On a system running Unix or a Unix-like OS, Idmap acts as a translator. Windows Security Identifier (SID)s convert to a user ID (UID) and group ID (GID). Use the Identity Mapping (Idmap) screen to configure Idmap service on the TrueNAS.
Click Edit IDMAP on the Active Directory > Advanced Options screen. The Edit Idmap screen displays. It lists all domains configured on the TrueNAS.
You can customize the information displayed in the Idmap table.
The SCALE CLI guide is a work in progress! New namespace and command documentation is continually added and maintained, so check back here often to see what is new!
Lightweight Directory Access Protocol (LDAP) is an industry standard. Directory information services deployed over an Internet Protocol (IP) network can use LDAP. Configure LDAP server settings on your TrueNAS using the Directory Services > LDAP screen.
Click SAVE to save settings.
Click ADVANCED OPTIONS to display extra LDAP configuration options.
Click REBUILD DIRECTORY SERVICE CACHE to resync the cache if it becomes out of sync. Or if fewer users than expected are available in the permissions editors.
The SCALE Directory Services section contains options to edit directory domain and account settings, set up Idmapping, and configure authentication and authorization services in TrueNAS SCALE.
Directory Services Screen The Directory Services screen opens with two options, Active Directory and LDAP. You can configure one or the other but not both.
Configure Active Directory opens the Active Directory configuration screen.
Configure LDAP opens the LDAP configuration screen.
After configuring Active Directory or LDAP, the Directory Services screen includes the widgets for each option.
Idmap in Linux is essentially a translation of a range of IDs into another or the same range of IDs. Idmap works in conjunction with the Winbind facility of SAMBA to map owner and group SIDs to user IDs (UIDs) and group IDs (GIDs).
Only administrators experienced with configuring Id mapping should attempt to add new or edit existing idmaps. Misconfiguration can impact system operation. Idmap Widget The Idmap widget in the Advanced Settings on the Directory Services screen displays idmaps added to SCALE.
Idmap settings exist for the purpose of integration with an existing directory domain to ensure that UIDs and GIDs assigned to Active Directory users and groups have consistent values domain-wide. The correct configuration therefore relies on details that are entirely external to the TrueNAS server, e.g., how the AD administrator has configured other Unix-like computers in the environment.
The default is to use an algorithmic method of generating IDs based on the RID component of the user or group SID in Active Directory.
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