[lvs-users] DNS LVS questions

Pete Ashdown pashdown at xmission.com
Tue Sep 25 19:48:16 BST 2012

On 09/25/2012 12:29 PM, Kelsey Cummings wrote:
> On Tue, Sep 25, 2012 at 08:42:10AM -0600, Pete Ashdown wrote:
>> On 09/25/2012 02:42 AM, Graeme Fowler wrote:
>>> On Sun, 2012-09-23 at 02:51 -0600, Pete Ashdown wrote:
>>>> Thanks for the localhost addressing tip.  I've got my lvs dns in production
>>>> now and it is cranking along.  I had to lower the udp timeout to 1 second
>>>> from my predicted 15 because the latter was crashing the server with OOM.  
>>> Really? How many queries/sec is your system handling?
>> 1000-2000 qps.
> ...
>> 8GB of RAM.
> Something isn't right there - I'm pushing >4k qps per lvs box in our dns
> clusters on hosts with 2GB, with 1.5G in cache.  Keepalived?

With the timeout at 1 second, I'm using less than 1.5GB RAM.  It only OOMs
on higher timeouts, like 15 seconds.

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