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Cloud Concepts

What is cloud computing?

  • Delivery of computing services over the internet, enabling faster innovation, flexible resources, and economies of scale.

Cloud Models:

  • Public Cloud:

    • Owned by cloud services or hosting provider.
    • Provides resources and services to multiple organizations and users.
    • Accessed via secure network connection (typically over the internet).

  • Private Cloud:

    • Organizations create a cloud environment in their datacenter.
    • Organization is responsible for operating the services they provide.
    • Does not provide access to users outside of the organization.

  • Hybrid Cloud:

    • Combines Public and Private clouds to allow applications to run in the most appropriate location.

  • Cloud Models At A Glance:

    Public Cloud Private Cloud Hybrid Cloud
    No capital expenditures to scale up. Hardware must be purchased for start-up and maintenance. Provides the most flexibility.
    Applications can be quickly provisioned and deprovisioned. Organizations have complete control over resources and security. Organizations determine where to run their applications.
    Organizations pay only for what they use. Organizations are responsible for hardware maintenance and updates. Organizations control security, compliance, or legal requirements.

Cloud Benefits & Considerations:

  • Benefits:

    • Agility is the ability to rapidly develop, test and launch software applications.
    • Elasticity is the ability to quickly increase or decrease computing power and resources.
    • Fault Tolerance is the ability of a system to continue operating despite failures or malfunctions.
    • High availability is a quality of computing infrastructure that allows it to continue functioning, even when some of its components fail.
    • Predictive cost considerations as cloud uses consumption-based pricing model.
    • Reliability is the possibility to recover from failures at any scale and ensure that workloads of your cloud apps are available.
    • Scalability refers to scaling out or scaling up cloud resources.

  • Considerations:

    • Capital Expediture (CapEx):
      • Money spent by a business or organization on acquiring or maintaining fixed assets, such as land, buildings, and equipment.
      • Large upfront investments.
    • Operational Expediture (OpEx):
      • An ongoing cost for running a product, business, or system on a day-to-day basis, including annual costs.
    • Consumption-based Pricing Model (PAYG):
      • End users only pay for the resources that they use.
      • Better cost prediction.

Cloud Services:

  • Infrastructure As A Service (IaaS):

    • Build pay-as-you-go IT infrastructure by renting servers, virtual machines, storage, networks, and operating systems from a cloud provider.

  • Platform As A Service (PaaS):

    • Provides environment for building, testing, and deploying software applications; without focusing on managing underlying infrastructure.

  • Software As A Service (SaaS):

    • Users connect to and use cloud-based apps over the internet.

  • Cloud Services At A Glance:

    IaaS PaaS SaaS
    The most flexible cloud service. Focus on application development. Pay-as-you-go pricing model.
    You configure and manage the hardware for your application. Platform management is handled by the cloud provider. Users pay for the software they use on a subscription model.

  • Serverless Computing:

    • Customers don’t have any servers.
    • The serverless cloud service provider automatically provisions, scales, and manages the infrastructure required to run the code.

  • Shared Responsibility Model:

    • Cloud security is a shared responsibility of both cloud providers and customers.
    • Cloud provider is responsible for Securing the Cloud.
    • Cloud custome is responsible for Securing what's in the Cloud.