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Identify and Fix LDAP and Kerberos Identity Management Issues

In this exercise, you will troubleshoot and resolve authentication issues with both LDAP and Kerberos. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 1h 30m
Last updated
Clock icon Aug 29, 2025

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Table of Contents

  1. Challenge

    Verify LDAP and Kerberos logins on Server1.

    On Server1 (10.0.1.10)

    Attempt to SSH in as testuser01 and receive a Kerberos ticket:

    ssh testuser01@localhost

    kinit

    LDAP seems functional, but Kerberos is broken. View the Kerberos config:

    cat /etc/krb5.conf

    Modify /etc/krb5.conf:

    vim /etc/krb5.conf

    Change EXAMPLE_COM to EXAMPLE.COM.

    Use authconfig to enable Kerberos logins:

    authconfig-tui

    SSH in as testuser01 and receive a Kerberos ticket:

    ssh testuser01@localhost

    kinit

    klist

  2. Challenge

    Verify LDAP and Kerberos logins on Server2.

    On Server2 (10.0.1.11)

    Attempt to SSH in as testuser01:

    ssh testuser01@localhost

    Use getent to retrieve account information about testuser01:

    getent passwd testuser01

    Verify LDAP and Kerberos logins are enabled:

    cat /etc/sysconfig/authconfig

    User authconfig-tui to modify LDAP settings:

    authconfig-tui

    Use getent to retrieve account information about testuser01:

    getent passwd testuser01

    SSH in as testuser01 and receive a Kerberos ticket:

    ssh testuser01@localhost

    kinit

    klist
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