dovecot - Nov 2008 - Cache details

Hi All,

Is there any specific details we can extract from dovecots authentication
cache (besides Authentication cache hits)?
Reason i am asking is because we had a mysql user account which was
returning a unknown user account. Fixing the one value in the sql result
didnt have any affect and Dovecot was still returning an auth failure for
the user after 24 hours had elapsed, even though auth_cache_negative_ttl was
set to 120.

Restarting Dovecot or a SIGHUP on dovecot-auth sorted out the problem. It
would be useful if we could interrogate the cache somehow to see what cache
entry is been hit.

Auth cache settings are as follows:

auth_cache_size = 51200
auth_cache_ttl = 2100
auth_cache_negative_ttl = 120

Any suggestions appreciated.

Thanks,
Warren

On Tue, 2008-11-25 at 13:57 +0200, Warren Baker wrote:
> Hi All,
> 
> Is there any specific details we can extract from dovecots authentication
> cache (besides Authentication cache hits)?
> Reason i am asking is because we had a mysql user account which was
> returning a unknown user account. Fixing the one value in the sql result
> didnt have any affect and Dovecot was still returning an auth failure for
> the user after 24 hours had elapsed, even though auth_cache_negative_ttl
was
> set to 120.
> 
> Restarting Dovecot or a SIGHUP on dovecot-auth sorted out the problem. It
> would be useful if we could interrogate the cache somehow to see what cache
> entry is been hit.
auth_debug=yes would help debugging this. Seems to work correctly with
me:

dovecot: Nov 30 04:40:56 Info: auth(default): cache(test,127.0.0.1): hit: 
dovecot: Nov 30 04:40:56 Info: auth(default): cache(test,127.0.0.1): User
unknown
..
dovecot: Nov 30 04:41:11 Info: auth(default): cache(test,127.0.0.1): expired
dovecot: Nov 30 04:41:11 Info: auth-worker(default): sql(test,127.0.0.1): query:
select password from users where username = 'test'

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