Cloud Computing Basics Explained

Key Concepts

• Cloud Models
• Cloud Services
• Virtualization
• Scalability
• Elasticity
• High Availability
• Disaster Recovery
• Security
• Cost Management
• Compliance

Cloud Models

Cloud models define the deployment and access methods for cloud services. The three primary models are:

• Public Cloud: Services are provided over the public internet and are available to anyone who wants to purchase them.
• Private Cloud: Services are operated solely for a single organization, whether managed internally or by a third party.
• Hybrid Cloud: Combines public and private clouds, allowing data and applications to be shared between them.

Imagine public cloud as a shared library where anyone can access books, private cloud as a personal library in your home, and hybrid cloud as a combination of both.

Cloud Services

Cloud services are categorized into three main types:

• Infrastructure as a Service (IaaS): Provides virtualized computing resources over the internet.
• Platform as a Service (PaaS): Provides a platform allowing customers to develop, run, and manage applications without dealing with the infrastructure.
• Software as a Service (SaaS): Delivers software applications over the internet, on a subscription basis.

Think of IaaS as renting a computer, PaaS as renting a development environment, and SaaS as using a web-based application like Gmail.

Virtualization

Virtualization is the creation of a virtual version of something, such as a server, storage device, or network resources. It allows multiple virtual machines (VMs) to run on a single physical machine.

Consider virtualization as having multiple workspaces on a single desk. Each workspace can be used for different tasks, but they all share the same physical desk.

Scalability

Scalability refers to the ability of a system to handle increased load by adding resources. It can be vertical (adding more power to existing servers) or horizontal (adding more servers).

Imagine scalability as expanding a restaurant. Vertical scaling is like adding more floors, while horizontal scaling is like opening more branches.

Elasticity

Elasticity is the ability to automatically scale resources up or down based on demand. It ensures that resources are available when needed and released when not.

Think of elasticity as a smart thermostat that adjusts the heating based on the room's temperature, ensuring comfort without wasting energy.

High Availability

High Availability (HA) ensures that services remain operational for a long period of time. It involves redundancy and failover mechanisms to minimize downtime.

Consider high availability as a backup generator that kicks in automatically when the main power goes out, ensuring continuous electricity.

Disaster Recovery

Disaster Recovery (DR) involves restoring IT infrastructure and operations after a disaster. It includes backup strategies, data replication, and failover systems.

Think of disaster recovery as having a fire escape plan and a safe place to gather in case of an emergency.

Security

Cloud security involves protecting data, applications, and infrastructure in the cloud. It includes encryption, access controls, and monitoring.

Consider cloud security as a fortress with multiple layers of defense, including walls, guards, and surveillance cameras.

Cost Management

Cost management in the cloud involves monitoring and controlling expenses. It includes optimizing resource usage, setting budgets, and using cost-effective services.

Think of cost management as budgeting for a household. You track expenses, find ways to save, and ensure you stay within your budget.

Compliance

Compliance in the cloud involves adhering to legal and regulatory requirements. It includes data protection laws, industry standards, and audit procedures.

Consider compliance as following traffic rules while driving. You need to know and adhere to the laws to avoid penalties and ensure safety.