What Is Infrastructure as a Service (IaaS)?

What is IaaS?

IaaS stands for Infrastructure as a Service. The term describes how cloud computing works. It’s essentially renting out physical servers, network connections, software licenses, and other IT components rather than buying them outright.

IaaS is a service offered by cloud computing providers such as Amazon Web Services or Microsoft Azure. These services allow companies to rent out virtual machines, storage space, networking bandwidth, and other resources needed to run their applications.

There are many benefits to this approach:

– There is no upfront cost

– No maintenance

– You only pay for what you use

– Your application will be up-to-date with the latest technology

– You can scale your system up or down at any time

– You can move your application from one location to another easily

IaaS Platform and Architecture

The infrastructure as a Service market is made up of many different offerings, which provide a specific set of capabilities designed to meet the needs of a particular type of customer. For example, there are public clouds, private clouds, hybrid clouds, and even bare metal servers.

Each offering addresses a different set of requirements and uses various technologies to achieve those goals. This article focuses specifically on infrastructure as a Service (IaaS), which includes everything from Amazon Web Services to Windows Azure to OpenStack to VMware vCloud Air to Rackspace Cloud Servers.

These platforms allow you to deploy and run applications in the cloud without worrying about how to build and maintain the underlying infrastructure. They take care of the low-level plumbing so that developers can focus on writing code.

This section will discuss some of the most common IaaS offerings available today. It’s important to note that not all vendors offer every service described here, nor do they necessarily support all of them. However, it’s likely that at least one vendor offers something similar for your use case.

Public Clouds

A public cloud is an online marketplace where third parties sell their computing resources, including hardware, software, networking, and data center space. Public clouds are typically hosted by large companies or organizations who want to make their resources available to other businesses or individuals through subscription models. The term “public” means that anyone with an internet connection can log into the system and use these resources.

A public cloud provider may offer multiple services, but the core offering is usually just a pool of virtual machines running on commodity hardware. The provider manages the underlying infrastructure, including power, cooling, and networking. Customers pay only for what they use.

Private Clouds

A private cloud is a collection of virtual machines deployed within a single organization. Private clouds are generally used to host mission-critical applications that require high availability and strict control over user access.

Hybrid Clouds

A hybrid cloud combines both public and private clouds. You can use public cloud components for hosting websites and apps while using private cloud components for more sensitive workloads. Hybrid clouds also enable you to move workloads between private and public clouds based on demand.

Bare Metal

Bare metal refers to the provisioning of physical servers and associated equipment. Some vendors offer essential metal solutions for customers who need dedicated servers with no operating systems installed. Other vendors provide basic metal solutions for customers looking to install Linux or Microsoft Windows Server on their hardware.

IaaS vs SaaS vs PaaS

In general, there are three models of cloud computing: Software-as-a-Service (SaaS), Platform-as-a-service (PaaS), and Infrastructure as a service (IaaS). Each model offers different benefits, but most offer similar functionality.

Infrastructure-as-a-Service (IaaS) is a form of cloud computing where the consumer pays a monthly fee to access shared resources hosted on a remote network. These resources include servers, storage, networks, and other fundamental computing components. IaaS offerings include Amazon Elastic Compute Cloud (Amazon EC2), Windows Azure, GoGrid, Rackspace Hosting, and SoftLayer.

Software-as-a-service (SaaS) is a model for web application deployment. With SaaS, consumers use applications through a web browser or API rather than installing client software on their computers. Some examples of SaaS offerings include Salesforce.com, Office 365, Google Apps, and QuickBooks Online.

Platform-as-a-services (PaaS) provides developers with tools and frameworks to develop software. A PaaS provider gives consumers access to development platforms such as Hadoop, NoSQL databases, and mobile app development kits. PaaS offerings include Heroku, AppFog, and OpenShift.

How Does IaaS Work?

Infrastructure as a Service (IaaS) delivers on-demand access to computing resources by combining physical infrastructure, virtualization, and automation.

Large-scale data centers form the foundation, hosting physical servers, storage systems, and networking components. These resources form the backbone of the cloud environment and support multiple users and workloads simultaneously.

Virtualization enables efficient use of this infrastructure. A hypervisor divides a single physical server into multiple virtual machines (VMs), each operating independently with its own operating system and applications. This allows multiple workloads to run on the same hardware without interference. The hypervisor also manages resource allocation, distributing CPU, memory, and storage based on demand.

When a user requests infrastructure, they select the required resources—such as CPU, memory, and storage—through a management console or API. The platform then automatically provisions virtual machines with the specified configurations, enabling rapid deployment without manual setup.

Automation is central to IaaS operations. Automated systems handle tasks such as provisioning, configuration, scaling, and monitoring. Features such as auto-scaling and load balancing enable applications to adapt to changing demand, while backup and disaster recovery mechanisms ensure data protection and business continuity.

In essence, IaaS integrates physical infrastructure with virtualization and automation to provide flexible, scalable, and efficient computing resources over the internet.

