On 10/1/2012 4:15 AM, FABIO FERRARI wrote:

Hello,

i have a problem with the process_limit configuration.

Occasionally, it happens that the dovecot.log shows this line: master: Warning: service(imap): process_limit reached, client connections are being dropped

So I checked, the process number, with the command: ps auxwww | grep imap | grep -v login | wc -l and it shows 1024.

Then, i edited the file /etc/dovecot/conf.d/10-master.conf and set the line process_limit = 1500

I checked if the dovecot had accepted the change with the command doveconf -n | grep process_limit and it shows process_limit = 1500

But it is dropping the connections when they reach 1024 anyway, the configuration parameter is totally ignored.

Can anyone help? Am I editing the right parameter?

thanks in advance

Fabio Ferrari

P.S. The version of the dovecot is dovecot-2.0.1-1_118.el5 on Red Hat Enterprise Linux Server release 5.8 (Tikanga).

Don't forget to change the operating system limit as well. I added these lines to my /etc/sysconfig/dovecot on rhel6. I compiled dovecot myself, but I package similar to the system version.

ulimit -n 4096 ulimit -u 5120

This increases the filehandles allowed by dovecot to 4096 and increases the number of processes per user to 5120. This is a proxy server, so I needed to support much larger numbers. than a silly 1024.

Jack