[ale] "Too many open files" while opening a socket on Ubuntu

[Greg Freemyer]

I hit a similar issue 7 or 8 years ago.

It was a limit in the J2EE stack somewhere.  It was just a config
variable to fix.

Greg

On 3/4/09, Kenneth Ratliff <lists at noctum.net> wrote:
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> On Mar 4, 2009, at 9:58 PM, JK wrote:
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>> I have a Java app that needs to open many many UDP sockets.  When
>> it's opened around 120 of them, further attempts fail with a
>> "Too many open files" exception.  It also starts a thread to handle
>> traffic on each of these sockets.  This error happens on Ubuntu 8.10,
>> but not on Fedora 8.
>>
>> ulimit -a says both max user processes and max open files = 65000
>> (because I changed them in /etc/security/limits.conf). I mention
>> user processes because I know Linux threads are implemented as
>> kernel-level processes, so I thought that might be relevant.
>>
>> Any ideas?  Google is leading me only to answers related to
>> ulimits.  It certainly seems to be a configuration issue with user
>> resource limits, but I don't see any obvious way to change (or
>> discover the values of) limits related to sockets.
>>
>> I'd really hate to have to go back to Fedora to solve this :-(
>
> Check any relevant scripts. I've seen a few cases of this where the
> script changed the ulimit parameters, which resulted in too many open
> files. Drove me bat<bleep> insane.
>
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Greg Freemyer
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