Advantages of IaaS

If you’re looking to save money and reduce overhead, Infrastructure as a Service could be a good fit. Here are some advantages of IaaS:

Cost savings – Many companies choose IaaS because it saves money and lets them avoid paying for equipment, software licenses, and support contracts. Instead, they pay for what they use.

Flexibility – With IaaS, you can start small and grow as your business grows. You can add more computers as needed.

Scalability – Because you aren’t responsible for maintaining your own servers, you can scale your system up as your needs change. For example, if you launch a new product, you can quickly add capacity to handle increased demand.

Security – Since outsourcing your IT responsibilities, you don’t have to worry about security breaches. Your sensitive information is stored in secure data centers, so hackers can’t steal it.

Accessibility – Because you aren’t responsible for maintaining your IT infrastructure, you can concentrate on growing your business. You don’t have to worry about whether your network connection is working correctly or viruses are infecting your computers.

Availability – Because you’re paying a monthly fee, you know that your system will always be available. You don’t have to worry about finding someone to fix your computer when it breaks.

Data Backup – An IaaS provider backs up your data daily. This means that even if something goes wrong, you still have a copy of your information stored safely away.

Performance – IaaS providers give you access to powerful servers optimized for running applications. These servers are designed to handle large amounts of traffic very efficiently.

Disadvantages of IaaS

You may not get access to cutting-edge technology –

Although IaaS provides excellent value for companies without the budget or personnel to maintain their own IT infrastructure, it doesn’t offer the same level of customization as traditional hosting solutions. You may miss out on some of the newest technologies available.

Your data isn’t always safe.

Although data centers are generally well protected, you still risk losing valuable information if something happens to your hard drive. Also, because you’re sharing resources with hundreds of other customers, someone else’s activity could slow your system.

How Do Businesses Manage IaaS Infrastructure?

Managing Infrastructure as a Service (IaaS) involves maintaining the performance, availability, security, and operational efficiency of cloud-based computing resources. Although cloud providers manage the underlying physical infrastructure, businesses remain responsible for configuring and operating many of the resources deployed in their IaaS environments.

Effective IaaS management requires coordination between cloud administrators, network engineers, security teams, and IT operations personnel. Organizations should establish clear responsibilities for monitoring Infrastructure, managing changes, troubleshooting incidents, and maintaining service availability.

Key IaaS management activities include:

• Virtual machine management: Monitor virtual machines, allocate computing resources, and remove unused instances to maintain performance and control costs.
• Network configuration: Manage virtual networks, routing, connectivity, firewalls, and access rules to support secure communication between applications and systems.
• Performance management: Track CPU utilization, memory consumption, storage capacity, network latency, and application dependencies to identify potential bottlenecks.
• Configuration and change management: Document infrastructure configurations, control changes, and verify that modifications do not introduce unexpected operational risks.
• Security and access management: Apply appropriate permissions, review administrative access, and maintain visibility into changes across cloud resources.
• Incident management: Establish procedures to detect infrastructure problems, assign ownership, escalate incidents, and restore normal operations.

Businesses should also define service-level objectives, reporting procedures, and escalation paths for critical infrastructure components. These measures help IT teams identify responsibility gaps and respond consistently when problems affect business applications.

Organizations with limited internal resources may need additional operational support to monitor Infrastructure, investigate performance issues, and coordinate incident resolution. The right management model depends on the environment’s complexity, internal expertise, business requirements, and the services provided by the cloud vendor or an external support partner.

How Should Businesses Monitor IaaS Infrastructure?

IaaS infrastructure monitoring helps businesses identify performance degradation, connectivity problems, resource constraints, and availability issues before they cause significant operational disruption. Without adequate monitoring, IT teams may discover infrastructure problems only after applications become slow or business services become unavailable.

An effective monitoring strategy should cover the infrastructure components that support critical workloads, including virtual machines, storage, network connections, operating systems, and relevant application dependencies.

Businesses should monitor the following metrics and events:

• CPU and memory utilization: Identify sustained resource pressure that could affect application performance or require resource adjustments.
• Storage capacity and performance: Track available storage, latency, throughput, and capacity growth to reduce the risk of resource exhaustion.
• Network performance: Monitor latency, packet loss, bandwidth utilization, connectivity failures, and unusual traffic patterns.
• Infrastructure availability: Track the availability of important virtual machines, network components, and business-critical services.
• System and security events: Review relevant logs, authentication events, configuration changes, and alerts that may indicate operational or security problems.
• Backup and recovery status: Verify that backup jobs complete successfully and that recovery procedures remain suitable for business requirements.

Monitoring should include meaningful alert thresholds and clear escalation procedures. For example, a short-lived increase in CPU utilization may not require immediate intervention, whereas sustained resource saturation affecting a critical application may need urgent investigation.

Businesses should also correlate alerts across infrastructure components. A slow application might result from network congestion, storage latency, insufficient computing resources, or an upstream service issue. Reviewing related metrics helps IT teams investigate the root cause instead of treating every alert as an isolated event.

