Using memcached for authentication

[Willy Offermans]

Hello Cyrus-imap friends,

On Wed, Jul 09, 2014 at 12:05:02PM +0200, Willy Offermans wrote:
> Hello Ram and Cyrus-imap friends,
> 
> On Wed, Jul 09, 2014 at 03:06:16PM +0530, Ram wrote:
> > On 07/09/2014 02:49 PM, Willy Offermans wrote:
> > >Hello Ram and Cyrus-imap friends,
> > >
> > >
> > >On Wed, Jul 09, 2014 at 01:32:50PM +0530, Ram wrote:
> > >>Currently I use pam  with pam_mysql for authenticating cyrus accounts
> > >>But I frequently run into the issue of mysql connections exceeding limit.
> > >>
> > >>Can  I simply use something like Memcached or Redis to authenticate users
> > >>
> > >>
> > >>
> > >You could also simply increase the connections limit in MySQL.
> > I did .. I have now set it to unreasonable  limits.
> > But I think that is not a good idea anyway.
> > 
> > Most of these these webmail products they really jam the  imap
> > servers with too many authentication requests
> > I run cyrus-sasl with caching on  but still see too many connections
> > going to mysql servers  , when actually they are not needed at all
> > 
> > 
> > >I cannot
> > >get to my notes at the moment, but I'm pretty sure that you find the needed
> > >info somewhere on the net. duckduckgo is your friend as long as Google is
> > >tracking your interests.
> > >
> 
> If this is the case, then one should look to these authentication requests
> as well. If they are not necessary, then the amount of requests should be
> drastically decreased.
> 
> As a matter of fact, our imap-server also requests a lot of
> authentications. It will be about 200 times an hour per user. I noticed
> this before and I never understood why, but it also never led to an unworkable 
> situation. So I did not spent much time on it.
> 

I had another look to it and figured out that the amount of requests strongly
depends on the used e-mail client. In that case it is worth to investigate
the option imapproxyd in more detail, since the choice of e-mail client
cannot be dictated. 


-- 
Met vriendelijke groeten,
With kind regards,
Mit freundlichen Gruessen,
De jrus wah,

Wiel

*************************************
 W.K. Offermans

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