What Is IaaS? Infrastructure as a Service Explained for Australian Businesses

Infrastructure as a Service (IaaS) is a cloud computing model that delivers virtualised computing resources — including servers, storage, and networking — over the internet, so businesses can build and run IT infrastructure without owning or maintaining physical hardware.

IaaS Explained: Introduction to Infrastructure as a Service in Cloud Computing

What Makes IaaS Different

The IaaS model removes the need to purchase, house, or manage physical servers. Instead, a cloud provider hosts the underlying physical infrastructure, and businesses access what they need on demand — paying only for what they use. In that sense, IaaS eliminates the single biggest barrier to enterprise-grade IT: the capital cost of hardware.

This approach has become a cornerstone of modern IT strategy. According to Gartner, the worldwide IaaS market grew 16.2% in 2023 to total USD $140 billion, reflecting how rapidly organisations are shifting away from on-premises infrastructure — and that growth accelerated to 22.5% in 2024, reaching USD $171.8 billion.

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Where IaaS Fits in the Cloud Computing Stack

IaaS is a type of cloud service that sits at the foundation of the cloud computing stack, alongside PaaS and SaaS. Each cloud service model serves a different layer:

• IaaS provides the raw infrastructure — compute, storage, networking
• PaaS provides a development platform on top of that infrastructure
• SaaS delivers fully built applications ready to use

IaaS gives organisations the most control over their environment while still offloading hardware management to the provider.

Why Australian Businesses Are Moving to IaaS

For Australian SMBs and mid-market organisations, IaaS offers a practical path to scalable IT infrastructure without the capital expenditure of building out a local server room. IaaS gives businesses immediate access to infrastructure that would otherwise take months to procure and deploy. With AWS, Microsoft Azure, and Google Cloud all operating local Australian regions (Sydney, Melbourne), latency and data residency concerns are increasingly manageable.

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How IaaS Works: Architecture and Infrastructure Components

IaaS works by virtualising physical infrastructure — servers, storage arrays, and network equipment housed in large data centres — and making those resources accessible via the internet or a private connection. Understanding how IaaS works helps organisations plan deployments more effectively and set realistic expectations around what the provider manages versus what remains the customer's responsibility.

The Three Core Layers of IaaS Architecture

The IaaS architecture typically consists of three layers that together form the cloud-based infrastructure businesses access:

1. Physical layer — The actual hardware: servers, networking switches, storage systems, and the data centre facilities that house them. This is the underlying physical infrastructure the IaaS vendor owns and operates.
2. Virtualisation layer — Hypervisor software (such as VMware, KVM, or Hyper-V) that abstracts physical resources into virtualized computing resources — virtual machines, virtual networks, and virtual storage
3. Management layer — APIs, dashboards, and automation tools that let customers provision, monitor, and configure their environment

How Provisioning Works

A business can spin up a virtual machine in minutes through a web console or API call — IaaS makes it fast to get infrastructure running without procurement delays. The service provider delivers compute, storage, and networking on demand. The customer manages everything above the hypervisor: the operating system, middleware, applications, and data.

This split is often called the shared responsibility model — a term used across AWS, Azure, and Google Cloud to define what the provider secures versus what the customer is accountable for.

Types of Infrastructure as a Service Resources and IaaS Services

To make IaaS explained in concrete terms, here are the most commonly used infrastructure as a service resources available across major IaaS platforms. IaaS platforms offer these resource categories as standard, though the specific services and pricing vary between providers. Understanding the IaaS resources available helps organisations match their infrastructure requirements to the right provider. Many IaaS providers also bundle additional managed services — such as database hosting, container orchestration, and serverless compute — on top of these core resource types.

