This example configures on the environment bellow:

• Domain name : SMB01
• Realm : SRV.SHAREWIZ
• Hostname : smb.srv.sharewiz

Install required packages

sudo apt install samba krb5-config winbind smbclient

and answer:

# set Realm
 
 +------------------+ Configuring Kerberos Authentication +------------------+
 | When users attempt to use Kerberos and specify a principal or user name   |
 | without specifying what administrative Kerberos realm that principal      |
 | belongs to, the system appends the default realm.  The default realm may  |
 | also be used as the realm of a Kerberos service running on the local      |
 | machine.  Often, the default realm is the uppercase version of the local  |
 | DNS domain.                                                               |
 |                                                                           |
 | Default Kerberos version 5 realm:                                         |
 |                                                                           |
 | SRV.SHAREWIZ_____________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+
 
# specify the hostname
 
 +------------------+ Configuring Kerberos Authentication +------------------+
 | Enter the hostnames of Kerberos servers in the SRV.SHAREWIZ Kerberos      |
 | realm separated by spaces.                                                |
 |                                                                           |
 | Kerberos servers for your realm:                                          |
 |                                                                           |
 | smb.srv.sharewiz_________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+
 
 
# specify the hostname
 
 +------------------+ Configuring Kerberos Authentication +------------------+
 | Enter the hostname of the administrative (password changing) server for   |
 | the SRV.SHAREWIZ Kerberos realm.                                          |
 |                                                                           |
 | Administrative server for your Kerberos realm:                            |
 |                                                                           |
 | smb.srv.sharewiz_________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+