Cloud Computing

• Cloud Computing
  • Traditional IT
  • What Is Cloud Computing
  • Deployment Models of the Cloud
  • Five Characteristics of Cloud Computing
  • Six Advantages of Cloud Computing
  • Types of Cloud Computing
  • Pricing of the Cloud
  • AWS Regions Breakdown

Traditional IT

• Terminology:
  • Network: cables, routers and servers connected with each other.
  • Router: A networking device that forwards data packets between computer networks. They know where to send packets on the internet.
  • Switch: Takes a packet and send it to the correct server / client on the network.
• How Websites Work:
  • Client uses a network to get access to a server
  • The network routes our requests to the server which can then send back through the server what we want.
  • Both client and server have IP addresses, this is how the network knows how to do direct the traffic.
• What is in a Server:
  • CPU: Computations
  • RAM: Memory
  • Storage: Data
  • Database: Structured Storage
  • Network: Routers, switches, DNS server
• Avoids a lot of traditional issues that come with a traditional approach of having a data center.
  • Don't need to pay for power, physical security, or people to watch over or provide maintenance.
  • Don't need to worry about disasters like fires or earthquakes that could damage the servers.

What Is Cloud Computing

• On-demand delivery of computing power, database storage, apps, and other IT resources.
• Pay as you go pricing.
• You can provision exactly the right type and size of computing resources you need.
• You can access as many resources as you need instantly.
• Simple way to access servers, storage, databases and application services

Deployment Models of the Cloud

Private Cloud:

• Cloud services used by a single org, not exposed to public.
• Complete control.
• Security for sensitive apps.
• Meets specific business needs.

Public Cloud:

• Cloud resources owned and operated by a third-party over the internet.
• Six advantages of cloud computing.

Hybrid Cloud:

• Keep some servers on premises and extend some capabilities to the cloud.
• Control over sensitive assets in your private infrastructure.
• Flexibility and cost-effectiveness of the public cloud.

Five Characteristics of Cloud Computing

• On-demand self service.
  • Can provision resources and use them without interacting with the service provider.
• Broad Network access.
  • Resources available over the network, and can be accessed by diverse client platforms.
• Multi-tenancy and resource pooling.
  • Multiple customers can share infrastructure and applications with security and privacy.
  • Multiple customers are serviced from the same physical resources.
• Rapid elasticity and scalability.
  • Automatically acquire and dispose resources quickly.
  • Easily scalable on demand.
• Measured service.
  • Usage is measured, users pay for exactly what they use.

Six Advantages of Cloud Computing

• Trade capital expense (CAPEX) for operational expense (OPEX)
  • Pay On-Demand
  • Reduced total cost of ownership and operational expense.
• Benefit from massive economies of scale.
  • Prices are reduced as AWS is more efficient due to large scale.
• Stop guessing capacity.
  • Scale is based on actual measured usage.
• Increase speed and agility.
• Stop spending money running and maintaining data centers
• Go global in minutes

Types of Cloud Computing

• Infrastructure as a Service (IaaS)
  • Provide building blocks for cloud IT.
  • Provides networking, computers, data storage space.
  • Highest level of flexibility.
  • Easy parallel with traditional on-premises IT.
  • On AWS this is Amazon EC2
• Platform as a Service (PaaS)
  • Removes need for the org to manage underlying infrastructure.
  • Focuses on deploying and managing applications
  • On AWS this is Elastic Beanstalk
• Software as a Service (SaaS)
  • Completed product that is run and managed by the service provider.
  • Many AWS services exist for different applications (example: Rekognition for Machine Learning)

Pricing of the Cloud

• 3 Pricing Fundamentals:
  • Computing: Pay for compute time.
  • Storage: Pay for data stored in the cloud.
  • Data Transfer OUT of the cloud: Data transfer IN is free!

AWS Regions Breakdown

• AWS Regions:
  • AWS has regions all around the world.
  • Names can be stuff like us-east-1, eu-west-3,...
  • A region is a cluster of data centers.
  • Most AWS services are region scoped.
  • Factors to help you choose a region:
    • Compliance with data governance and legal requirements: data never leaves a region without your explicit permission.
    • Proximity to customers: latency.
    • Available services within a region: ner services and features aren't available in every region.
    • Pricing: pricing can vary from region to region.
• AWS Availability Zones:
  • Each region has many availability zones (usually 3, min is 3 and max is 6)
  • Region: ap-southeast-2 -> ap-southeast-2a, ap-southeast-2b, ap-southeast-2c.
  • Each availability zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity.
  • They're separate from each other so they're isolated from disasters.
  • Connected with high bandwidth and ultra low latency between them.
• AWS Points of Presence:
  • Content is delivered to end users with lower latency.