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Re: proxy-cache

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:

# 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