Lec 2: AWS Intro Flashcards
(33 cards)
What is the core technique of cloud computing?
Virtualization
What if the machine needs to be shut down for maintenance?
Virtual machine live migration: Alice can migrate the running VMs to different physical machines without interrupting any customers.
What should Alice do?
Suppose Alice has a machine with 16 CPUs and 64 GB of memory. There are three customers:
Bob wants a machine with 8 CPUs and 32 GB of memory
Charlie wants a machine with 8 CPUs and 32 GB of memory
Daniel wants a machine with 4 CPUs and 8 GB of memory
Virtualization: Alice installs a virtual machine monitor (VMM) and provides each customer with a guest OS/virtual machine (VM) and the requested resources as vCPUs and guest physical memory.
Ex: Bob will be assigned with 8 vCPUs and 32GB of guest physical memory
Can customers access other customers data?
No because of VM isolation: One customer cannot access data of another customer
How is virtualization implemented?
-VMM (“Hypervisor”) has translation tables that map virtual (guest) memory to physical memory
Example:
VM 1 accesses memory cell #0; VMM maps this to memory cell #0
VM 2 accesses memory cell #0; VMM maps this to memory cell #300.
-VMs also time-share CPUs (a time-multiplexed manner)
Time-multiplex does not work for memory. Why?
-Memory cannot be overlapped
-Other users are not supposed to access other memory spaces
What if Alice serves more customers?
-Existing customers will be allocated less shares, thus performance will be affected
Benefits of virtualization
Flexible to cloud providers, who
-can generate VMs with different resource capabilities
-can migrate VMs if necessary (e.g., for maintenance)
-can increase load by overcommitting resources
Secure to VMs
-One VM cannot access another without permission
Convenient to customers
- Complete control over the virtual ‘hardware’ (can install their own operating systems, applications, …)
But there might be performance impacts
-Load changes in one VM may affect the performance of another VM on the same physical machine (e.g., Bob is allowed to increase his vCPUs from 8 to 16.)
Amazon: the pioneer (Timeline)
Jul 2002
Amazon Web Services launched
Mar 2006
Amazon S3 (Simple Storage Service) launched
-Proposed the ‘pay-per-use’ business model, which is now the standard in cloud computing
Aug 2006
Amazon EC2 (Elastic Compute Cloud) launched
Nov 2009
Microsoft Azure Beta launched
-Microsoft’s online services are gradually transitioning to Azure
Dec 2013
Google Compute Engine launched
What services does a cloud provide? (3 common types)
Software as a service (SaaS)
SaaS delivers fully functional software on a subscription basis.
Platform as a service (PaaS)
PaaS provides a platform and pre-configured environment for users to develop their software.
Infrastructure as a service (IaaS)
IaaS offers basic computing resources such as virtual machines, storage, and network bandwidth.
Other XaaS: anything as a service (less common)
-Desktop as a service (DaaS)
-Network as a service (NaaS)
What is SaaS? Give an example.
SaaS: Cloud provides an entire application
Email, Drive, Doc, Slides,…
Example: Google Workspace
What is PaaS? Give an example.
PaaS: Cloud provides middleware
Common Language Runtime environment
Example: Heroku
What is IaaS? Give an example.
IaaS: Cloud provides hardware resources
Virtual Machines, Virtual Memory, Virtual Disk,…
Examples: AWS Elastic Compute Cloud (EC2)
Types of cloud in terms of target customers
Public cloud: open to general public.
Example: AWS, Microsoft Azure, Google Compute Engine
Community cloud: shared by multiple organizations with common interests and requirements.
Example: Healthcare Sectors
Private cloud: exclusively used by a single organization.
Example: Google’s internal datacenter
What is XaaS cloud computing? Describe the different categories of XaaS cloud computing can provide and specific examples of each service.
Cloud computing offers a range of services, referred to as “XaaS,” which stands for “Anything as a Service.”
-Infrastructure as a Service that provides virtualized computing resources. An example is AWS EC2.
-Platform as a Service that provides a runtime environment for developers to build, deploy, and manage applications. An examples is Google App Engine or Heroku.
-Software as a Service that delivers fully functional software applications. An example is Microsoft 365 office or Google workplace.
Examples of cloud services provided by AWS
Analytics
Application Integration
AWS Cost Management
Blockchain
Business Applications
Compute
Containers
Customer Enablement
Database
Developer Tools
End User Computing
Front-end Web & Mobile
Game Development
Internet of Things
Machine Learning
Management & Governance
Media Services
Migration & Transfer
Networking & Content Delivery
Quantum Technologies
Robotics
Satellite
Security, Identity, & Compliance
Storage
AWS: the leading cloud providing a wide range of services
The services satisfy different needs of customers:
-Allowing us to design, deploy, and manage applications on the cloud, so-called application architecture.
e.g., build a web application
What is an application architecture?
It is the structural design and organization of a software application.
What are the main types of application architecture?
Monolithic architecture
Client/Server architecture
Three-tier architecture
Cloud-based serverless architecture
What is monolithic architecture? Give an example.
combines the frontend, backend, and database functionalities into a single application
e.g., wordpress: a content management system (CMS)
What is Client/Server architecture? Give an example.
an application is split into two main components:
the client, which handles the user requests, and
the server, which handles the processing of requests and data storage.
e.g., gmail
What is Three-tier architecture? Give an example.
a presentation tier (frontend),
application logic tier (backend), and
a database tier (backend)
e.g., Shopify: an e-commerce platform.
What is Cloud-based serverless architecture? Give an example.
known as Function-as-a-Service, which is a cloud computing model where the cloud provider provisions, maintains and scales applications.
e.g., AWS Lambda
Deploying a cloud application
When an application is ready, it can be deployed onto AWS via different services. What are these services?
Elastic Compute Cloud (EC2): an EC2 instance is a virtual machine that runs a Windows or Linux server. It is essentially running on Virtual Machine Monitor (VMM).
Elastic Container Service (ECS): a customized environment provided by an EC2 instance.
Describe the main steps which you would take on AWS and the decisions that would need to be made to create, configure and launch an EC2 Instance.
Sign in to the AWS management console
Navigate to EC2 Dashboard and click “Launch instance”
Select/Create names and tags
–“Name and tags”: In this step, we add a tag for the instance, e.g., Key: Name, Value: 00000000-vm. We can click the “Add new tag” button to add multiple tags as needed.
Select AMI and Instance type
–“Application and OS Images (Amazon Machine Image)”: In this step, we select an AMI that suits our requirements.
–“Instance type”: In this step, we select an appropriate instance type. (t2.micro)
Select/Create Key pair for login
–“Key pair (login)”: In this step, we can select/create a key pair (SSH key) for secure access to our first instance.
Configure network settings and storage
–Create security group: a security group is a set of firewall rules that control the network traffic for our instance.
–“Configure storage”: In this step, we specify storage volume for our instance. By default, one EBS volume is attached to the instance. We can add more EBS volumes if needed.
—-EBS setting
–“Advanced details”
—-Instance purchasing options
—-IAM: a service that allows us to manage users, groups, and permissions to securely control access to AWS resources.
Review and launch