Compute Resources

• Virtual Machines (VMs) — The most fundamental IaaS resource. AWS calls these EC2 instances; Azure calls them Virtual Machines; Google Cloud calls them Compute Engine instances. Sizes range from 1 vCPU/1GB RAM to hundreds of cores with terabytes of memory.
• Bare Metal Servers — Physical servers provisioned without a hypervisor layer, used where maximum performance or specific licensing requires direct hardware access (offered by IBM Cloud, AWS, and others)
• Auto Scaling Groups — Automatically add or remove VM instances based on traffic or load thresholds

Storage Resources

• Block Storage — Persistent disks attached to VMs (e.g., AWS EBS, Azure Managed Disks, Google Persistent Disk). Typical use: OS volumes and databases
• Object Storage — Scalable storage for unstructured data like files, backups, and media (e.g., AWS S3, Azure Blob Storage, Google Cloud Storage). AWS S3 alone stores over 300 trillion objects as of 2024.
• File Storage — Shared file systems mountable by multiple VMs (e.g., AWS EFS, Azure Files)

Networking Resources

• Virtual Private Cloud (VPC) — An isolated network environment within the provider's infrastructure, with full control over IP ranges, subnets, and routing
• Load Balancers — Distribute incoming traffic across multiple VM instances to ensure availability and performance
• Content Delivery Networks (CDN) — Serve content from edge locations closer to end users (e.g., AWS CloudFront, Azure CDN)
• Dedicated Connectivity — Private network connections between on-premises infrastructure and the cloud (AWS Direct Connect, Azure ExpressRoute)

Other IaaS Infrastructure

• Managed Firewalls and Security Groups — Network-level traffic control
• DNS Management — Route traffic to resources by domain name
• Snapshots and Backups — Point-in-time copies of disks and configurations
  
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The Top Three IaaS Vendors by Market Share

According to Gartner's 2024 IaaS market share report, three IaaS vendors account for the majority of global revenue. IaaS vendors offer a range of cloud infrastructure resources at different price points, but these three dominate due to their breadth of services, global regions, and enterprise support:

1. Amazon Web Services (AWS) — The market leader, holding 39% share in 2023. AWS offers the broadest catalogue of IaaS services and has operated in the Asia Pacific (Sydney) region since 2012. Services include EC2, S3, VPC, RDS, and hundreds more.
2. Microsoft Azure — Second at approximately 23% market share. Azure is particularly strong in enterprise environments due to deep integration with Microsoft 365, Active Directory, and hybrid cloud tools. Azure operates data centres in both Sydney and Melbourne.
3. Google Cloud Platform (GCP) — Third at approximately 8% share, with strengths in data analytics, Kubernetes (which Google originally developed), and AI/ML infrastructure. GCP's Sydney region serves Australian customers.

Other Providers Worth Considering

Beyond the top three, several other providers address specific infrastructure needs:

• IBM Cloud — Strong in hybrid cloud and regulated industries (financial services, healthcare), with bare metal server options
• Oracle Cloud Infrastructure (OCI) — Competitive pricing for database workloads, especially for businesses already running Oracle software
• Alibaba Cloud — The leading IaaS provider in Asia Pacific outside of the big three; relevant for businesses with operations across Southeast Asia
• Rackspace — A managed cloud provider offering fully managed infrastructure built on top of AWS, Azure, and GCP with added management services

How to Choose IaaS: Selecting the Right Provider

When deciding how to choose IaaS, the right provider depends on workload type, existing technology stack, compliance requirements, and budget. Many organisations run a multi-cloud strategy — using AWS for compute-heavy workloads, Azure for Microsoft-integrated services, and GCP for analytics — rather than committing to a single vendor.

IaaS vs PaaS and SaaS: Understanding Cloud Service Models

Understanding the difference between IaaS vs PaaS and SaaS, and where each cloud service model fits, helps businesses match their infrastructure needs to the right solution.

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When to Use IaaS Over PaaS or SaaS

IaaS suits organisations that need full control over their environment — for example, businesses running legacy applications that can't be easily containerised, or those with specific OS and configuration requirements. It's also the natural starting point for lift-and-shift migrations, where existing on-premises workloads are moved to the cloud with minimal modification. IaaS allows organisations to replicate their existing environment in the public cloud without redesigning applications from scratch.

IaaS also makes sense when workloads in the cloud need to behave identically to how they run on-premises — common in regulated industries where change management processes are strict. In these scenarios, IaaS allows organisations to move to the cloud at their own pace, retaining control over their environment throughout.

Benefits of IaaS and Key Advantages of IaaS for Business

IaaS is a cloud computing model that provides on-demand access to infrastructure resources, and the advantages of IaaS become clear when set against the cost and rigidity of traditional on-premises infrastructure. Learn about infrastructure as a service's practical impact below.

Cost Efficiency

IaaS converts capital expenditure (buying servers) into operational expenditure (paying for what you use). Businesses avoid the upfront cost of hardware, the ongoing cost of maintenance, and the hidden costs of power, cooling, and physical space. AWS estimates that customers moving to their cloud see an average 31% reduction in infrastructure costs compared to on-premises equivalents, though real savings vary significantly by workload.

Scalability on Demand

Resources scale up in minutes rather than weeks. A business running a product launch or seasonal campaign can provision additional compute capacity, then release it once demand subsides — paying only for the hours used. IaaS enables this elasticity without any hardware procurement cycle, making it one of the clearest advantages of IaaS over traditional hosting.

Business Continuity and Resilience

Major IaaS providers offer 99.9% to 99.99% uptime service level agreements on their core services. Automated backups, multi-availability zone deployments, and geographic redundancy options give businesses resilience that would be difficult and expensive to replicate in a local data centre.

Access to Advanced Technology

IaaS delivers access to infrastructure that would otherwise require significant capital investment — GPUs for AI workloads, specialised networking hardware, managed database engines — available immediately without procurement delays. IaaS supports rapid adoption of new technologies without the friction of hardware procurement.

Speed to Market

Development teams can spin up testing and staging environments on demand, experiment with configurations, and tear them down without impacting production systems. This flexibility accelerates product development and reduces risk.

Security Considerations for IaaS

Security in IaaS environments is a shared responsibility — and misunderstanding that boundary is one of the most common causes of cloud security incidents.

The Shared Responsibility Model in Practice

The cloud provider secures the physical data centre, the hypervisor layer, and the global cloud computing infrastructure. The customer is responsible for securing everything above that line:

• Operating system patching and hardening
• Identity and access management (IAM) configuration
• Network security group and firewall rules
• Data encryption at rest and in transit
• Application-level security

The majority of cloud security breaches are caused by customer-side misconfigurations, not provider-side failures. A 2024 Gartner report projected that through 2025, 99% of cloud security failures would be the customer's fault — primarily through misconfigured access controls and insufficient identity management.

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Identity and Access Management (IAM)

IAM is the first line of defence in any IaaS environment. Infrastructure that supports multiple teams or applications needs strict access boundaries to prevent lateral movement if a credential is compromised.

• Apply the principle of least privilege: every user, service, and application should have only the minimum permissions required
• Use multi-factor authentication (MFA) on all administrative accounts without exception
• Rotate access keys and credentials regularly; avoid storing long-lived credentials in application code

Network Security

• Use Virtual Private Clouds (VPCs) to isolate workloads from each other and from the public internet
• Restrict inbound and outbound traffic with security groups and network ACLs
• Use private subnets for databases and back-end services that don't need direct internet access
• Enable VPC flow logs to capture network traffic for monitoring and forensics

Data Protection

• Encrypt all data at rest using provider-managed or customer-managed encryption keys (AWS KMS, Azure Key Vault)
• Enforce TLS/HTTPS for all data in transit
• Implement regular automated backups with tested restoration procedures
• Classify data and apply appropriate controls based on sensitivity

Monitoring and Visibility

• Enable cloud-native logging tools (AWS CloudTrail, Azure Monitor, GCP Cloud Audit Logs) to record all API calls and administrative actions
• Set up alerts for unusual activity: new IAM users, changes to security group rules, access from unexpected regions
• Consider a Security Information and Event Management (SIEM) solution for centralised log analysis, especially in regulated industries

Compliance Considerations for Australian Businesses

Australian businesses handling personal information must comply with the Privacy Act 1988 and the Australian Privacy Principles (APPs), administered by the Office of the Australian Information Commissioner (OAIC). Businesses in healthcare must align with the My Health Records Act 2012; those in financial services with APRA CPS 234, the prudential standard governing information security for APRA-regulated entities. For broader cybersecurity baseline guidance, the Australian Signals Directorate's Essential Eight provides a practical starting framework for any IaaS environment. Choosing an IaaS vendor with Australian data centre regions and appropriate compliance certifications (ISO 27001, SOC 2 Type II) helps meet these obligations.

Cloud Migration and IaaS: Strategy and Implementation

What Cloud Migration Means for IaaS

Cloud migration is the process of moving workloads, applications, and data from on-premises infrastructure into a cloud environment — typically onto an IaaS platform. It's not a single action but a programme of work that can take months or years depending on the complexity of existing systems. IaaS helps organisations tackle migration incrementally, reducing risk by moving workloads one at a time rather than all at once.

The 7 Rs of Cloud Migration

The 7 Rs framework, developed from early AWS migration methodology, provides a decision model for each workload:

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The Four Phases of a Cloud Migration

Phase 1: Assessment

Inventory all existing workloads, map dependencies between systems, and classify each application against the 7 Rs framework. Identify infrastructure requirements, compliance constraints, data residency obligations, and integration points.

Phase 2: Planning

Define the migration sequence (typically starting with lower-risk, non-critical workloads), select the IaaS provider and region, design the target network architecture, and establish security and governance baselines.

Phase 3: Migration

Execute migrations in waves, starting with the least complex workloads. Validate functionality, performance, and security after each migration before proceeding. Maintain rollback capability until each workload is fully validated.

Phase 4: Optimisation

Review resource utilisation, right-size over-provisioned instances, implement cost management tools (AWS Cost Explorer, Azure Cost Management), and refine monitoring and alerting. Cloud environments should be continuously optimised — effective infrastructure management doesn't stop at go-live.

Why Cloud Migrations Fail

The most common causes of unsuccessful cloud migrations include:

• Insufficient discovery — Undocumented dependencies between systems cause failures when one application is migrated without its dependencies
• No performance baseline — Without benchmarks, it's impossible to validate that migrated workloads perform as expected
• Underestimating networking complexity — Data transfer costs and latency between on-premises and cloud systems are frequently overlooked
• Skills gaps — Cloud environments require different skills to on-premises infrastructure; teams without cloud experience often misconfigure security or over-provision resources
• Big bang approaches — Attempting to migrate everything at once dramatically increases risk; phased approaches consistently produce better outcomes

Common Use Cases for IaaS: How Businesses Use Cloud Infrastructure

IaaS is a cloud computing model that provides on-demand access to infrastructure across a wide range of scenarios. The common IaaS use cases below cover the most frequent ways Australian organisations use infrastructure in the cloud — from development environments through to disaster recovery.

Development and Testing Environments

Developers can provision complete environments on demand, run tests, and destroy the environment when done — avoiding the cost and wait of provisioning physical test servers. This is one of the most immediate and low-risk use cases for IaaS, and a common first step for organisations looking to implement IaaS before migrating production workloads.

Hosting Web Applications and APIs

IaaS provides the compute and networking infrastructure that supports web applications at any scale, with load balancers to distribute traffic and auto-scaling to handle demand spikes. An e-commerce business, for example, can scale compute capacity during peak periods like Black Friday without paying for that capacity year-round.

Disaster Recovery and Business Continuity

IaaS enables cost-effective disaster recovery by replicating workloads to a cloud environment that can be activated if the primary site fails. Traditional DR required maintaining a duplicate physical site — IaaS eliminates that ongoing cost by only paying for storage replication day-to-day, with compute spun up only in a failover event.

Data Storage and Backup

Object storage services like AWS S3 offer highly durable, low-cost storage for backups, archives, and large datasets. AWS S3 is designed for 99.999999999% (11 nines) durability — meaning it's engineered to tolerate the simultaneous loss of data across multiple facilities.

High-Performance Computing (HPC)

Research institutions, engineering firms, and financial services organisations use infrastructure to run workloads that would require significant on-premises hardware investment — from computational fluid dynamics to machine learning model training. IaaS makes it possible to access GPU and high-CPU instances on demand, without committing to expensive hardware ownership.

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Challenges of IaaS and How to Address Them

The challenges of IaaS are real, but they're manageable with the right planning. Most issues stem not from IaaS solutions themselves, but from organisations underestimating what ongoing infrastructure management requires.

Cost Management and Sprawl

IaaS makes it easy to provision resources — which also makes it easy to over-provision and forget about idle instances. Cloud spend management requires active monitoring, tagging resources for cost allocation, and implementing policies to automatically stop or terminate unused resources.

Mitigation: Use provider-native cost tools (AWS Cost Explorer, Azure Cost Management) alongside third-party platforms like CloudHealth or Spot.io. Set budget alerts and review utilisation monthly.

Complexity of Management

Managing IaaS requires expertise across networking, operating systems, security, and cloud architecture. Teams without this expertise can create insecure or inefficient environments. IaaS solutions offer significant flexibility, but that flexibility comes with responsibility for configuration and ongoing oversight.

Mitigation: Invest in training or partner with a managed service provider who can handle IaaS operations and provide oversight.

Vendor Lock-In

Relying heavily on proprietary services from a single provider can make it difficult and expensive to switch later. Deep use of provider-specific managed services (rather than open standards) increases this risk.

Mitigation: Design with portability in mind where possible. Use containerisation (Docker, Kubernetes) to reduce dependency on specific VM configurations. Evaluate multi-cloud strategies for critical workloads.

Compliance and Data Sovereignty

Australian businesses must carefully consider where data is stored and processed, particularly for sensitive or regulated data. Not all cloud regions provide equivalent compliance certifications.

Mitigation: Confirm the provider's compliance posture for your industry, use data residency controls to restrict workloads to Australian regions, and document your compliance position for auditors.

Skills Needed to Implement IaaS and Manage Cloud Environments

Effective infrastructure management in IaaS environments draws on a range of disciplines. For organisations planning to implement IaaS, understanding these skill requirements early helps avoid gaps that slow deployment or create security risks.

• Cloud architecture — Designing scalable, resilient, cost-effective environments using provider-specific services and well-architected framework principles
• Networking — Understanding VPCs, subnets, routing, DNS, load balancing, and private connectivity options
• Operating systems — Linux and Windows administration, patching, and hardening
• Security — IAM, encryption, network security, vulnerability management, and compliance frameworks
• Infrastructure as Code (IaC) — Using tools like Terraform, AWS CloudFormation, or Azure Bicep to define infrastructure in version-controlled code rather than manual configuration
• Monitoring and observability — Setting up logging, metrics, and alerting using cloud-native tools and third-party platforms

For organisations without dedicated cloud teams, managed service providers fill this skills gap — handling day-to-day IaaS operations, security monitoring, and optimisation.

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How to Choose the Right IaaS Solution for Your Infrastructure Needs

IaaS Solution Evaluation Criteria

When selecting an IaaS solution, assess the following against your specific infrastructure needs:

• Australian region availability — Does the provider operate a local region, and does it meet your data residency requirements?
• Compliance certifications — Does the provider hold relevant certifications (ISO 27001, SOC 2 Type II, IRAP for government workloads)?
• Service breadth — Does the provider's catalogue cover the managed services you're likely to need (databases, Kubernetes, AI/ML)?
• Pricing model — Understand on-demand, reserved, and spot/preemptible pricing options; run cost modelling before committing
• Support tiers — Assess response time service level agreements for critical issues; free support tiers are rarely adequate for production workloads
• Migration support — Does the provider offer credits, tooling, or partner networks to assist with migration?

Multi-Cloud vs Single Provider

A single-provider strategy is simpler to manage and often delivers better pricing through commitment discounts. A multi-cloud strategy provides resilience against provider outages and avoids lock-in but adds operational complexity. For most Australian SMBs, starting with a single provider and introducing multi-cloud selectively is the more practical approach.

IaaS and Cloud-Based Infrastructure Services from Ketcomm IT

Managing cloud infrastructure well requires more than signing up with a provider — it requires architecture experience, security discipline, and ongoing operational oversight.

Ketcomm IT's Infrastructure and Cloud services are built for Australian businesses that need a reliable IaaS solution without the overhead of managing it themselves. Whether you're moving workloads from on-premises infrastructure to the public cloud, or looking to optimise an existing environment on AWS, Azure, or Google Cloud, Ketcomm IT covers the full lifecycle — from workload assessment and migration planning through to security configuration, compliance alignment under the Australian Privacy Act, and ongoing managed operations.

Contact Ketcomm IT to discuss your infrastructure requirements.

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