Domain:
  Note: domain name should follows RFC 1035
  1. Domain name should contains one or more labels separated by dots.
  2. Labels must start with a latin letter (in upper and lower case), end with a letter or digit, and have as interior characters only letters, digits, and hyphen.
  3. Labels must be 63 characters or less.
  4. Domain should not has labels named 'localhost', 'localdomain' and 'local'. They are reserved for internal purposes.
Examples: domain, school-33, department.company
 
Serve kerberos domain:
 
  Attention: Domain change needs reboot for normal operation
   

  Current status:
  Resolver:
  Access:
  DHCPD:
  LDAP:
  KDC:
  Samba: