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45 lines
2.1 KiB
Text
45 lines
2.1 KiB
Text
chrony is a versatile implementation of the Network Time Protocol
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(NTP). It can synchronise the system clock with NTP servers, reference
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clocks (e.g. GPS receiver), and manual input using wristwatch and
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keyboard. It can also operate as an NTPv4 (RFC 5905) server and peer
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to provide a time service to 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),
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and 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
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started at boot time and chronyc is a command-line interface program
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which can be used to monitor chronyd's performance and to change
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various operating parameters 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
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recommended 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
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running under 'root' user as opposed to 'chrony' user, you need to
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ensure correct permissions for /var/run/chrony directory and files
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under /var/lib/chrony directory.
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If possible (i.e. you don't have any precious files there), before
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starting the daemon, remove /var/run/chrony directory (cronyd will
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recreate it) and remove files under /var/lib/chrony directory (cronyd
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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
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common scenario, that is NTP client for synchronising local machine
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time with the remote NTP server(s) time (using pool.ntp.org by
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default). See the man pages for chronyd and chrony.conf (and the
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contrib and examples directories) for more details on possible
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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
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daemon at boot and to stop it at shutdown.
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