bind 9.4 memory exhaustion

[Mark Andrews]

datasize

    The maximum amount of data memory the server may use. The default
    is default. This is a hard limit on server memory usage. If the
    server attempts to allocate memory in excess of this limit, the
    allocation will fail, which may in turn leave the server unable
    to perform DNS service. Therefore, this option is rarely useful
    as a way of limiting the amount of memory used by the server,
    but it can be used to raise an operating system data size limit
    that is too small by default. If you wish to limit the amount
    of memory used by the server, use the max-cache-size and
    recursive-clients options instead.

> 
> Greetings,
>  I'm running two nearly identically loaded internet viewable
> authoritative servers on bind 9.4.2. OS is BSD (recent).
> 
> I am running into problems with memory exhaustion on one of them.
> Yet no problems on the other.
> 
> The server with problem:
> SOA for 7 zones
> SLAVE for 7 zones
> 
> memory related conf lines:
>   datasize 15m;
> 	max-cache-size 45m;
> 
> The server without problem:
> SOA for 7 zones
> SLAVE for 9 zones
> 
> memory related conf lines:
>   datasize 5m;
> 	max-cache-size 10m;
> 
> 
> Furthermore the conf settings (other than data/cache lines) are identical
> on both.
> On the problem server I started with the lines:
>   datasize 5m;
> 	max-cache-size 10m;
> 
> but the following results were almost immediate:
> 
> # named.reload
> rndc: 'reload' failed: out of memory
> 
> # rndc reload
> rndc: 'reload' failed: out of memory
> 
> So I bumped the numbers up. Yet the higher numbers only postpones the
> inevitable:
> failed: out of memory.
> 
> I should also probably note that the "problem" server has 3 times the physica
> l
> memory installed/available, than does the other server.
> 
> Any thoughts, answers?
> 
> Thank you for all your time and consideration.
> 
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> 
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org