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

[Kenneth Ratliff]

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On Mar 4, 2009, at 9:58 PM, JK wrote:

> 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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