by Atharvgyan.com

Cloud computing is a vast and dynamic field that involves the delivery of computing services including servers, storage, networking, databases, analytics, software, and intelligence over the internet to offer faster innovation, flexible resources, and economies of scale. Here is a comprehensive guide to help you learn about cloud computing:

1. Understanding the Basics:

Definition: Learn what cloud computing is and understand the key concepts, such as on-demand resources, scalability, and resource pooling.

Service Models:
Service Models in cloud computing refer to the different levels of abstraction at which cloud services are delivered. These models define the extent of control and responsibility that users have over the computing resources. The three primary service models are:

1. Infrastructure as a Service (IaaS):

Definition: IaaS provides virtualized computing resources over the internet. Users can rent virtual machines, storage, and networking infrastructure on a pay-as-you-go basis.

Characteristics:

Flexibility: Users have more control over the underlying infrastructure, allowing them to install and configure their own operating systems, applications, and middleware.

Scalability: Resources can be scaled up or down based on demand.

Examples: Amazon EC2, Microsoft Azure Virtual Machines, Google Compute Engine.

1. Platform as a Service (PaaS):

Definition: PaaS provides a platform that allows users to develop, run, and manage applications without dealing with the complexity of building and maintaining the underlying infrastructure.

Characteristics:

Abstraction: Users focus on application development and deployment, while the cloud provider handles the underlying infrastructure, including runtime, middleware, and development frameworks.

Productivity: PaaS accelerates the development process by providing tools and services for application development, such as databases, messaging queues, and development frameworks.

Examples: Heroku, Google App Engine, Microsoft Azure App Service.

1. Software as a Service (SaaS).

Definition: SaaS delivers software applications over the internet on a subscription basis. Users can access the software through a web browser without worrying about installation, maintenance, or infrastructure.

Characteristics: Accessibility: Applications are accessible from anywhere with an internet connection and are often accessed through a web browser.

Maintenance: The cloud provider is responsible for maintenance, updates, and security of the software.

Examples: Salesforce, Microsoft 365, Google Workspace, Dropbox.

Key Differences:

Control and Responsibility:

IaaS: Users have more control and responsibility over the infrastructure, including the operating system, applications, and data.

PaaS: Users focus on application development, while the cloud provider manages the underlying platform.

SaaS: Users have minimal control, focusing only on using the provided software without managing the infrastructure or platform.

Abstraction Level:

IaaS: Low-level abstraction, closer to traditional infrastructure management.

PaaS: Higher-level abstraction, focusing on application development and deployment.

SaaS: Highest level of abstraction, users interact primarily with the software application.
Deployment Models:
Deployment models in cloud computing refer to the way cloud services are provisioned and used by organizations. There are three primary deployment models: Public Cloud, Private Cloud, and Hybrid Cloud. Here's an explanation of each:

Public Cloud:

Definition: In a public cloud deployment model, cloud resources are owned and operated by a third-party cloud service provider, and these resources are made available to the general public or a large industry group.

Characteristics:

Accessibility: Services are accessible over the internet to anyone who wants to use them.

Scalability: Resources can be scaled up or down based on demand.

Cost Model: Typically follows a pay-as-you-go or subscription-based pricing model.

Shared Resources: Computing resources are shared among multiple customers (multitenancy).

Examples: Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP).

Private Cloud:

Definition: In a private cloud deployment model, cloud resources are used exclusively by a single organization. The infrastructure may be located on-premises or hosted by a third-party service provider.

Characteristics:

Dedicated Resources: The cloud infrastructure is used only by the organization that owns it.

Control: Provides greater control over security, compliance, and customization.

Costs: Typically involves higher upfront costs but may offer cost savings over time.

Scalability: Can be less flexible in terms of scaling compared to public clouds.

Examples: VMware Cloud Foundation, OpenStack.

Hybrid Cloud:

Definition: A hybrid cloud deployment model combines elements of both public and private clouds. It allows data and applications to be shared between them.

Characteristics:

Flexibility: Organizations can leverage the benefits of both public and private clouds.

Data Portability: Data and applications can be moved between public and private clouds based on requirements.

Scalability: Offers scalability and additional resources from the public cloud when needed.

Control: Provides the ability to keep sensitive workloads on-premises while using the public cloud for less critical components.

Examples: An organization might use a private cloud for sensitive data and a public cloud for scalable, less-sensitive workloads.
Considerations for Choosing a Deployment Model:

Security Requirements: Organizations with strict security and compliance needs may prefer private or hybrid clouds.

Scalability: Public clouds are generally more scalable, making them suitable for dynamic workloads.

Cost Considerations: Different deployment models have different cost structures, and organizations need to consider their budget and cost models.

Data Sensitivity: The sensitivity of data and the regulatory environment can influence the choice of deployment model.

1. Cloud Service Providers:

Familiarize yourself with major cloud service providers, such as Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP), and others.

Explore the services offered by each provider and understand their strengths and weaknesses.

1. Core Services:

Compute Services:

Virtual Machines (VMs)
Containers (e.g., Docker, Kubernetes)

Storage Services:
Object Storage (e.g., Amazon S3, Azure Blob Storage)
Block Storage (e.g., Amazon EBS, Azure Managed Disks)
File Storage (e.g., Amazon EFS, Azure Files)