Lec 03: Cloud Platforms, AWS Intro

Lec 03: Cloud Platforms, AWS Intro

Cloud platforms

Software as a Service (SaaS)

• CSP(Cloud Service Provider) provides an entire application
• Customer don't need to install and run the app on their computer
• CSP manages everything
• ex) Google Docs, Gmail

Platform as a Service (PaaS)

• CSP exposes a set of tools (a platform) which allow users to create SaaS applications
• SaaS application runs on CSP's infrastructure
• CSP manages underlying hardware and requirements <-> User manages applications and data
• ex) Google App Engine, Microsoft Azure

Infrastructure as a Service (IaaS)

• CSP rents servers and storage to customers
  • use virtualization technology to share each server for multiple customers
  • can create virtual machine
• User has access to standard OS environment and can install and configure all the layers above it -> managing applications, data, runtime, middleware, os
• ex) AWS EC2

Cloud deployment models

Public cloud

• open to anyone, commercial service

Community cloud

• shared by several similar organizations

Private cloud

• shared within a single organization

Amazon Web Service

AWS offers many cloud services that you can use in combinations tailored to your business or organizational needs

 

Why AWS?

• AWS is PaaS/IaaS with a broad menu of choices -> there is no common standard

Regions

• resources on AWS split into geographic regions except for S3 -> only S3 is global
• priced differently, simple latency
• each regions have multiple Availability Zones: Zones within a region networked with low-latency connections = Clusters

Interacting with AWS

• AWS Management Console: fastest way to get started with AWS, nothing to install
• AWS Command Line Interface (CLI): text-based tool you install on your computer, manages multiple AWS services
• Software Development Kits (SDKs): easiest way to write applications that manage AWS
• Query APIs: low-level APIs, call by using HTTP requests

AWS EC2

Elastic Compute Cloud (EC2)

• virtual machines running on a hypervisor
• virtual machines based on Amazon Machine Image (AMI), Instance type
• IaaS : rent a server

Prefix

• t#: the cheapest one, general purpose
• c#: compute cptimized
• m#, r#: memory optimized
• p#, f#: accelerated computing
• h#, i#, d#: storage optimized
  where # means generation number (the bigger, the newer)

Suffix

• no suffix: Intel Xeon series
• -a: AMD EPYC series (cheaper then Intel Xeon)
• -g: ARM Neoverse series (cheapest one)
• -d: NVMe storage

Levels

• namno, micro, small, medium, large, xlarge, 2xlarge ...
• metal: bare-metal server

Pricing

• On-demand, Spot instance, Reserved

Security

• Security Group: firewall, instance is not accessible by default
• Configure ssh access: generate public/private key pairs

Elastic IP

• EC2 instance gets assigned a dynamic IP
• possible to assign a static IP (= Elastic IP) -> belongs to AWS account, can be associated with an instance
• 1 per instance is free