1.2 Cloud Models

The cloud models define the deployment type of cloud resources.

• Private Cloud

  Distinct and secure environment that is built within customer’s datacenter.

  • It’s a cloud delivering services that is used by a single entity.
  • Provides greater control for the company and its IT department.
  • Greater cost, fewer benefits than public cloud.
  • Can be hosted from your onsite datacenter, or a dedicated offsite datacenter, potentially even by a third party that has a dedicated datacenter for the company.
  • Provides greater control and exclusivity i.e. full control over resources and data
  • Company is solely responsible for operating and securing services, infrastructure ,software and platform. No reliance on external assets.
  • Higher data security and operational performance.

  ### Challenges in Private:

  • Hardware cost, maintenance responsibility.

• Public Cloud

  Secure environment owned and operated by provider.

  • Owned and operated by cloud service provider, amazon, azure, oracle, etc.
  • Multi-tenant model, uses same hardware but the data is isolated.
  • Uses secure VPN connection for accessing the remote resources, for example, azure portal.
  • Deploy on demand, optimize resources, pay only for services availed.

• Hybrid Cloud

  Combination of both public and private cloud principles.

  • Security of private cloud, scalability of public cloud.
  • Flexible application hosting.
  • Sensitive data hosted in private cloud, public facing services hosted in public cloud.