Comparing public, private, Hybrid and community cloud models

 1. Public cloud

a. Ownership: public cloud services are owned and operated by third party providers and resources are shared among multiple organizations.

b. Accessibility: Accessible to the general public via the Internet.

c. Scalability: Offers high scalability with on- demand resources.

d. Cost: Typically pay-as-you-go pricing model.

e. Examples: Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform(GCP).

2. Private cloud

a. Ownership: Private cloud infrastructure is dedicated to a single organization and is either managed internally or by a third-party provider.

b. Accessibility: Accessible is restricted to the organization that owns it.

c. Control: Provides greater control over security, compliance and customization.

d. Cost: Initial set up cost can be higher, but longterm costs may be lower for certain workloads.

e. Examples: VMware VCloud, OpenStack, Microsoft Azure Stack.

3. Hybrid cloud

a. Combination: Combines public and private cloud resources, allowing data and applications to be shared between them.

b. Flexibility: Offers flexibility to scale workloads between environments based on requirements

c. Data Management: Enables organizations to leverage the benefits of both public and private clouds while managing data securely.

d. Complexity: Requires careful management to ensure integration, security and data consistency.

e. Examples: AWS Outposts, Azure Hybrid and Google Anthos.

4. Community cloud

a. Shared Infrastructure: Infrastructure shared by several organizations with common concerns (e.g.,regulatory compliance, security requirements).

b. Cost sharing: Cost and resource sharing among community members.

c. Customization: Can be tailored to meet the specific needs of the community.

d. Governance: Governed by the participating organization, often with agreements on security, compliance and service level.

e. Examples: Government community clouds, health care community clouds