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43 lines
2.1 KiB
Text
43 lines
2.1 KiB
Text
chrony is a versatile implementation of the Network Time Protocol (NTP). It
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can synchronise the system clock with NTP servers, reference clocks (e.g.
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GPS receiver), and manual input using wristwatch and keyboard. It can also
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operate as an NTPv4 (RFC 5905) server and peer to provide a time service to
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other computers in the network.
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It is designed to perform well in a wide range of conditions, including
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intermittent network connections, heavily congested networks, changing
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temperatures (ordinary computer clocks are sensitive to temperature), and
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systems that do not run continuously, or run on a virtual machine.
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Two programs are included in chrony, chronyd is a daemon that is started at
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boot time and chronyc is a command-line interface program which can be used
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to monitor chronyd's performance and to change various operating parameters
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whilst it is running.
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Note 1:
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You must have the 'chrony' group and user to run this script:
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$ groupadd -g 354 chrony
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$ useradd -u 354 -d /var/lib/chrony -s /bin/false -g chrony chrony
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Feel free to use a different uid and gid if desired, but 354 is recommended
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to avoid conflicts with other stuff from SlackBuilds.org.
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Note 2:
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If you are upgrading from previous version, where the daemon was running
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under 'root' user as opposed to 'chrony' user, you need to ensure correct
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permissions for /var/run/chrony directory and files under /var/lib/chrony
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directory.
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If possible (i.e. you don't have any precious files there), before starting
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the daemon, remove /var/run/chrony directory (cronyd will recreate it) and
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remove files under /var/lib/chrony directory (cronyd will recreate them).
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Note 3:
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The provided configuration file sets up chrony to operate in the most common
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scenario, that is NTP client for synchronising local machine time with the
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remote NTP server(s) time (using pool.ntp.org by default). See the man pages
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for chronyd and chrony.conf (and the contrib and examples directories) for
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more details on possible configuration options.
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Note 4:
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The provided /etc/rc.d/rc.chrony script can be used to launch the daemon at
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boot and to stop it at shutdown.
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