8884034104
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111 lines
3.9 KiB
Groff
111 lines
3.9 KiB
Groff
.TH CHRONYD 8 "August 10, 2001" chrony "System Administration"
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.SH NAME
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chronyd \- chrony background daemon
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.SH SYNOPSIS
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.B chronyd
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[\fIOPTIONS\fR]
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.SH DESCRIPTION
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\fIchrony\fR is a pair of programs for maintaining the accuracy of computer
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clocks. \fBchronyd\fR is a background daemon program that can be started at boot
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time.
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\fBchronyd\fR is a daemon which runs in background on the
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system. It obtains measurements (e.g. via the network) of the
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system's offset relative to other systems, and adjusts the system
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time accordingly. For isolated systems, the user can periodically
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enter the correct time by hand (using \fIchronyc\fR). In either case,
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\fBchronyd\fR determines the rate at which the computer
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gains or loses time, and compensates for this.
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.SH USAGE
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\fBchronyd\fR is usually started at boot-time and requires superuser
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priviliges.
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If \fBchronyd\fR has been installed to its default location
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\fI/usr/local/sbin/chronyd\fR, starting it is simply a matter of entering the
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command:
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\fI/usr/local/sbin/chronyd\fR
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Information messages and warnings will be logged to syslog.
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.SH OPTIONS
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A summary of the options supported by \fBchronyd\fR is included below.
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.TP
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.B \-d
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When run in this mode, the program will not detach itself from the
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terminal, and all messages will be sent to the terminal instead of
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to syslog.
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.TP
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\fB\-f\fR \fIconf-file\fR
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This option can be used to specify an alternate location for the
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configuration file (default \fI/etc/chrony.conf\fR).
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.TP
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.B \-r
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This option will reload sample histories for each of the servers being used.
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These histories are created by using the \fIdump\fR command in \fIchronyc\fR,
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or by setting the \fIdumponexit\fR directive in the configuration file. This
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option is useful if you want to stop and restart \fBchronyd\fR briefly for any
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reason, e.g. to install a new version. However, it only makes sense on
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systems where the kernel can maintain clock compensation whilst not under
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\fBchronyd\fR's control. The only version where this happens so far is Linux.
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On systems where this is not the case, e.g. Solaris and SunOS the option
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should not be used.
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.TP
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.B \-s
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This option will set the system clock from the computer's real-time
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clock. This is analogous to supplying the \fI-s\fR flag to the
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\fI/sbin/clock\fR program during the Linux boot sequence.
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Support for real-time clocks is limited at present - the criteria
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are described in the section on the \fIrtcfile\fR directive in the
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documentation supplied with the distribution.
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If \fBchronyd\fR cannot support the real time clock on your computer,
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this option cannot be used and a warning message will be logged to
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the syslog.
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If used in conjunction with the \fB-r\fR flag, \fBchronyd\fR will attempt
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to preserve the old samples after setting the system clock from
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the real time clock. This can be used to allow \fBchronyd\fR to
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perform long term averaging of the gain or loss rate across system
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reboots, and is useful for dial-up systems that are shut down when
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not in use. For this to work well, it relies on \fBchronyd\fR having
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been able to determine accurate statistics for the difference
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between the real time clock and system clock last time the
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computer was on.
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.TP
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.B \-v
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This option displays \fBchronyd\fR's version number to the terminal and exits
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.SH FILES
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\fI/etc/chrony.conf\fR
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.SH VERSION
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Version 1.17
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.SH BUGS
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To report bugs, please contact the author and/or visit \fIhttp://chrony.sunsite.dk/\fR
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.SH "SEE ALSO"
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\fBchronyd\fR is documented in detail in the documentation supplied with the
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distribution (\fIchrony.txt\fR and \fIchrony.texi\fR) and is also available
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from \fIhttp://go.to/chrony\fR
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.BR chrony(1),
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.BR chronyc(1),
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.BR chrony.conf(5),
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.BR clock(8),
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.BR xntpd(8),
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.BR ntpd(8)
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.SH AUTHOR
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Richard Curnow <rc@rc0.org.uk>
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This man-page was written by Jan Schaumann <jschauma@netmeister.org> as part
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of "The Missing Man Pages Project". Please see
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\fIhttp://www.netmeister.org/misc/m2p2/index.html\fR for details.
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