Deployment models
Public, private, community, hybrid and multicloud, compared on cost, control, compliance, elasticity and reversibility; regions, availability zones, data sovereignty and vendor lock-in.
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- 5 topics
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The outline, topic by topic
Each topic is weighted the way the exam weighs it.
- Concepts
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A few cards from the deck
Public cloud: what is it?
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Infrastructure owned by a provider and open to all customers, who share the hardware, with no upfront investment.
It gives the greatest elasticity and no initial cost, but little control over the exact location and hardware configuration.
A company keeps its payroll on its own servers and hosts its online shop at a public provider, with a link between them. Which model is this?
- Hybrid
- Community
- Private
- Multicloud
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Hybrid
A private infrastructure combined with a public one, linked: that is the definition of hybrid. Multicloud implies several cloud providers, not an in-house cloud plus one provider.
When a private infrastructure saturates and the excess load is sent to a public cloud, it is called cloud ….
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When a private infrastructure saturates and the excess load is sent to a public cloud, it is called cloud bursting.
Bursting is only billed during the peak. It needs a link between the two infrastructures and an application able to run on both sides.
Private cloud: what is it?
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Infrastructure reserved for a single organisation, whether it runs it itself or has it run, on site or at a third party.
Control and compliance are at their best, but the organisation pays for the hardware and the spare capacity: elasticity is limited by what it has bought.
A laboratory must keep its health data at a certified host and absorb three weeks of intensive computing a year. Which constraint decides, and which model follows?
- Upfront cost: everything in the public cloud, data included
- Elasticity: a private cloud sized for the yearly peak
- Data compliance: hybrid, with computing bursting into the public side
- Reversibility: multicloud, data copied everywhere
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Data compliance: hybrid, with computing bursting into the public side
Health data dictates where it is hosted; the occasional computing can be rented for three weeks. Sizing a private cloud for that peak would pay for idle hardware the rest of the year.