[Pdns-users] recursor problem

[Sergey Alexanov]

Florian Weimer ?????:
> * Sergey Alexanov:
> 
>> I've gotten an emergency shutdown of powerdns recursor running in
>> production.
>> There are only one record in logs about this incident:
>>
>> Sep 22 23:34:07 kit pdns_recursor[77218]: STL Exception: St9bad_alloc
> 
> This probably means that the recursor ran out of RAM.  Try lowering
> the limit on the number of records which are stored in the cache.
> 

Seems to me, there are one reason to take out of RAM: memory leak in new 
  version of powerdns recursor, of course if your guess right.
I've rolled back to 3.1.4 version and everything is ok.
Moreover, the cache size of recursor is restricted to 2 million records 
and memory usage in that particularly system is:

# vmstat
  procs      memory      page                    disks     faults      cpu
  r b w     avm    fre  flt  re  pi  po  fr  sr ad4 ad5   in   sy  cs us 
sy id
  2 1 0  639372 1479904   26   0   0   0  20   4   0   0  131   42  62 
23  2 75

# rec_control get cache-entries
1988201

# ps xawu | grep pdns_recursor | grep -v grep
bind   38083 15.0 12.8 434276 433796  ??  Ss   Mon03PM 1136:18.58 
/usr/local/sbin/pdns_recursor --config-dir=/usr/local/etc/powerdns