Re: slapd: warning: cannot open /etc/hosts.allow: Too many open files

[Howard Chu <hyc@symas.com>]

Russ Allbery wrote:
> David<davidke@whidbey.net>  writes:
>
> > The reason for this error is you ran out of file descriptors for the
> > slapd process.  The default is 1024 for most systems.  To up it for just
> > slapd you can add:
>
> > ulimit -n XXX
>
> > Where XXX is the number of file descriptors you want to allow, I use
> > 8192.  Just add this line into the init script for slapd before you
> > start slapd and this should resolve your issue.
>
> Unless you're using i386 instead of amd64, at which point you'll still run
> into an upper limit on the select size.
>
> See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=378261 for more
> details.  (Advice on whether the solution that I outline there is
> supported and reasonable is welcome.)
There's no 32 bit vs 64 bit distinction here. The distinction is whether you 
built on a newer kernel/glibc that supports epoll() vs an older platform that 
only supports select(). If you're using epoll() then the FD_SETSIZE 
definitions are completely irrelevant, and the ulimit is the only controlling 
factor.
--
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP     http://www.openldap.org/project/