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03-cloud-computing-introduction.md

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Cloud Computing Introduction

5 Characteristics of the Cloud

  1. On-Demand Self Service:
    • Ability to provision capabilities (storage, database, network, computing, security, etc.) for your product/service by user self as needed, "without requiring humen interation".
    • No need to visit vendor.
    • No need to contact support and get your requirement get done.
  2. Broad Network Access:
    • Ability to use & manage capablities (storage, database, network, computing, security, etc.) over the "network" using "standard machanisams" like http, https, ssh, ftp, vpn, etc.
    • No need of a private link to access your resources.
    • No need to visit your vendor to access your resources.
  3. Resource Pooling:
    • Resources/capabilities (database, storage, network bandwith) are pooled in large scale.
    • Serve multiple consumers in a multi tenant way, while allocating & disallocating resources according to their demand.
    • Eliminates the sense of actual location of physical hardware so that consumers don't have a control or knowladge on them.
    • Harware & their locations becomes virtual things to consumers.
    • Consumers won't be setting up hardware & maintaining them.
    • For consumers, capacity of the capabilities are limitless.
  4. Rapid Elasticity:
    • Provisioning of capabilities (database, storage, computing, networking) should get increased & decreased rapidly (elastically) based on the realtime demand of the resources.
    • To consumer ability to provision the capabilities should appear as unlimited.
  5. Measured Service: Usage of the consumers' resources should be able to monitred, controlled, reported & billed. (Pay for what you consume)

Types of Clouds

  • Public Cloud: Should satisfy the 5 characteristics of the Cloud & available to general public (Ex: AWS, Azure, Google Cloud)
  • Private Cloud: Should satisfy the 5 characteristics of the Cloud but only dedicated to consumer's business and runs "on premises"
  • Multi Cloud: Cloud solution that utilizes multiple public clouds of different cloud vendors in one solution. (Ex: AWS + Azure)
  • Hybrid Cloud: Cloud solution that utilize public cloud and private cloud togather. (Not public cloud + on premises resources)

Cloud Service Modules (XAAS)

There is infrastructure stacks when we build an application/service. There are 5 different types of modules of infrastructure stacks.

  1. On-Premises
    • Application
    • Data
    • Runtime
    • Container
    • OS
    • Virtualization
    • Servers
    • Infrastructure
    • Facility
  2. Data Center Hosted
    • Unit of Consumption: Facility
    • Available layers
      • Application
      • Data
      • Runtime
      • Container
      • OS
      • Virtualization
      • Servers
      • Infrastructure
      • Facility
  3. IAAS (Infrastructure as a Service)
    • Ex: AWS EC2
    • Unit of Consumption: Virtual Machine
    • Available layers
      • Application
      • Data
      • Runtime
      • Container
      • OS
      • Virtualization (Consumed)
      • Servers
      • Infrastructure
      • Facility
  4. PAAS (Platform as a Service)
    • Ex: Running python code on Cloud
    • Unit of Consumption: Runtime Environment
    • Available layers
      • Application
      • Data
      • Runtime (Consumed)
      • Container
      • OS
      • Virtualization
      • Servers
      • Infrastructure
      • Facility
  5. SAAS (Software as a Service)
    • Ex: Office 365, Figma, etc.
    • Unit of Consumption: Software
    • Available layers
      • Application (Consumed)
      • Data
      • Runtime
      • Container
      • OS
      • Virtualization
      • Servers
      • Infrastructure
      • Facility