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doc: update initstepslew description

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Miroslav Lichvar 2014-06-30 17:19:40 +02:00
parent 698404b02f
commit d26bb9b4eb
1 changed files with 11 additions and 3 deletions
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14
chrony.texi.in
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@ -1688,7 +1688,7 @@ include @SYSCONFDIR@/chrony/local.conf
@c {{{ initstepslew
@node initstepslew directive
@subsection initstepslew
In normal operation, @code{chronyd} always slews the time when it needs to
In normal operation, @code{chronyd} slews the time when it needs to
adjust the system clock. For example, to correct a system clock which
is 1 second slow, @code{chronyd} slightly increases the amount by which the
system clock is advanced on each clock interrupt, until the error is
@ -1720,8 +1720,7 @@ servers as arguments. A maximum of 8 will be used. Each of the servers
is rapidly polled several times, and a majority voting mechanism used to
find the most likely range of system clock error that is present. A
step (or slew) is applied to the system clock to correct this error.
@code{chronyd} then enters its normal operating mode (where only slews are
used).
@code{chronyd} then enters its normal operating mode.
An example of use of the command is
@ -1742,6 +1741,15 @@ below), the master can be set up with an @code{initstepslew} directive
which references some or all of the slaves. Then, if the master machine
has to be rebooted, the slaves can be relied on to 'flywheel' the time
for the master.
The @code{initstepslew} directive is functionally similar to a
combination of the @code{makestep} and @code{server} directives with
the @code{iburst} option. The main difference is that the
@code{initstepslew} servers are used only before normal operation
begins and that the foreground @code{chronyd} process waits for
@code{initstepslew} to finish before exiting. This is useful to
prevent programs started in the boot sequence after @code{chronyd}
from reading the clock before it's stepped.
@c }}}
@c {{{ keyfile
@node keyfile directive