OpenLDAP as a Proxy cache only, no local database - caching

Question

I am trying to get a local LDAP proxy cache running. The idea is this:
Currently a computer (A) is sending all ldap requests to a remote ldap server (L)
Instead of that, there should be a proxy cache "server" running on A to act as an intermediate between A and L. The cache would store all queries and all their attributes (until it is filled up and then it starts "recycling").
OpenLDAP's Proxy Cache Engine looks pretty good, but there is not much information about how to set it up. There is an example config file, but I cannot get it to work.
When connected to the internet, running this command will successfully bind me.
ldapwhoami -vvv -h localhost -D "CN=Melka Martin,OU=something,OU=else,(...),DC=int,DC=somedomain,DC=com" -x -w <passwd>
However, each following request will still pool the remote LDAP server (as shown by sniffing the connection, and when the machine is disconnected from the internet, the local bind fails).
In the slapd output there is a lot of stuff, but the elligible:
56449abd QUERY NOT ANSWERABLE
56449abd QUERY CACHEABLE
This is the current config file, which should cache all the bind requests
database ldap
suffix "dc=int,dc=somedomain,dc=com"
rootdn "cn=admin,dc=int,dc=somedomain,dc=com"
rootpw <something>
uri ldap://dc-04.int.somedomain.com:389
overlay pcache
pcache hdb 100000 1 1000 100
pcacheAttrset 0 *
pcacheTemplate (sn=) 0 3600
pcacheBind (sn=) 0 3600 sub dc=int,dc=somedomain,dc=com
cachesize 200
directory /var/lib/ldap
index objectClass eq
index cn eq,sub
I have created the /var/lib/ldap directory, added a default DB_CONFIG file in there and then edited the slapd.conf file. If there are more things to do to set it up properly, could you instruct me?
I am a little confused about the rootdn/rootpw directives. They are used to write into the remote LDAP server, correct?
Edit: Below here is the original issue, which was resolved by using the full proper DN.
As this is supposed to only be a proxy cache, I shouldn't need to set up a local database. So the config file looks like this:
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/nis.schema
moduleload pcache.la
database ldap
suffix "dc=int,dc=somedomain,dc=com"
rootdn "dc=int,dc=somedomain,dc=com"
uri ldap://dc-04.int.somedomain.com:389
overlay pcache
pcache hdb 100000 1 1000 100
pcacheAttrset 0 *
pcacheTemplate (sn=) 0 3600
cachesize 20
directory /var/lib/ldap
index objectClass eq
index cn eq,sub
Now I would expect that any request to ldap://localhost would mirror to the remote LDAP, if not in the cache.
I use this command to test the auth on the remote server:
ldapwhoami -vvv -h dc-04.int.somedomain.com -p 389 -D melka#somedomain.com -x -w <passwd>
Which works well, I get the auth.
However, when I try to run the same command on localhost:
ldapwhoami -vvv -h localhost -p 389 -D melka#somedomain.com -x -w <passwd>
It fails, saying
ldap_initialize( ldap://localhost:389 )
ldap_bind: Invalid DN syntax (34)
additional info: invalid DN
Slapd is listening on localhost, netstat contains this line:
tcp 0 0 0.0.0.0:389 0.0.0.0:* LISTEN 10352/slapd
Is there something I am missing?
Thanks

Answer 1

melka#somedomain.com
That may be a DN in the target LDAP system, who knows, but it certainly isn't in OpenLDAP. You need to provide a proper Distinguished Name.