How to Install OpenLDAP on CentOS 7


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Installing OpenLDAP on CentOS 7

OpenLDAP is an open-source implementation of the Lightweight Directory Access Protocol (LDAP) commonly used as a directory service for managing user authentication and centralized access control. It provides a way to store and organize information about users, groups, and other objects in a centralized directory.

Here is a step-by-step guide to installing OpenLDAP on CentOS 7:

  1. Update the system packages:
    sudo yum update
  2. Install the necessary packages:
    sudo yum install openldap openldap-servers openldap-clients
  3. Start and enable the slapd service:
    sudo systemctl start slapd sudo systemctl enable slapd
  4. Configure the LDAP server by modifying the /etc/openldap/slapd.d/cn=config.ldif file:
    sudo nano /etc/openldap/slapd.d/cn=config.ldif
  5. Add the following lines to the end of the file to enable the server to listen on all available interfaces:
    olcTLSCipherSuite: HIGH:MEDIUM:-SSLv2 olcTLSCertificateFile: /etc/pki/tls/certs/ldap-cert.pem olcTLSCertificateKeyFile: /etc/pki/tls/certs/ldap-key.pem olcTLSCACertificateFile: /etc/pki/tls/certs/ca-bundle.crt olcTLSCertificateChainFile: /etc/pki/tls/certs/ca-bundle.crt 
  6. Save the file and exit the text editor.
  7. Restart the LDAP server:
    sudo systemctl restart slapd
  8. Configure the LDAP administrative user and password:
    sudo slappasswd
    Enter a secure password and copy the generated encrypted password.
  9. Open the /etc/openldap/slapd.d/cn=config/olcDatabase={2}hdb.ldif file for editing:
    sudo nano /etc/openldap/slapd.d/cn=config/olcDatabase={2}hdb.ldif
  10. Search for the "olcRootPW" line and replace the value with the encrypted password you copied earlier.
  11. Save the file and exit the text editor.
  12. Restart the LDAP server:
    sudo systemctl restart slapd
  13. You can now configure OpenLDAP to suit your specific needs by adding more entries and attributes to the LDAP directory.

Once installed and configured, OpenLDAP can be used to provide authentication services for various types of applications and services, such as web applications, email servers, and file servers. It offers a flexible and scalable solution for managing user accounts and access control in a centralized manner.

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