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Add a note that three servers is the generally recommended minimum for an NTP client to be able to detect a falseticker. Mention that the pool directive uses four servers. Update the links to the pool join page and list of public servers.
53 lines
1.5 KiB
Plaintext
53 lines
1.5 KiB
Plaintext
# Note: The general recommendation for an NTP client is to have at least
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# three NTP servers to be able to detect one server providing incorrect
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# time (falseticker).
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# Use four public NTP servers from the pool.ntp.org project. If this
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# host has a static public IP address, please consider joining the pool:
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# https://www.ntppool.org/join.html
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pool pool.ntp.org iburst
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# Record the rate at which the system clock gains/losses time.
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driftfile /var/lib/chrony/drift
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# Allow the system clock to be stepped in the first three updates
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# if its offset is larger than 1 second.
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makestep 1.0 3
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# Enable kernel synchronization of the real-time clock (RTC).
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rtcsync
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# Enable hardware timestamping on all interfaces that support it.
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#hwtimestamp *
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# Increase the minimum number of selectable sources required to adjust
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# the system clock.
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#minsources 2
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# Allow NTP client access from local network.
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#allow 192.168.0.0/16
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# Serve time even if not synchronized to a time source.
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#local stratum 10
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# Require authentication (nts or key option) for all NTP sources.
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#authselectmode require
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# Specify file containing keys for NTP authentication.
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#keyfile /etc/chrony.keys
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# Save NTS keys and cookies.
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ntsdumpdir /var/lib/chrony
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# Insert/delete leap seconds by slewing instead of stepping.
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#leapsecmode slew
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# Set the TAI-UTC offset of the system clock.
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#leapseclist /usr/share/zoneinfo/leap-seconds.list
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# Specify directory for log files.
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logdir /var/log/chrony
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# Select which information is logged.
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#log measurements statistics tracking
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