[Dovecot] Inotify max_user_instances

Daniel L. Miller dmiller at amfes.com
Fri Mar 8 14:21:54 EET 2013

On 3/8/2013 12:31 AM, Steffen Kaiser wrote:
> see
> http://stackoverflow.com/questions/11110245/inotify-fd-why-is-the-limit-per-user-id-and-not-per-process 
> Dovecot needs one inotify entity per IDLE, maybe more for internal 
> purposes. So in theory, you will need: <max number of simultaneous 
> users> * <number of watched mailboxes per users> + <fixed amount>, 
> because you use one _system_ user for all IMAP-users.

Thanks.  I actually had this increased previously - but for whatever 
reason my sysctl.d/60-inotify.conf didn't get applied last reboot.

>> I'm also fighting a netfilter issue - my connection tracking counters 
>> keep climbing.  Don't know if this is in any way related.
> Do you use NAT on the same machine? Or some intrusion detection 
> system? When you get many short connections, esp. UDP ones, the 
> connection tracker fills up easily.

Yes and Yes.  Could fail2ban be hurting more than it's helping?


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