Re: proxy-cache

[Howard Chu <hyc@symas.com>]

Remco Post wrote:

> Hi all,
>
> so after having stepped on enough toes for one day, now a true 
> openldap question.
>
> I have compiled openldap-2.2.17 and configured it. The sql database is 
> the same I've been using for some time now. So I don't expect any 
> problems in that part. Now, I've tried to add a proxy-cache to help 
> speed things up a bit (10 entries/sec is a bit to slow). I have the 
> following rules in my slapd.conf:
>
> --8<--
> # the real thing
> #
> database sql
> suffix          "o=sara,c=NL"
> rootdn          "cn=root,o=sara,c=NL"
> rootpw          zeergeheim123
> dbname          PgSQL
> dbuser          ldap
> dbpasswd        ldap
> upper_func      "upper"
> strcast_func    "text"
> concat_pattern  "?||?"
> has_ldapinfo_dn_ru no
> # subtree_cond
> # oc_query
> # at_query
> # insentry_query
> # delentry_query
> #
> # a proxy cache for our database
> #
> database        meta
> rewriteEngine on
> rewriteContext cacheResult
> rewriteRule "(.*)dc=sara,dc=NL" "%1o=sara,c=NL" ":"
> rewriteContext cacheBase
> rewriteRule "(.*)dc=sara,dc=NL" "%1o=sara,c=NL" ":"
> rewriteContext cacheReturn
> rewriteRule "(.*)o=sara,c=NL" "%1dc=sara,dc=NL" ":"
>
> suffix  "dc=sara,dc=NL"
> uri     "ldap://dromedaris.sara.nl/o=sara,c=NL";
>
>
> overlay proxycache
>         proxycache ldbm 100000 1 1000 100
>         proxyAttrset  0 uid uidNumber objectClass
>         proxyTemplate (uid=?) 0 3600
>         proxyTemplate (objectClass=?) 0 3600
>         proxyTemplate (uidNumber=?) 0 3600
>         directory /usr/local/etc/openldap/db
> --8<--
>
> statring the slapd using `./slapd -h 'ldap:/// ldaps:///' -d 1` to see 
> what is going on yield a lot of lines printing '
> backend_startup: starting "dc=sara,dc=NL"' ginving me the impression 
> that something is looping.
>
> I've tries setting the uri rule for my meta-db to 
> "ldap://dromedaris.sara.nl/dc=sara,dc=NL"; as is done in the sample 
> code, but that has the same result.
>
> any hints on the use of the proxycache would be appreciated, nieter 
> the IBM whitepaper nor the on-line documentation give me any hints on 
> what is going wrong....
The proxy cache is no longer part of back-meta. There is no reason to 
include any references to the meta backend in your slapd.conf. The 
proxycache overlay should just be appended to your back-sql 
configuration. (I don't use back-sql, but I assume it will work.)
--

 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
 Symas: Premier OpenSource Development and Support