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ntp: limit number of pool sources

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A new option can be now used in the pool directive: maxsources sets the
maximum number of sources that can be used from the pool, the default
value is 4.

On start, when the pool name is resolved, chronyd will add up to 16
sources, one for each resolved address. When the number of sources from
which at least one valid reply was received reaches maxsources, the
other sources will be removed.
This commit is contained in:
Miroslav Lichvar
2014-11-26 16:40:33 +01:00
parent f2c80cae44
commit 308bcae257
7 changed files with 93 additions and 10 deletions
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21
chrony.texi.in
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@@ -2492,21 +2492,28 @@ pidfile /var/tmp/chronyd.pid
@c {{{ pool
@node pool directive
@subsection pool
The syntax of this directive is identical to that for the @code{server}
The syntax of this directive is similar to that for the @code{server}
directive (@pxref{server directive}), except that it is used to specify a pool
of NTP servers rather than a single NTP server. The pool name is expected to
resolve to multiple addresses which change over time.
resolve to multiple addresses which may change over time.
On start, a source will be added for each resolved address. When a source from
the pool is unreachable or marked as falseticker, @code{chronyd} will try to
replace the source with a newly resolved address of the pool.
All options valid in the @code{server} directive can be used in this directive
too. There is one option specific to @code{pool} directive: @code{maxsources}
sets the maximum number of sources that can be used from the pool, the default
value is 4.
On start, when the pool name is resolved, @code{chronyd} will add up to 16
sources, one for each resolved address. When the number of sources from which
at least one valid reply was received reaches @code{maxsources}, the other
sources will be removed. When a pool source is unreachable or marked as
falseticker, @code{chronyd} will try to replace the source with a newly
resolved address of the pool.
An example of the pool directive is
@example
pool pool.ntp.org iburst
pool pool.ntp.org iburst maxsources 3
@end example
@c }}}
@c {{{ port
@node port directive