[Dovecot] too many files opened

[Timo Sirainen]

On Wed, 2007-08-29 at 10:06 +0800, Joshua, C.S. Chen wrote:
> Hi folks,
> My institute's mail server was upgraded to RHEL5 with dovecot 1.0-2.1rc5
> recently. And it uses PAM authentication which points to LDAP server.
> Now from time to time it gets Error like

rc5 is pretty old. There are v1.0.x packages for RHEL5.

> dovecot: Aug 29 09:23:59 Error: auth(default):
> pam(joshua,192.168.177.52): pipe() failed: Too many open files

Look at dovecot-auth process's list of open files:

ls -l /proc/`pidof dovecot-auth`/fd/

How many are there and what are opened most of the time?

> auth default:
> passdb:
> driver: pam
> userdb:
> driver: passwd

Are you using also nss_ldap? See
http://wiki.dovecot.org/AuthDatabase/Passwd. With rc5 you can't fix it
properly, and that could also be the cause of your problems.

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