On Thu, 2011-11-24 at 19:23 +0100, Miguel Tormo wrote: > The fd limit is the maximum number of concurrently open file descriptors per > process. It can be configured on a per-user basis. > You can check the actual value running 'ulimit -n'. It can be increased up to > the value set in /proc/sys/fs/file-max. You can set it editing > /etc/security/limits.conf.
I'm not sure if changing /etc/security/limits.conf helps. It's probably only used by PAM when user logs in, so if Dovecot is started in system bootup it's unlikely to have been even read yet. Also I think some OSes override the limits in /etc/init.d/ scripts. Of course, I could be completely wrong in all of the above, I haven't really tested any of it :) > What the above comment means is that under max load the auth service could > need up to 4096 file descriptors open, that's more than the default in most > linux systems (1024). I wonder if there's a good reason for why auth default should be that high. Probably in earlier times imap/pop3 processes just weren't disconnecting early enough from auth. So I guess I'll just drop it back to default and this warning would go away in most systems. I had started to get a little bit annoyed at that warning myself also.
