Cloud Deployment Models

What is a Cloud Deployment Model?

Cloud deployment refers to:

• How you distribute your cloud computing resources such as "compute", "storage", "database" etc in terms of ownership, accessibility, and management.

• It also defines, how cloud services or infrastructure are deployed and made available to users or *organizations*

Three very popular cloud deployment models

1. Public Cloud (Cloud)

2. Private Cloud (On-Premise)

3. Hybrid Cloud (Public+Private)

Public Cloud

Definition:

• A cloud-based application is fully deployed in the cloud and all parts of the application run in the cloud.

• Applications are either created in the cloud or migrated from existing infrastructure to leverage cloud computing benefits.

Ownership:

• All hardware, software, and supporting infrastructure are owned and managed by the cloud provider.

• You share the same hardware, storage and network devices with other organizations or cloud “tenants”.

Accessibility:

• Publicly accessible by multiple users and organizations over the Internet.

Scalability:

• Highly scalable, resources can be easily scaled to meet your demanding needs.

• Cloud resources such as compute (EC2) can be dynamically increased or decreased based on demand.

Cost:

• Pay-as-you-go model: You pay for what you consume

• Cost-efficient especially for start-ups and small businesses

Advantages:

• Lower costs: no need to purchase hardware or software and you pay only for the service you use.

• No maintenance: The cloud service provider provides the maintenance.

• Near-unlimited scalability: on-demand resources are available to meet your business needs.

• High reliability: a vast network of servers ensures against failure.

Examples:

• Amazon Web Services (AWS), Microsoft Azure, Google Cloud

Private Cloud

Definition:

• Cloud Offering that is created and owned by the same organization

• Cloud offering that is dedicated to single/same organization.

• The infrastructure is provisioned on the organization's premises but may be hosted in a third-party data center. In most cases, a private cloud infrastructure is implemented and hosted in an on-premise data center using a virtualization layer

Ownership:

• Private Cloud is managed and owned by the organization itself

Accessibility:

• Restricted access, limited to a specific organization

Scalability:

• Scalability depends on the organization's infrastructure

Cost:

• Higher upfront costs and maintenance expenses

• Private Clouds are more expensive than Public Cloud due to the capital expenditure involved in building and maintaining the infrastructure.

Advantages:

• Private cloud address the security and privacy concerns raised in public cloud offerings.

Examples:

• Open Stack, Azure Stack

Hybrid Cloud

Definition:

• Hybrid Clouds combine on-premises infrastructure, or Private Cloud, with Public Cloud

• Its combination of public and private cloud infrastructure

Ownership:

• Both Public and Private Clouds are used, Private Cloud ownership lies with organizations while Cloud Providers maintain the ownership of Public Cloud

Accessibility:

• Accessible to multiple users and organizations

Scalability:

• Scalability can be achieved by leveraging both environments

Cost:

• Costs vary depending on the mix of public and private usage

Advantages:

• Make the best of Public Cloud scalability and reliability features while maintaining security controls within the organization

Examples:

• AWS Outposts, Microsoft Azure Hybrid Cloud, Google Anthos

Common Use Cases:

• you might have legacy applications that are better-maintained on-premises, or government regulations require your business to keep certain records on premises

• Data Center Extension: Extending an organization's infrastructure into the cloud while connecting cloud resources to the internal system.

• VMware Cloud on AWS: is an integrated cloud offering delivering a scalable, secure and innovative service that allows organizations to seamlessly migrate and extend their on-premises VMware vSphere-based environments to the AWS Cloud running on next-generation Amazon Elastic Compute Cloud (Amazon EC2) bare metal infrastructure.

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