TrueNASTrueNAS Nightly Development Documentation
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Kerberos Realms Screens

Kerberos is extremely complex. Only system administrators experienced with configuring Kerberos should attempt it. Misconfiguring Kerberos settings, realms, and keytabs can have a system-wide impact beyond Active Directory or LDAP, and can result in system outages. Do not attempt configure or make changes if you do not know what you are doing!
Kerberos is a computer network security protocol. It authenticates service requests between trusted hosts across an untrusted network (i.e., the Internet).

If you configure Active Directory, TrueNAS populates the realm fields and the keytab with what it discovers in AD. You can configure LDAP to communicate with other LDAP severs using Kerberos, or NFS if it is properly configured, but TrueNAS does not automatically add the realm or key tab for these services.

After AD populates the Kerberos realm and keytabs, do not make changes. Consult with your IT or network services department, or those responsible for the Kerberos deployment in your network environment for help. For more information on Kerberos settings refer to the MIT Kerberos Documentation.

Kerberos Realm Widget

The Kerberos Realms widget in the Advanced Settings on the Directory Services screen displays currently configured realms.

KerberosRealmsWidget

Add opens the Add Kerberos Realm configuration screen.

Click on any instance to open the Edit Kerberos Realm screen.

Click on the Kerberos Realms widget header to open the Kerberos Realms screen.

Kerberos Realms Screen

The Kerberos Realms screen displays a list view of realms configured on your TrueNAS system.

KerberosRealmsScreen

Actions includes the option to Add a new realm. Add opens the Add Kerberos Realm screen.

The more_vert button opens the actions options for the selected realm. Options are Edit which opens the Edit Kerberos Realm screen for the selected realm, and Delete that opens a delete confirmation dialog.

Add and Edit Kerberos Realm Screens

The settings found on the Add Kerberos Realm and Edit Kerberos Realm screens are the same.

Kerberos is extremely complex. Only system administrators experienced with configuring Kerberos should attempt it. Misconfiguring Kerberos settings, realms, and keytabs can have a system-wide impact beyond Active Directory or LDAP, and can result in system outages. Do not attempt configure or make changes if you do not know what you are doing!

AddKerberosRealmScreen

SettingDescription
Realm(Required) Enter the name of the realm as a domain name, For example, example.com. AD configured TrueNAS systems pre-populate this field with the required information.
KDCEnter the name of the Key Distribution Center (KDC).The KDC acts as as the third-party authentication service for Kerberos. Separate multiple values by pressing Enter. For example, kdc1.example.com press Enter then kdc2.example.com.
Admin ServerDefine the server that performs all database changes. Separate multiple values by pressing Enter.
Password ServerDefine the server that performs all password changes. Separate multiple values by pressing Enter.