[Modify/Delete] Remove Notes for Some Problem
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Kanani Nirav
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# Cloud Computing
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- [Cloud Computing](#cloud-computing)
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- [What is Cloud Computing?](#what-is-cloud-computing)
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- [The Deployment Models of the Cloud](#the-deployment-models-of-the-cloud)
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- [The Five Characteristics of Cloud Computing](#the-five-characteristics-of-cloud-computing)
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- [Six Advantages of Cloud Computing](#six-advantages-of-cloud-computing)
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- [Problems solved by the Cloud](#problems-solved-by-the-cloud)
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- [Types of Cloud Computing](#types-of-cloud-computing)
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- [Example of Cloud Computing Types](#example-of-cloud-computing-types)
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- [Pricing of the Cloud – Quick Overview](#pricing-of-the-cloud--quick-overview)
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- [AWS Cloud Use Cases](#aws-cloud-use-cases)
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- [AWS Global Infrastructure](#aws-global-infrastructure)
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- [AWS Regions](#aws-regions)
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- [How to choose an AWS Region?](#how-to-choose-an-aws-region)
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- [AWS Availability Zones](#aws-availability-zones)
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- [AWS Points of Presence (Edge Locations)](#aws-points-of-presence-edge-locations)
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- [Tour of the AWS Console](#tour-of-the-aws-console)
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- [Shared Responsibility Model](#shared-responsibility-model)
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## What is Cloud Computing?
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- Cloud computing is the on-demand delivery of compute power, database storage, applications, and other IT resources
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- Through a cloud services platform with pay-as-you-go pricing
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- You can provision exactly the right type and size of computing resources you need
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- You can access as many resources as you need, almost instantly
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- Simple way to access servers, storage, databases and a set of application services
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- Amazon Web Services owns and maintains the network-connected hardware required for these application services, while you provision and use what you need via a web application.
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### The Deployment Models of the Cloud
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| **Private Cloud:** | **Public Cloud:** | **Hybrid Cloud:** |
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| ------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------- |
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| Cloud services used by a single organization, not exposed to the public. | Cloud resources owned and operated by a thirdparty cloud service provider delivered over the Internet. | Keep some servers on premises and extend some capabilities to the Cloud |
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| Complete control | Six Advantages of Cloud Computing | Control over sensitive assets in your private infrastructure |
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| Security for sensitive applications | | Flexibility and costeffectiveness of the public cloud |
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| Meet specific business needs | |
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### The Five Characteristics of Cloud Computing
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- **On-demand self service:**
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- Users can provision resources and use them without human interaction from the service provider
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- **Broad network access:**
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- Resources available over the network, and can be accessed by diverse client platforms
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- **Multi-tenancy and resource pooling:**
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- Multiple customers can share the same infrastructure and applications with security and privacy
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- Multiple customers are serviced from the same physical resources
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- **Rapid elasticity and scalability:**
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- Automatically and quickly acquire and dispose resources when needed
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- Quickly and easily scale based on demand
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- **Measured service:**
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- Usage is measured, users pay correctly for what they have used
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### Six Advantages of Cloud Computing
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- **Trade capital expense (CAPEX) for operational expense (OPEX)**
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- Pay On-Demand: don’t own hardware
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- Reduced Total Cost of Ownership (TCO) & Operational Expense (OPEX)
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- **Benefit from massive economies of scale**
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- Prices are reduced as AWS is more efficient due to large scale
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- **Stop guessing capacity**
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- Scale based on actual measured usage
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- **Increase speed and agility**
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- **Stop spending money running and maintaining data centers**
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- **Go global in minutes:** leverage the AWS global infrastructure
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### Problems solved by the Cloud
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- **Flexibility:** change resource types when needed
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- **Cost-Effectiveness:** pay as you go, for what you use
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- **Scalability:** accommodate larger loads by making hardware stronger or adding additional nodes
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- **Elasticity:** ability to scale out and scale-in when needed
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- **High-availability and fault-tolerance:** build across data centers
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- **Agility:** rapidly develop, test and launch software applications
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### Types of Cloud Computing
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- **Infrastructure as a Service (IaaS)**
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- Provide building blocks for cloud IT
