iredmail-doc/en_US/faq/openldap.intro.md

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# Introduce the OpenLDAP server configured by iRedMail
[TOC]
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
1. corba.schema
1. cosine.schema
1. inetorgperson.schema
1. nis.schema
1. amavisd.schema (names are different on different linux/bsd distros)
1. 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).