AWS CCP Study Note

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Cloud Concepts

Cloud Service Provider (CSP)

• the company which provides multiple cloud services
• cloud services can be chained together to create cloud architecture
• cloud services are accessible via Single Unified API
• cloud services are metered billing based on usage
• rich monitoring built in
• have an infrastructure as a Service (IaaS) offering

  Landscape

• T1: AWS, Azure, Google Cloud Platform (GCP), Alibaba Cloud
• T2: IBM Cloud, Oracle Cloud, Rackspace (OpenStack)
• T3: Vultr, Digital Ocean, Linode

  Common Cloud Service

• AWS has over 200+ cloud services
• The term “cloud computing” refer to all categories of cloud services

  Four Core

• Compute: virtual computer for running application, programs and code
• Networking: virtual network that define internet connections or network isolation between services or outbound to the internet
  • ex. VPC Private Cloud Network
• Storage: virtual hard-drive that store files
• Databases: virtual database that storing reporting data or a database for general purpose web-application

Evolution of Computing

Dedicated

• a physical server wholly utilized by a single customer
• will overpay for an underutilized server
• cannot vertical scale, need a manual migration
• replacing server is very difficult
• limited by the host OS
• multiple apps might conflict in resource sharing
• it’s guarantee of security, privacy, and full utility of underlying resources

  VMs

• can run multiple Virtual Machines on one machine
• Hypervisor is the software layer for running VMs
• pay for a fraction of the server
• will overpay for an underutilized Virtual Machine
• limited by the guest OS
• multiple apps on a single VM can result in conflicts in resource sharing
• easy to export or import images for migration
• easy to vertical of horizontally scale

  Containers

• VM running multiple containers
• Docker Deamon is the layer allow to run multiple containers
• containers share the same underlaying OS so they are more efficient than multiple VMs
• multiple apps can run side by side without being limited to the same OS requirements and will not cause conflicts during resource sharing

  Functions

• are managed VMs running managed containers
• known as Serverless Compute
• user upload the code, choose the amount of memory and duration
• very cost-effective, only pay for the time code is running, VMs only run when there is code to be executed
• cold starts is a side-effect of this startup

Types of Cloud computing

Software as a Service (SaaS)

• for customers
• a product is run and managed by the service provider
• ex. salesforce, office365, gmail

  Platform as a Service (PaaS)

• for developers
• Focus on the deployment and management of the apps
• ex. Heroku, Google App Engine

  Infrastructure as a Service (IaaS)

• for admins
• the basic building blocks for cloud IT.
• provide access to networking features, computers, and data storage space
• ex. aws, Azure

Cloud Computing Deployment Models

Public Cloud

• everything is built on the CSP
• is known as Cloud-Native or Cloud First
• used by start up company, or small enough to make the leap from VPS to CSP
  • ex. Dropbox, Workspace

    Private Cloud

• everything built on company’s datacenters
• also known as On-Premise
• the cloud could be OpenStack
• organization that cannot run on cloud due to strict regulatory compliance or the sheer size of their organizaiton
  • ex. public sector like government, super sensitive data like hospitals, large enterprice with heavy regulation like Insurance Companies

    Hybrid

• use both On-Premise and CSP
• used by the company started with their own datacenter, cannot fully move to cloud due to effort of migration or security compliance
  • ex. banks, FinTech, large prefessional service providers, lagacy on-premise

    Cross-Cloud

• using multiple CSP
• not same as hybrid

The Benefits of Cloud