Config large tuning and out of memory

Lightner, Jeff JLightner at
Tue Mar 3 18:10:26 UTC 2015

CentOS 5.x does have a 64 bit version.   5.2 is quite old - they're up to 5.10 or 5.11 these days.   I don't think you can just change from 32 bit to 64 bit - I think it requires a reinstall from the 64 bit installation media.  

 If you have do a reinstall you're better off going to at least CentOS 6 because RHEL5 (and therefore CentOS 5) should be nearing end of life.   Even better would be to go to CentOS 7 given it is the latest release so will have a much longer lifespan..

If you're running any other applications on the server you'd want to verify they don't have a problem running on a 64 bit OS before doing any upgrade.  Some applications are 32 bit only and may run fine on a 64 bit OS (you can usually install both 32 bit and 64 bit versions of most RPMs).    However, 32 bit applications may have reduced performance on a 64 bit OS.

If you do have to reinstall and choose to go to later release you'd of course want to be sure any applications will run on that later release.

-----Original Message-----
From: bind-users-bounces at [mailto:bind-users-bounces at] On Behalf Of Rich Goodson
Sent: Tuesday, March 03, 2015 11:44 AM
To: Job
Cc: bind-users at
Subject: Re: Config large tuning and out of memory


I won't go in to this in detail, as it's more complicated than "your 32 bit system can't address more than 4GB of RAM", but your 32 bit OS is almost certainly your problem.  Most of your 16GB of RAM is unused due to OS limitations.  

I'd recommend upgrading to a 64 bit OS, then compile a 64 bit version of BIND with your compile time options. 


> On Mar 3, 2015, at 10:05 AM, Job <Job at> wrote:
> Hello Rich,
> we are on 32 bit system, CentOS 5.2
> Thank you
> ________________________________________
> Da: Rich Goodson [rgoodson at]
> Inviato: martedì 3 marzo 2015 17.01
> A: Job
> Cc: bind-users at
> Oggetto: Re: Config large tuning and out of memory
> Is your binary 64 bit, or 32?
> Rich
>> On Mar 3, 2015, at 9:54 AM, Job <Job at> wrote:
>> Hello,
>> i recompiled Bind 9.10.1-P1 with system large tuning enabled.
>> I have some hundreds of view (with DLZ) in our system.
>> With this feature compiled in, bind does not start:
>> Mar  3 16:50:45 cloud02gw named[13338]: reloading configuration failed: out of memory
>> I have 16 Gb of RAM, and about 14 almost free!
>> Where is the matter?
>> Thank you
>> Francesco
>> _______________________________________________
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