1.5.4 Cloud Computing

Cloud computing is a technology model that provides access to computing resources and services over the internet, rather than owning and maintaining physical hardware and infrastructure.

Definition

Cloud computing is a technology model that provides access to computing resources and services over the internet, rather than owning and maintaining physical hardware and infrastructure. In a cloud computing environment, users can access and use computing resources such as servers, storage, databases, networking, software, and analytics through the internet.

Main Idea

Cloud computing has become a fundamental technology for businesses and individuals, offering scalability, cost-effectiveness, and the ability to innovate rapidly without the burden of managing physical infrastructure.

Core Concept

Key Characteristics of Cloud Computing The book lists the following key characteristics: 1. On-Demand Self-Service: Users can provision and manage computing resources as needed, without requiring human intervention from service providers. 2. Broad Network Access: Services and resources are accessible over the network and can be accessed by various devices with internet connectivity.

3. Resource Pooling: Computing resources are shared and pooled to serve multiple customers. Resources dynamically adjust to meet demand. 4. Rapid Elasticity: Resources can be quickly scaled up or down to accommodate changes in demand, providing flexibility and cost efficiency. 5. Measured Service: Usage of computing resources is monitored, controlled, and billed based on the actual usage. 6. Security: Cloud providers implement robust security measures to protect data and resources. This includes encryption, identity and access management, and compliance with industry standards and regulations.

Detailed Explanation

Service Models Cloud computing is typically categorized into three service models: i) Infrastructure as a Service (IaaS): This model delivers virtualized computing resources, including virtual machines, storage, and networks, via the internet. ii) Platform as a Service (PaaS): It offers a platform that includes tools, services, and frameworks for application development, without the complexity of managing underlying infrastructure. iii) Software as a Service (SaaS):

SaaS delivers software applications through the internet on a subscription basis, eliminating the need for users to locally install, maintain, or update software. Deployment Models Cloud computing is typically categorized into four deployment models: i) Public Cloud: In this model, cloud resources are owned and operated by a third-party cloud service provider and are made available to the general public. ii) Private Cloud: In this model, cloud resources are used exclusively by a single organization, providing more control and customization over the infrastructure. iii) Hybrid Cloud: It combines elements of both public and private clouds, allowing data and applications to be shared between them. iv) Community Cloud: In this, the cloud infrastructure is shared by several organizations with common interests, such as regulatory requirements or industry standards. Examples of Cloud Computing Services The book gives the following examples: Amazon Web Services (AWS): Offers a wide range of cloud services, including computing power , storage, databases, machine learning, and more. Microsoft Azure: Provides cloud services for computing, analytics, storage, and networking, along with tools for building, deploying, and managing applications.

Google Cloud Platform (GCP): Offers cloud services for computing, storage, machine learning, and data analytics, along with various development tools. IBM Cloud: Provides a range of cloud computing services, including IaaS, PaaS, and SaaS.

Important Points

• Cloud computing provides access to computing resources and services over the internet.
• Users can access servers, storage, databases, networking, software, and analytics through the internet.
• Key characteristics: On-Demand Self-Service, Broad Network Access, Resource Pooling, Rapid Elasticity, Measured Service,
• Security.
• Service models: IaaS, PaaS, SaaS.
• Deployment models: Public Cloud, Private Cloud, Hybrid Cloud, Community Cloud.
• Examples: AWS, Microsoft Azure, Google Cloud Platform (GCP), IBM Cloud.
• Cloud computing offers scalability, cost-effectiveness, and rapid innovation.

Remember

• Cloud computing = computing resources and services over the internet.
• Key characteristics: On-Demand Self-Service, Broad Network Access, Resource Pooling, Rapid Elasticity, Measured Service,
• Security.
• Service models: IaaS (Infrastructure), PaaS (Platform), SaaS (Software).
• Deployment models: Public, Private, Hybrid, Community.
• Examples: AWS, Microsoft Azure, GCP , IBM Cloud.
• Benefits: scalability, cost-effectiveness, rapid innovation.

Common Mistakes

• Confusing service models (IaaS, PaaS, SaaS) with deployment models (Public, Private, Hybrid, Community). They are two
• separate categories.
• Thinking cloud computing requires users to own and maintain physical hardware. That is the opposite of cloud computing.
• Forgetting that Resource Pooling means resources are shared among multiple customers.
• Mixing up Rapid Elasticity (scaling resources up or down quickly) with Measured Service (billing based on actual usage).
• Assuming the Community Cloud is the same as the Public Cloud. The Community Cloud is shared by several organizations
• with common interests.
• Forgetting that the Hybrid Cloud combines elements of both public and private clouds.

Quick Revision

Cloud computing is a technology model that provides access to computing resources and services over the internet, rather than owning and maintaining physical hardware and infrastructure. In a cloud computing environment, users can access and use computing resources such as servers, storage, databases, networking, software, and analytics through the internet. Cloud computing has become a fundamental technology for businesses and individuals, offering scalability, cost-effectiveness, and the ability to innovate rapidly without the burden of managing physical infrastructure. The key characteristics of cloud computing include On-Demand Self-Service, Broad Network Access, Resource Pooling, Rapid Elasticity, Measured Service, and Security. Cloud computing is typically categorized into three service models (IaaS, PaaS, SaaS) and four deployment models (Public, Private, Hybrid, Community). Examples of cloud computing services include Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP), and IBM Cloud.

60-Second Revision

Cloud computing = resources and services over the internet. Key characteristics: On-Demand Self-Service, Broad Network Access, Resource Pooling, Rapid Elasticity, Measured Service, Security. Service models: IaaS (Infrastructure), PaaS (Platform), SaaS (Software).

Deployment models: Public, Private, Hybrid, Community. Examples: AWS, Microsoft Azure, GCP , IBM Cloud. Warning: do not confuse service models with deployment models.