Cloud Computing Concept: Computer Science

LECTURE NOTES CLOUD COMPUTING CONCEPT Cloud computing is a technology that enables on-demand access to shared computing resources over the internet, such as servers, storage, applications, and services. The resources are typically provided by third-party providers, who own and manage the underlying infrastructure. Cloud computing allows users to scale up or down their usage of computing resources as needed, without having to invest in expensive hardware or infrastructure. This can lead to cost savings, increased efficiency, and improved flexibility for organizations that use cloud computing services. There are several delivery models in cloud computing, which are defined based on the level of control and responsibility that the customer and provider have over different aspects of the computing environment. The three main delivery models are: 1. Infrastructure as a Service (IaaS) - provides virtualized computing resources (servers, storage, networking) for the customer to build and manage their own infrastructure. 2. Platform as a Service (PaaS) - provides a complete platform for developing, deploying, and managing applications without worrying about the underlying infrastructure. 3. Software as a Service (SaaS) - provides a complete software application hosted and managed by the provider, accessible through a web browser or dedicated application. Examples of Cloud Computing Concepts :  Virtualization - dividing physical servers into multiple virtual servers.  Multi-tenancy - hosting multiple customers on the same infrastructure.  Elasticity - ability to quickly scale resources up or down as needed.  Self-service provisioning - customers can provision resources themselves.  Service-level agreements (SLAs) - agreements defining the level of service expected.  Pay-per-use billing - customers only pay for the resources they use.  Containers - a lightweight alternative to virtual machines for application deployment.  Serverless computing - a model in which the customer only pays for the exact amount of resources used to run the application. In cloud computing, deployment models refer to how the cloud infrastructure is provisioned and managed. There are four main deployment models:  Public Cloud: a cloud infrastructure available to the general public or large industry group.  Private Cloud: a cloud infrastructure exclusively used by a single organization.  Hybrid Cloud: a combination of public and private cloud infrastructures.  Community Cloud: a cloud infrastructure shared among several organizations with similar requirements. Some of the main considerations before switching to cloud computing, are as follows:  Internet availability and speed,  Service level agreement (SLAs),  Commitment/seriousness of the service provider,  Experience of service providers (especially in the field of cloud computing),  On-demand self-service,  The server computer is down,  Security and privacy,  Location of data and jurisdiction/legal provisions,  Data backup and DRP, and  Costs to be incurred. Based on the type of service Cloud Computing is divided into 3 (three), namely as follows:  Infrastructure as a Service (IaaS): Provides virtualized computing resources.  Platform as a Service (PaaS): It provides a platform for developing, testing, and deploying applications.  Software as a Service (SaaS): Provides fully functional software applications over the internet. Each layer provides a higher level of abstraction and requires less management by the customer, but also provides less flexibility and customization compared to lower layers.