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The Practice of System and Network Administration, Second Edition by Thomas A. Limoncelli, Christina J. Hogan, Strata R. Chalup

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Chapter 8. Namespaces

In this chapter, we explain principles of organizing and managing namespaces. A namespace is a set of unique keys and associated attributes. Examples of namespaces are the account names in use, the printers available, the names of hosts, Ethernet addresses, service name/port number lists, and home directory location maps. Every namespace has attributes for each element. Account names have UIDs (UNIX) or SIDs (Windows), home directories, owners, and so on. Hostname attributes usually include IP addresses, hardware serial numbers, customer (owner) information, Ethernet MAC address, and so on.

The term namespace can be confusing because it can refer to either an abstract concept or a concrete thing. For example, usernames ...

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