📖 What is Infrastructure as a Service (IaaS)?
Infrastructure as a Service (IaaS) delivers fundamental computing infrastructure—virtual machines, storage, networks, and operating systems—over the internet on a pay-as-you-go basis. It provides maximum flexibility and control, allowing users to manage the OS, middleware, and applications.
"IaaS provides the highest level of control among cloud service models. Remember that with IaaS, you are responsible for managing the operating system and everything above it. Azure Virtual Machines, Virtual Networks, and Azure Storage are core IaaS components; understand their roles."
📚 Certification: Microsoft Azure Fundamentals (AZ-900)
🔑 What are the Key Concepts of Infrastructure as a Service (IaaS)?
- ▸ IaaS gives you control over the operating system, middleware, and applications, unlike PaaS or SaaS which abstract these layers.
- ▸ Azure Virtual Machines are a core IaaS offering, allowing you to deploy and manage virtualized servers in the cloud.
- ▸ With IaaS, you are responsible for patching, updating, and securing the OS and all software installed on the virtual machines.
- ▸ Pay-as-you-go pricing means you only pay for the resources you consume, offering cost savings compared to on-premises infrastructure.
- ▸ IaaS provides scalability and flexibility, allowing you to quickly adjust resources to meet changing demands.
🎯 How does Infrastructure as a Service (IaaS) appear on the AZ-900 Exam?
You may be asked to identify which cloud service model (IaaS, PaaS, SaaS) is best suited for a company wanting full control over their application stack and OS.
A scenario might describe a business migrating an existing on-premises application to Azure – determine which service allows them to lift-and-shift with minimal changes.
Expect questions about the shared responsibility model, specifically identifying which components are managed by Microsoft and which are managed by the customer in an IaaS environment.
❓ Frequently Asked Questions
What's the difference between IaaS and PaaS in terms of management responsibility?
With IaaS, you manage the OS and everything above it. PaaS abstracts the OS and middleware, letting Azure manage those layers, so you focus on your application code.
Can I use my existing on-premises licenses with Azure IaaS?
Potentially, through Azure Hybrid Benefit. This allows you to use your Windows Server and SQL Server licenses in Azure, reducing IaaS costs. Check license compatibility.
What are some common use cases for IaaS?
IaaS is ideal for test/dev environments, website hosting, storage, backup and disaster recovery, and extending on-premises datacenters. It's a flexible solution for many workloads.