BIND 9's entropy consumption

Tony Finch dot at
Thu Apr 3 09:59:11 UTC 2014

Tom Limoncelli <tal at> wrote:
> I have 4 DNS servers all running BIND 9.8.2 (the CentOS 6.5 package).  One
> is configured as the master for about 100 zones.  The other 3 are slaves
> for those 100 zones.  On the master the amount of entropy reported by "cat
> /proc/sys/kernel/random/entropy_avail" was around 150.  On the slaves it
> hovered around 90.
> Is there a technical reason for the difference?

My guess is that the slaves need more random numbers because they are
making more queries, to check the SOAs of the zones.

f.anthony.n.finch  <dot at>
Rockall, Malin: Southeast 5 or 6, veering south 3 or 4. Moderate or rough.
Rain then showers. Moderate or poor, becoming good.

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