Cloud Computing Models
Infrastructure as a Service (IaaS)
contains the basic building blocks for cloud IT and typically provides access to networking features, computers (virtual or on dedicated hardware), and data storage space.Platform as a Service (PaaS)
removes the need for your organization to manage the underlying infrastructure (usually hardware and operating systems) and allows you to focus on the deployment and management of your applications. You don’t need to worry about resource procurement, capacity planning, software maintenance, patching, or any of the other undifferentiated heavy lifting involved in running your application.Software as a Service (SaaS)
provides you with a completed product that is run and managed by the service provider. you do not have to think about how the service is maintained or how the underlying infrastructure is managed; you only need to think about how you will use that particular piece of software.Cloud Computing Deployment Models
Cloud
A cloud-based application is fully deployed in the cloud and all parts of the application run in the cloud.On-premise
On-premises deployment doesn’t provide many of the benefits of cloud computing but is sometimes sought for its ability to provide dedicated resources.Hybrid
A hybrid deployment is a way to connect infrastructure and applications between cloud-based resources and existing resources that are not located in the cloud.
// The deployment of resources on-premises, using virtualization and
resource management tools, is sometimes called the “private cloud.”
Global Infrastructure
The AWS Cloud infrastructure is built around AWS Regions and
Availability Zones. An AWS Region is a
physical location in the world where we have multiple Availability
Zones. Availability Zones consist of one or
more discrete data centers, each with redundant power, networking, and
connectivity, housed in separate facilities.
// Each Amazon Region is designed to be completely isolated from the
other Amazon Regions. This achieves the greatest possible fault
tolerance and stability.
// Each Availability Zone is isolated, but the Availability Zones in a Region are connected through low-latency links. Each Availability Zone is designed as an independent failure zone. This means that Availability Zones are physically separated within a typical metropolitan region and are located in lower risk flood plains (specific flood zone categorization varies by AWS Region).
// AWS provides you with the flexibility to place instances and store data within multiple geographic regions as well as across multiple Availability Zones within each AWS Region
// Each Availability Zone is isolated, but the Availability Zones in a Region are connected through low-latency links. Each Availability Zone is designed as an independent failure zone. This means that Availability Zones are physically separated within a typical metropolitan region and are located in lower risk flood plains (specific flood zone categorization varies by AWS Region).
// AWS provides you with the flexibility to place instances and store data within multiple geographic regions as well as across multiple Availability Zones within each AWS Region