[Dovecot] Server settings for a busy server

[Timo Sirainen]

On Sat, 2006-05-27 at 13:29 +0100, Pat Hastings wrote:
> Hi,
> 
> We are migrating from a windows server and i have very few stats as to
> what our current concurrent usage stats are other than about 50,000
> active users and 90,000 email messages a day inbound 20,000 outbound.
> 
> Anyone got some tips for tuning dovecot to handle this load?
> 
> Below is my config - do the values of login_process_size etc sound
> correct? 

I guess they're good enough.

> Also my logs seem to be written out as root which seems kind of scary do
> how do I / should I have these written out by the dovecot user.

All logging currently goes through Dovecot's master process. This
shouldn't be a problem. In Dovecot 2.0 I plan to have separate logger
processes and make logging through them. Then they wouldn't necessarily
have to run as root.

> mail_extra_groups = mail

This probably isn't needed unless you have a good reason to use it.

> auth_executable = /usr/lib/dovecot/dovecot-auth
> auth_verbose = yes
> auth_debug = yes
> auth_debug_passwords = yes
> auth default {
>   mechanisms = plain
>   passdb pam {
>   }
>   passdb ldap {
>     args = /etc/dovecot/dovecot-ldap.conf
>   }
>   userdb passwd {
>   }
>   userdb ldap {
>     args = /etc/dovecot/dovecot-ldap.conf
>   }
>   user = root
> }

You could try auth_cache settings to see if they reduce the load even
more. And if you want to cache PAM lookups also then you'd need to set
cache_key parameter for it.

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