Authoritative DNS High Memory Usage

Tony Finch dot at dotat.at
Tue Jan 22 12:41:25 UTC 2019


Jordan Tinsley <jtinsley at lrecok.coop> wrote:
>
> DNS01 has extremely high memory usage while DNS02 has memory usage around
> 50% and fluctuates up and down.

I have seen some cases where reconfiguring the server (e.g.
adding/removing views) can cause it to reconstruct all its zone
configuration. Although the old zone data is freed, there is likely to be
enough heap fragmentation that the memory can't be given back to the OS,
so the memory usage effectively doubles. A restart fixes it.

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Faeroes, Southeast Iceland: Cyclonic 4 or 5,becoming northwesterly 5 to 7.
Rough or very rough, occasionally high at first. Wintry showers. Good,
occasionally poor.


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