CentOS 6
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Kerberos Authentication
Enable Kerberos Authentication to limit access on specific web pages. Users can authenticate via Windows Active Directory.
Therefore it's necessarry to be running Windows Active Directory in your LAN.
Domain Server : Windows Server 2012 R2
Domain Name : FD3S01
Hostname : fd3s.srv.world
[2] For example, set Kerberos Auth under the [/var/www/html/auth-kerberos] directory.
[root@www ~]#
yum -y install mod_auth_kerb
[root@www ~]#
vi /etc/krb5.conf
# line 7: change to Realm name

default_realm =
# add follows under [realms] section

  kdc = fd3s.srv.world
  admin_server = fd3s.srv.world
# add follows under [domain_realm] section

 .srv.world = SRV.WORLD
 srv.world = SRV.WORLD
# create keytab : HTTP/[AD's hostname or IP address]@[Realm name]

[root@www ~]#
echo "HTTP/fd3s.srv.world@SRV.WORLD" > /etc/httpd/conf.d/krb5.keytab
[root@www ~]#
vi /etc/httpd/conf.d/auth_kerb.conf
# add to the end

<Directory /var/www/html/auth-kerberos>
    AuthType Kerberos
    AuthName "Kerberos Authntication"
    KrbAuthRealms SRV.WORLD
    Krb5Keytab /etc/httpd/conf.d/krb5.keytab
    KrbMethodNegotiate Off
    KrbSaveCredentials Off
    KrbVerifyKDC Off
    Require valid-user

# create a test page

[root@www ~]#
mkdir /var/www/html/auth-kerberos

[root@www ~]#
vi /var/www/html/auth-kerberos/index.html
<div style="width: 100%; font-size: 40px; font-weight: bold; text-align: center;">
Test Page for Kerberos Auth

[root@www ~]#
/etc/rc.d/init.d/httpd restart

Stopping httpd:     [  OK  ]
Starting httpd:     [  OK  ]
[3] Access to the test page with a Web browser on Client and authenticate with a user which is on Active Directory.
[4] Just accessed.