Install OpenLDAP Server on CentOS

Linux Tutorials - Herong's Tutorial Examples

∟LDAP (Lightweight Directory Access Protocol)

∟Install OpenLDAP Server on CentOS

This section provides a tutorial example on how to install OpenLDAP server on a CentOS 6 computer.

How To Install OpenLDAP Server on CentOS Systems? There are two options to install OpenLDAP on CentOS Systems:

Using pre-build packages - If you are using CentOS 7 or 6, there are pre-build packages of OpenLDAP server old releases available for you to install directly.
Using source code - If you are using CentOS 8, there is no pre-build package available. So you have to try to build it from source code.

Here are steps to install OpenLDAP Server on CentOS 6.

1. Set the "base" package repository to getpagespeed.com, which is the only repository available for CentOS 6 packages.

herong$ sudo curl https://www.getpagespeed.com/files/centos6-eol.repo \
  --output /etc/yum.repos.d/CentOS-Base.repo

2. Install OpenLDAP server package.

herong$ sudo yum install openldap-servers

Installed:
  openldap-servers.i686 0:2.4.40-16.el6

3. Start the OpenLDAP server.

herong$ sudo service slapd start
Starting slapd:                                            [  OK  ]

herong$ sudo service slapd status
slapd (pid  24192) is running...

4. Verify the server installation.

herong$ sudo slaptest
  60597f72 bdb_db_open: warning -
    no DB_CONFIG file found in directory /var/lib/ldap: (2).
  Expect poor performance for suffix "dc=my-domain,dc=com".
  config file testing succeeded

herong$ sudo slapcat
  6059383f The first database does not allow slapcat;
    using the first available one (2)
  6059383f bdb_db_open: warning -
    no DB_CONFIG file found in directory /var/lib/ldap: (2).
  Expect poor performance for suffix "dc=my-domain,dc=com".

The output tells us that:

The OpenLDAP server is running.
The first directory database, which is the monitor database, is not allowed to accdess.
The second directory database is configured to the "my-domain.com" domain name. But it has no entries.