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 Logical architecture

To design, deploy, and configure OpenStack, administrators must understand the logical architecture.

OpenStack modules are one of the following types:

Daemon

Runs as a background process. On Linux platforms, a daemon is usually installed as a service.

Script

Installs a virtual environment and runs tests. For example, the run_tests.sh script installs a virtual environment and runs unit tests on a service.

Command-line interface (CLI)

Enables users to submit API calls to OpenStack services through easy-to-use commands.

The following diagram shows the most common, but not the only, architecture for an OpenStack cloud:

 

Figure 1.2. Logical architecture


As in Figure 1.1, “OpenStack conceptual architecture”, end users can interact through the dashboard, CLIs, and APIs. All services authenticate through a common Identity Service and individual services interact with each other through public APIs, except where privileged administrator commands are necessary.

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