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doc: add new question to FAQ

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Miroslav Lichvar 2018-09-17 18:38:46 +02:00
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doc/faq.adoc
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@ -238,6 +238,29 @@ specified on the command line. For example:
# chronyd -q 'pool pool.ntp.org iburst'
----
=== Can `chronyd` be configured to control the clock like `ntpd`?
It is not possible to perfectly emulate `ntpd`, but there are some options that
can configure `chronyd` to behave more like `ntpd`.
In the following example the `minsamples` directive slows down the response to
changes in the frequency and offset of the clock. The `maxslewrate` and
`corrtimeratio` directives reduce the maximum frequency error due to an offset
correction and the `maxdrift` directive reduces the maximum assumed frequency
error of the clock. The `makestep` directive enables a step threshold and the
`maxchange` directive enables a panic threshold. The `maxclockerror` directive
increases the minimum dispersion rate.
----
minsamples 32
maxslewrate 500
corrtimeratio 100
maxdrift 500
makestep 0.128 -1
maxchange 1000 1 1
maxclockerror 15
----
=== What happened to the `commandkey` and `generatecommandkey` directives?
They were removed in version 2.2. Authentication is no longer supported in the