Using memcached for authentication

Willy Offermans Willy at
Wed Jul 9 06:05:02 EDT 2014

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.

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


 W.K. Offermans

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