The RID Master is a domain controller role in Active Directory (AD) that is responsible for allocating a pool of Relative Identifiers (RIDs) to each domain controller in a domain. The RID pool is a range of unique identifiers that are used to create security principals, such as user and computer accounts, within the domain.
When a domain controller needs to create a new security principal, it requests a RID from the RID pool allocated to it by the RID Master. The RID Master then allocates a block of RIDs to the domain controller, which it can use to create new security principals. The domain controller then assigns the RIDs to the security principals it creates until the block of RIDs is exhausted. When the domain controller exhausts the block of RIDs, it requests another block of RIDs from the RID Master.
The RID Master manages the allocation of RIDs to domain controllers using a multi-master replication model. This means that all domain controllers in the domain have a read/write copy of the RID pool allocation information in their local AD database. The RID Master maintains the master copy of the RID pool allocation information, and any changes made to the RID pool allocation information are replicated to all domain controllers in the domain.
When a domain controller requests a new block of RIDs from the RID Master, the RID Master ensures that the block of RIDs it allocates is not already in use by any other domain controller in the domain. The RID Master does this by maintaining a list of RID pools that have been allocated to domain controllers and comparing the requested block of RIDs with the list of allocated RID pools.
In summary, the RID Master is responsible for allocating blocks of RIDs to domain controllers in a domain, and it ensures that the same block of RIDs is not allocated to multiple domain controllers. By managing the allocation of RIDs, the RID Master helps to ensure that new security principals can be created in the domain without running out of unique identifiers.
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