8. Implementing PAM in Ingres : How to Implement Kerberos Authentication Using PAM : The krb5.conf File--Configure Kerberos
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The krb5.conf File--Configure Kerberos
The krb5.conf file tells Kerberos clients where the Kerberos server is on the network. On Linux and UNIX machines, krb5.conf typically resides on /etc.
The following krb5.conf file contains the minimum configuration for a Kerberos or Active Directory server on myHost.myDomain.com:
    default_realm = MYDOMAIN.COM
    INGRES.PRV = {
        admin_server = MYHOST.MYDOMAIN.COM
        myDomain.com = MYDOMAIN.COM
        .mydomain.com = MYDOMAIN.COM
Note:  The Kerberos realm defined by MYDOMAIN.COM happens to be the same as the network domain name and extension, but the realm can have a different name.