Timo Veith wrote:
Hi list readers,
I have a problem with our imap server. My users complain about timeouts
when connecting to the server. We have nagios checking the status of the
imap port. Most of the time it reports success and response times of less
than one second. But sometimes the response takes longer than 10 seconds
and then nagios reports a timeout.
I don't think that the machine is overloaded, it's a dual xeon 2,8 ghz
with 4 gb of ram and a gigabit link.
I am running Gentoo Linux with gentoo-sources as kernel (version 2.6.18),
cyrus-imapd-2.2.12-r4 (autocreate patch applied). I have no iptables
rules activated.
Because nagios just connects and disconnects right away, I don't think
that the problem has something to do with authentication. However I am
using saslauthd -> pam -> pam_ldap -> Active Directory.
How can I find out what cyrus is doing right at the time when those
timeouts happen or where the thing is hanging?
Some time ago we had some problems with sasl. When to many users are
connecting sasl starts blocking because it hasn't enough entropy.
Recompile sasl so it uses /dev/urandom instead of /dev/random.
Rudy
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Rudy Gevaert Rudy.Gevaert@xxxxxxxx tel:+32 9 264 4734
Directie ICT, afd. Infrastructuur Direction ICT, Infrastructure dept.
Groep Systemen Systems group
Universiteit Gent Ghent University
Krijgslaan 281, gebouw S9, 9000 Gent, Belgie www.UGent.be
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