📖 What is IaaS (Infrastructure as a Service)?
IaaS provides on-demand access to fundamental computing resources—virtual machines, storage, networks, and operating systems—over the internet. Users manage the operating system, middleware, and applications, while the cloud provider manages the underlying infrastructure, offering flexibility and control.
"IaaS gives you the most control over your cloud resources. Remember the 'shared responsibility model': you are responsible for securing the OS and data, while Azure secures the physical infrastructure. Distinguish IaaS from PaaS and SaaS; understand what each model manages."
📚 Certification: Microsoft Azure Fundamentals (AZ-900)
🔑 What are the Key Concepts of IaaS (Infrastructure as a Service)?
- ▸ IaaS offers the highest level of control for users, allowing full management of the OS, middleware, and applications.
- ▸ The 'shared responsibility model' is crucial: Azure manages the physical infrastructure, while you manage everything above that.
- ▸ Virtual machines are a core component of IaaS, providing scalable compute resources on demand.
- ▸ IaaS is ideal for organizations wanting to migrate existing applications to the cloud without significant code changes.
- ▸ Cost management is key with IaaS; you pay for the resources you consume, requiring careful monitoring and optimization.
🎯 How does IaaS (Infrastructure as a Service) appear on the AZ-900 Exam?
You may be asked to identify which service model (IaaS, PaaS, or SaaS) best fits a scenario where a company needs complete control over the operating system and application stack.
A scenario might describe a company migrating an existing on-premises application to Azure – determine which service model would require the least application refactoring.
Expect questions about the responsibilities of the cloud provider versus the user when utilizing IaaS, focusing on security and maintenance.
❓ Frequently Asked Questions
How does IaaS differ from PaaS in terms of management overhead?
With PaaS, Azure manages the OS and middleware, reducing your management burden. IaaS requires you to handle these aspects yourself, offering greater flexibility but more responsibility.
What are some common use cases for IaaS beyond simple VM hosting?
IaaS is used for disaster recovery, test and development environments, and hosting legacy applications that are difficult to refactor for PaaS or SaaS.
If I choose IaaS, am I still responsible for patching the OS on my virtual machines?
Yes, absolutely. Under the shared responsibility model, you are responsible for patching and maintaining the operating system and all software installed on your IaaS virtual machines.