SYNOPSIS
/etc/chrony.conf DESCRIPTION
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.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 distri- bution (chrony.txt and chrony.texi). The following directives will be particularly useful : `driftfile', `commandkey', `keyfile'. The smallest useful configuration file would look something like server a.b.c server d.e.f server g.h.i keyfile /etc/chrony.keys commandkey 1 driftfile /var/lib/chrony/drift SEE ALSO
chrony(1), chronyc(1), chronyd(8) http://chrony.tuxfamily.org/ AUTHOR
Richard Curnow <rc@rc0.org.uk> This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing Man Pages Project". Please see http://www.netmeister.org/misc/m2p2/index.html for details. The complete chrony documentation is supplied in texinfo format. chrony 1.29.1 January 2014 chrony.conf(5)

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CHRONY(1)							   User's Manual							 CHRONY(1)

NAME
chrony - programs for keeping computer clocks accurate SYNOPSIS
chronyc [OPTIONS] chronyd [OPTIONS] DESCRIPTION
chrony is a pair of programs for keeping computer clocks accurate. chronyd is a background (daemon) program and chronyc is a command-line interface to it. Time reference sources for chronyd can be RFC1305 NTP servers, human (via keyboard and chronyc), or the computer's real- time clock at boot time (Linux only). chronyd can determine the rate at which the computer gains or loses time and compensate for it while no external reference is present. Its use of NTP servers can be switched on and off (through chronyc) to support computers with dial- up/intermittent access to the Internet, and it can also act as an RFC1305-compatible NTP server. USAGE
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. chronyd's main function is to obtain measurements of the true (UTC) time from one of several sources, and correct the system clock accord- ingly. It also works out the rate at which the system clock gains or loses time and uses this information to keep it accurate between mea- surements from the reference. The reference time can be derived from either Network Time Protocol (NTP) servers, reference clocks, or wristwatch-and-keyboard (via chronyc). The main source of information about the Network Time Protocol is http://www.ntp.org. It is designed so that it can work on computers which only have intermittent access to reference sources, for example computers which use a dial-up account to access the Internet or laptops. Of course, it will work well on computers with permanent connections too. In addition, on Linux it can monitor the system's real time clock performance, so the system can maintain accurate time even across reboots. Typical accuracies available between 2 machines are On an ethernet LAN : 100-200 microseconds, often much better On a V32bis dial-up modem connection : 10's of milliseconds (from one session to the next) With a good reference clock the accuracy can reach one microsecond. chronyd can also operate as an RFC1305-compatible NTP server and peer. SEE ALSO
chronyc(1), chrony(1) http://chrony.tuxfamily.org/ AUTHOR
Richard Curnow <rc@rc0.org.uk> This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part of "The Missing Man Pages Project". Please see http://www.netmeister.org/misc/m2p2/index.html for details. The complete chrony documentation is supplied in texinfo format. chrony @VERSION@ @MAN_DATE@ CHRONY(1)
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