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Re: Loading LDAP schema files into cn=config

On 29/06/11 11:59, Howard Chu wrote:

Having started to look at the changes required to migrate from a
slapd.conf setup to a cn=config setup, one of things I'm struggling with
is how to load new LDAP schemas into cn=config.

I've seen the guides similar to this one here:
which suggest hacking together a temporary slapd.conf file containing
just the include directives, run slaptest, and then hack the output so
that it can be loaded into cn=config using ldapadd.

His step 1 and 2 were fine. Everything after that is garbage.

1: schemaConvert.conf
include /etc/ldap/schema/core.schema
include /etc/ldap/schema/cosine.schema
include /etc/ldap/schema/nis.schema
include /etc/ldap/schema/inetorgperson.schema
include samba.schema

2: slaptest
mkdir config && slaptest -f schemaConvert.conf -F config

3: slapcat

slapcat -F config -n0 -s cn=schema,cn=config

and all of your converted schema will pop out, ready to be slapadd'd or
ldapadd'd anywhere else.

Hi Howard,

Thanks for the response - this makes a bit more sense now. Just to clarify another point: when you generate schemaConvert.conf, I guess that you need to include *all* schemas in your current cn=config matching the existing order, as well as the new one you are trying to add?

Also that begs another question: what happens if you want to modify an existing schema, e.g. if I need to hack a schema by hand and reload it into openldap so that it takes effect? Normally I would change the schema file on disk, restart slapd and it would just work.

With cn=config, I'm guessing I can't just delete the relevant schema entry from LDAP and re-add it since there would be a small window whereby the schema would be missing/invisible to slapd. This could cause all sorts of issues, such as pushing the incremental deletion out to any slaves, as well as breaking any concurrent lookups... :(



Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs