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Introduce the OpenLDAP server configured by iRedMail

This is a brief introduction of the OpenLDAP server configured by iRedMail. It may help a little if you want to migrate from/to other LDAP server.

LDAP schema files

iRedMail requires 7 LDAP schema files listed below (1-5 are shipped by OpenLDAP, no. 6 is shipped by Amavisd, no. 7 is shipped by iRedMail):

1. core.schema
2. corba.schema
3. cosine.schema
4. inetorgperson.schema
5. nis.schema
6. amavisd.schema (names are different on different linux/bsd distros)
7. iredmail.schema

If you're migrating to other LDAP server, it must include them all, otherwise you may not be able to add or update mail accounts.

Data structure

OpenLDAP configured by iRedMail has hard-coded / predictable structure, and Postfix / Dovecot / iRedAPD /... are configured to query LDAP based on this structure.

dc=xx,dc=xx
    |- o=domains
        |- domainName=example.com
            |- ou=Aliases
                | mail=alias@example.com
                | ...
            |- ou=Groups
                | mail=list@example.com
                | ...
            ...
            |- ou=Users
                |- mail=postmaster@example.com
                |- mail=xxx
                |- ...

With this predictable structure:

• it's easy to narrow down the query scope, the narrower the scope is, the better performance you gain.

• no need to performing a query first to get the full dn of ldap object you're going to modify.

If you don't use this structure:

• you have to update Postfix/Dovecot/iRedAPD/... config files to use different query scopes and filters.

• The web-based admin panel - iRedAdmin(-Pro) - heavily relies on the predictable structure, if you use different structure, you cannot manage mail accounts with iRedAdmin(-Pro).