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
Public Cloud (Cloud)
Private Cloud (On-Premise)
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.
Let's Summarize
| Attribute | Public Cloud | Private Cloud | Hybrid Cloud |
|---|---|---|---|
| Definition | A cloud-based application fully deployed in the cloud with shared resources among multiple users and organizations. | Cloud offering dedicated to a single organization, hosted on-premise or in a third-party data center using a virtualization layer. | Combination of public and private cloud infrastructure, offering both on-premises and cloud resources. |
| Ownership | All hardware, software, and supporting infrastructure are owned and managed by the cloud provider. | Managed and owned by the organization itself. | Public Cloud owned by providers, Private Cloud owned by organizations. |
| Accessibility | Publicly accessible by multiple users and organizations over the Internet. | Restricted access, limited to a specific organization. | Accessible to multiple users and organizations. |
| Scalability | Highly scalable, resources can be easily scaled based on demand. | Scalability depends on the organization's infrastructure. | Scalability achieved by leveraging both environments. |
| Cost | Pay-as-you-go model, cost-efficient for start-ups and small businesses. | Higher upfront costs and maintenance expenses. | Costs vary depending on the mix of public and private usage. |
| Advantages | Lower costs, no maintenance, near-unlimited scalability, high reliability. | Addresses security and privacy concerns, more control over resources. | Utilizes best of public cloud scalability while maintaining security controls. |
| Examples | Amazon Web Services (AWS), Microsoft Azure, Google Cloud. | Open Stack, Azure Stack. | AWS Outposts, Microsoft Azure Hybrid Cloud, Google Anthos. |
| Common Use Cases | Applications fully in the cloud, cost-efficient scalability. | Legacy applications and regulatory compliance. | Data center extension, VMware Cloud on AWS. |
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