Beyond the Buzzword: The Technical Reality of On-Premises, Private Cloud, and Public Cloud

Short summary

This article explains the technical differences between on-premises, private cloud, and public cloud infrastructure. It covers how cloud originated, NIST's five essential cloud properties (on-demand service, broad access, resource pooling, elasticity, measured service), and key architectural details like isolation, shared responsibility models, and egress costs. Understanding these distinctions is crucial for infrastructure and product decisions.

• •Cloud computing is distinguished by five NIST properties: on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service
• •Public cloud offers multi-tenant shared infrastructure with isolation enforced at hardware/hypervisor level, while private cloud is single-tenant but still satisfies all NIST properties
• •Key architectural considerations include blast radius isolation, shared responsibility models, availability zones, and egress costs that differ between on-prem, private, and public cloud

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