LECTURE 16 IN COMPUTER SCIENCE ENGINEERING

Lecture 16: Cloud Computing and Virtualization

In this lecture, we explore Cloud Computing and Virtualization, two key technologies that have revolutionized the way computing resources are delivered and consumed. Cloud computing provides on-demand access to computing resources over the Internet, while virtualization enables the efficient use of hardware by creating multiple simulated environments on a single physical system.

1. Introduction to Cloud Computing

Cloud computing is the delivery of computing services—such as servers, storage, databases, networking, software, and analytics—over the Internet (“the cloud”) instead of local infrastructure. This allows businesses and individuals to scale resources on demand and pay only for what they use.

2. Characteristics of Cloud Computing

On-Demand Self-Service: Users can access resources without manual intervention.
Broad Network Access: Services are available over the Internet from anywhere.
Resource Pooling: Multiple users share pooled computing resources.
Rapid Elasticity: Resources scale up or down based on demand.
Measured Service: Usage is metered and billed accordingly.

3. Service Models of Cloud Computing

IaaS (Infrastructure as a Service): Provides virtualized hardware (e.g., AWS EC2, Google Compute Engine).
PaaS (Platform as a Service): Provides development platforms and tools (e.g., Google App Engine, Heroku).
SaaS (Software as a Service): Provides ready-to-use software applications (e.g., Gmail, Microsoft 365).

4. Deployment Models of Cloud Computing

Public Cloud: Services provided over the public Internet (e.g., AWS, Azure, GCP).
Private Cloud: Cloud infrastructure dedicated to a single organization.
Hybrid Cloud: Combination of public and private cloud environments.
Community Cloud: Shared by organizations with common interests (e.g., universities, government agencies).

5. Introduction to Virtualization

Virtualization is the process of creating virtual versions of computing resources such as operating systems, servers, storage devices, or networks. It allows multiple virtual environments to run on the same physical hardware, maximizing resource utilization.

6. Types of Virtualization

Server Virtualization: Multiple virtual servers run on a single physical machine.
Storage Virtualization: Abstracts physical storage into a single pool of resources.
Network Virtualization: Creates virtual networks independent of physical hardware.
Desktop Virtualization: Provides virtual desktops to end-users (VDI solutions).

7. Hypervisors

A hypervisor is the software layer that enables virtualization by creating and managing virtual machines (VMs).

Type 1 (Bare-Metal): Runs directly on hardware (e.g., VMware ESXi, Microsoft Hyper-V).
Type 2 (Hosted): Runs on an existing operating system (e.g., Oracle VirtualBox, VMware Workstation).

8. Relationship Between Cloud Computing and Virtualization

Virtualization is the underlying technology that makes cloud computing possible. Cloud providers use virtualization to allocate and manage resources efficiently across multiple customers, enabling scalability and cost-effectiveness.

9. Benefits of Cloud Computing and Virtualization

Cost savings (reduced need for physical infrastructure).
Flexibility and scalability on demand.
Improved disaster recovery and backup solutions.
Better utilization of hardware resources.
Global accessibility and collaboration.

10. Challenges and Concerns

Security and Privacy: Protecting sensitive data in the cloud.
Downtime Risks: Service outages may impact business operations.
Vendor Lock-In: Difficulty in switching providers due to dependency.
Compliance: Meeting regulatory and legal requirements for data storage.

11. Applications

Enterprise IT infrastructure and hosting.
Cloud-based storage and file sharing (Dropbox, Google Drive).
Streaming services (Netflix, Spotify).
Virtual labs and test environments.
Remote work and collaboration tools (Zoom, Microsoft Teams).

12. Summary

Cloud computing delivers computing resources over the Internet.
Virtualization enables multiple environments on one physical machine.
Service models: IaaS, PaaS, SaaS; Deployment models: public, private, hybrid, community.
Hypervisors manage virtual machines (Type 1 and Type 2).
Together, cloud and virtualization enable cost-effective, scalable, and flexible computing solutions.

Next Lecture (17): Internet of Things (IoT)

LECTURE 17 IN COMPUTER SCIENCE ENGINEERING