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Under component oriented principal, at high level CloudStack core can be fine-tuned to a number of (not limited to) components

API component

Implements CloudStack API, it also initiates logic orchestration flows (i.e., deploy a VM) which will be notified and picked up in Orchestration engine component

Orchestration Engine component

This components is the heart to drive all async-flows currently active in the system, it orchestrates high-level flow through messaging among networking/storage/compute components.

Data service component

This components provides the data service for objects within the Cloud.

Networking component

A component to implement networking provisioning

Storage Component

A component to implement storage provisioning

Compute Component

A component to implement hypervisor VM provisioning

Fabric Monitoring Component

A component dedicated for monitoring on fabric resources, for example,

monitoring of hypervisor host status

Fabric Admin Component

A component that implements fabric resource administration.

Service Framework Component (module?)

A component(or a module inside Orchestration Engine?) to provide service to launch component service in a VM and auto-scale the component service.

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