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4 Server Structure
Contents
The retail project is designed to implement a complete operating system and
management structure for administering Linux-based cash registers (CR). The
CRs are implemented in a variety of hardware forms, with the main difference
being whether they are equipped with hard drives (diskless or diskful). Both
options must be supported. This section describes the required infrastructure
- server, server services, and management programs.
4.1 Requirements
The entire infrastructure is designed to be strictly centralized with the option
of complete central administration, but also with the option of delegating ad-
ministrative tasks to subunits. This produces the requirement for a role-based
privilege granting system for work and system administration. The solution
is very broadly scalable, so that a small shop with five cash registers can be
managed just as well as a large chain with a thousand branches.
The availability of server services is another central topic. For chains with
several branches, the link between the branches and the central office can be
assumed to be over WAN links of varying quality. The operation must also
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