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- Provides networking, computers, data storage space
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- Highest level of flexibility
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- Easy parallel with traditional on-premises IT
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- **Platform as a Service (PaaS)**
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- Removes the need for your organization to manage the underlying infrastructure
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- Focus on the deployment and management of your applications
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- **Software as a Service (SaaS)**
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- Completed product that is run and managed by the service provider
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### Example of Cloud Computing Types
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- **Infrastructure as a Service:**
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- Amazon EC2 (on AWS)
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- GCP, Azure, Rackspace, Digital Ocean, Linode
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- Platform as a Service:
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- Elastic Beanstalk (on AWS)
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- Heroku, Google App Engine (GCP), Windows Azure (Microsoft)
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- Software as a Service:
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- Many AWS services (ex: Rekognition for Machine Learning)
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- Google Apps (Gmail), Dropbox, Zoom
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### Pricing of the Cloud – Quick Overview
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- AWS has 3 pricing fundamentals, following the pay-as-you-go pricing model
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- **Compute:**
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- Pay for compute time
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- **Storage:**
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- Pay for data stored in the Cloud
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- **Data transfer OUT of the Cloud:**
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- Data transfer IN is free
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- Solves the expensive issue of traditional IT
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### AWS Cloud Use Cases
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- AWS enables you to build sophisticated, scalable applications
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- Applicable to a diverse set of industries
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- Use cases include
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- Enterprise IT, Backup & Storage, Big Data analytics
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- Website hosting, Mobile & Social Apps
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- Gaming
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## AWS Global Infrastructure
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- AWS Regions
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- AWS Availability Zones
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- AWS Data Centers
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- AWS Edge Locations / Points of Presence
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- <https://infrastructure.aws/>
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### AWS Regions
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- AWS has Regions all around the world
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- Names can be us-east-1, eu-west-3…
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- A region is a **cluster of data centers**
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- **Most AWS services are region-scoped**
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### How to choose an AWS Region?
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If you need to launch a new application, where should you do it?
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- **Compliance with data governance and legal requirements:** data never leaves a region without your explicit permission
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- **Proximity to customers:** reduced latency
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- **Available services within a Region:** new services and new features aren’t available in every Region
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- **Pricing:** pricing varies region to region and is transparent in the service pricing page
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### AWS Availability Zones
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- Each region has many availability zones (usually 3, min is 2, max is 6). Example:
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- ap-southeast-2a
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- ap-southeast-2b
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- ap-southeast-2c
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- Each availability zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity
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- They’re separate from each other, so that they’re isolated from disasters
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- They’re connected with high bandwidth, ultra-low latency networking
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### AWS Points of Presence (Edge Locations)
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- Amazon has 216 Points of Presence (205 Edge Locations & 11 Regional Caches) in 84 cities across 42 countries
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- Content is delivered to end users with lower latency
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## Tour of the AWS Console
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- **AWS has Global Services:**
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- Identity and Access Management (IAM)
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- Route 53 (DNS service)
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- CloudFront (Content Delivery Network)
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- WAF (Web Application Firewall)
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- **Most AWS services are Region-scoped:**
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- Amazon EC2 (Infrastructure as a Service)
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- Elastic Beanstalk (Platform as a Service)
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- Lambda (Function as a Service)
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- Rekognition (Software as a Service)
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- **Region Table:** <https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services>
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## Shared Responsibility Model
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- CUSTOMER = RESPONSIBILITY FOR THE SECURITY **IN** THE CLOUD
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- AWS = RESPONSIBILITY FOR THE SECURITY **OF** THE CLOUD
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* * *
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[<img align="center" src="../images/back-arrow.png" height="20" width="20"/> Index](../README.md) [IAM: Identity Access & Management <img align="center" src="../images/forward-arrow.png" height="20" width="20"/>](./iam.md)
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