Infrastructure as a Service (IaaS)
IaaS provides fundamental computing resources like storage, networking, and virtual machines over the internet. Users manage the operating system, middleware, and applications, while the provider manages the underlying physical infrastructure.
Infrastructure as a Service (IaaS) is a cloud computing service model that offers essential computing resources on demand, typically over the internet. These resources include virtualized compute (e.g., virtual machines), storage (e.g., block or object storage), and networking capabilities (e.g., virtual networks, load balancers). The core technical mechanic involves abstracting physical hardware into virtualized components, allowing for scalable and flexible resource allocation.
Unlike Platform as a Service (PaaS) or Software as a Service (SaaS), IaaS provides the lowest level of abstraction in cloud computing. The responsibility for managing the operating system, middleware, runtime environments, and applications rests with the customer. The IaaS provider is responsible for the maintenance, management, and control of the physical infrastructure (servers, storage hardware, networking hardware) and the virtualization layer.
Key trade-offs in IaaS revolve around control versus management overhead. Customers gain significant control over their computing environment, enabling customization and compliance with specific requirements. However, this control comes with the responsibility of managing and securing the entire software stack above the hypervisor. Failure modes can include misconfigurations by the customer leading to security vulnerabilities or performance issues, or underlying hardware failures managed by the provider impacting service availability.
Systemic constraints are primarily related to network [latency](/en/terms/network-latency) and bandwidth, which directly impact the performance of applications hosted on IaaS. Additionally, vendor lock-in can be a concern, as migrating complex IaaS deployments between providers can be challenging due to differences in APIs, networking configurations, and supported services.
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Center["Infrastructure as a Service (IaaS)"]:::main
Rel_saas_software_as_a_service["saas-software-as-a-service"]:::related -.-> Center
click Rel_saas_software_as_a_service "/terms/saas-software-as-a-service"
Rel_cloud_computing["cloud-computing"]:::related -.-> Center
click Rel_cloud_computing "/terms/cloud-computing"
Rel_data_mining["data-mining"]:::related -.-> Center
click Rel_data_mining "/terms/data-mining"
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❓ Frequently Asked Questions
What is the primary difference between IaaS and PaaS?
IaaS provides virtualized computing resources (VMs, storage, networks) where the customer manages the OS and above. PaaS abstracts the OS and middleware, allowing customers to focus solely on application development and deployment.
What responsibilities does the customer have in an IaaS model?
The customer is responsible for managing the operating system, middleware, runtime, data, and applications. This includes patching, security configurations, and application-level performance tuning.
What are the benefits of using IaaS?
IaaS offers high flexibility and control over the IT infrastructure, scalability on demand, and cost savings by avoiding upfront capital expenditure on physical hardware.