Rudolph Bott wrote:
Hey List,
does the powerDNS recursor limit itself to a reasonable amount of cache
entries if you do *not* set the relevant parameter in recursor.conf? We
had a setup with a recursor which ate up the memory of the server pretty
fast (within a couple of days). As soon as it reached the limit of
physical memory, the machine started to swap heavily and was rendered
almost useless (the recurser stoped responding to almost all queries or
returned failures). Unfortunatly this happend quite a while ago and I
don't have the munin graphs at hand right now. We solved the problem by
uncommenting and setting this in recursor.conf:
#################################
# max-cache-entries If set, maximum number of entries in the main cache
#
max-cache-entries=500000
We are using the standard packages available on Debian etch (should be
version 3.1.4-1)
On top of that, i just noticed that apparently the recursor keeps more
than max-cache-entries in memory:
stats: 429816539 questions, 503914 cache entries, 24045 negative
entries, 66% cache hits
Mit freundlichen Grüßen / with kind regards
Rudolph Bott
Unfortunatly I kinda forgot to tell you what acutally bugged me about this
situation:
As expected, the memory usage on the server raised continously until the limit
of physically available memory was reached. At that point I would expect to see
the usage of swap raising with the same steadiness. But instead it just
explodes and seems to render the machine useless within just minutes (thats why
I mentioned including the munin graphs).
As soon as I can find the time to recreate the problem in a
non-production-environment, I will post my results to the list!
Mit freundlichen Grüßen / with kind regards
Rudolph Bott
--
Megabit Informationstechnik GmbH
Karstr.25 41068 Moenchengladbach Tel:02161/30898-0 Fax:-18
AG MG HRB 10141, GF: Dipl.-Ing. Thomas Tillig, Michael Benten
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