Regular reporting can help organizations identify recurring incidents, capacity trends, performance bottlenecks, and opportunities to improve infrastructure reliability. ExterNetworks’ infrastructure monitoring and support capabilities may be relevant to businesses seeking additional operational visibility, depending on their service requirements.

Who Is Responsible for IaaS Security?

IaaS security generally follows a shared responsibility model. The cloud provider protects the underlying physical Infrastructure and the services it operates. At the same time, the customer remains responsible for securing many of the resources, configurations, identities, applications, and data deployed in the cloud. The precise division of responsibility varies by provider, service, and deployment configuration.

Businesses should understand these responsibilities before deploying production workloads. Assuming that a cloud provider automatically manages every security control can leave important gaps in infrastructure protection.

Common customer-side IaaS security responsibilities include:

• Identity and access management: Apply least-privilege permissions, protect privileged accounts, and regularly review access rights.
• Operating system security: Maintain supported operating systems, apply appropriate security updates, and remove unnecessary services.
• Network security: Configure virtual networks, firewall rules, segmentation, and remote access controls according to business requirements.
• Workload and application protection: Secure applications and workloads deployed on IaaS resources, including their configurations and dependencies.
• Data protection: Apply appropriate encryption, access restrictions, retention policies, and backup protections to sensitive business information.
• Logging and incident response: Enable relevant logging, review security alerts, investigate suspicious activity, and maintain an incident response process.

Document security responsibilities for each critical workload. Businesses should identify which controls the cloud provider manages, which they operate internally, and which require assistance from an external service partner.

Regular configuration reviews and security assessments can help identify exposed services, excessive permissions, outdated systems, and other preventable weaknesses. Organizations should also test incident response procedures and confirm that security alerts reach the appropriate personnel.

External infrastructure or security monitoring can supplement internal capabilities, but outsourcing does not automatically transfer every security obligation to the provider. Businesses remain responsible for understanding their contractual arrangements, regulatory requirements, and shared security responsibilities.

How Can Businesses Maintain IaaS Availability and Performance?

Maintaining IaaS availability and performance requires more than selecting sufficient computing resources. Businesses must also understand application dependencies, monitor infrastructure health, plan for failures, and establish incident-resolution procedures.

Resource exhaustion, network connectivity problems, storage performance issues, configuration changes, software failures, and cloud service outages can affect infrastructure availability. A structured operational approach helps IT teams reduce avoidable disruption and recover more efficiently when problems occur.

Businesses can improve IaaS availability and performance through several practices:

• Monitor critical workloads: Track infrastructure health, resource utilization, and service availability to catch developing problems early.
• Plan capacity proactively: Review resource consumption and growth trends to determine whether you need additional computing, memory, storage, or network capacity.
• Design for resilience: Where business requirements justify it, use appropriate redundancy, multiple availability zones, or other supported resilience mechanisms to reduce dependence on a single component.
• Define recovery objectives: Set recovery time objectives (RTOs) and recovery point objectives (RPOs) based on the business impact of an outage or data loss.
• Control infrastructure changes: Test significant configuration changes, document approvals, and maintain rollback procedures for changes that cause unexpected problems.
• Investigate recurring incidents: Identify root causes instead of repeatedly resolving symptoms, and track corrective actions through completion.

Businesses should also distinguish infrastructure availability from application availability. A virtual machine may be running while the application it supports remains unavailable because of a database, network, authentication, or external service dependency.

Performance reports and incident records can help IT teams identify recurring bottlenecks and determine whether they require configuration changes, resource adjustments, architectural improvements, or further investigation.

Organizations should evaluate availability against their own business requirements and applicable cloud service commitments. No monitoring or infrastructure design can eliminate every outage, but proactive monitoring, resilience planning, and well-defined response procedures can reduce the operational impact of failures.

What IT Support Does an IaaS Environment Require?

An IaaS environment requires ongoing operational support to maintain infrastructure health, resolve technical problems, coordinate changes, and keep cloud-based workloads aligned with business requirements. The level of support depends on the environment’s size, workload complexity, internal IT capabilities, and the cloud provider’s service boundaries.

Even when a cloud provider manages the underlying physical Infrastructure, businesses may still need support for virtual machines, operating systems, network connectivity, workload performance, configuration issues, and incident coordination.

Typical IaaS support responsibilities include:

• Infrastructure monitoring: Review alerts, identify abnormal behavior, and escalate issues based on severity and business impact.
• Incident troubleshooting: Investigate virtual machine failures, network connectivity issues, storage problems, and infrastructure performance degradation.
• Network and connectivity support: Troubleshoot routing, firewall configuration, remote access, and communication between cloud resources and other business systems.
• Capacity and performance reviews: Identify resource constraints, recurring bottlenecks, and opportunities to improve infrastructure utilization.
• Change coordination: Support infrastructure changes through documented procedures, approvals, testing, and appropriate rollback planning.
• Operational reporting: Track incidents, response and resolution trends, recurring problems, and infrastructure health indicators.

Businesses can provide these capabilities through an internal IT team, the cloud provider’s support services, a specialist external provider, or a combination of these options.

External support may be worth evaluating when internal teams lack the resources to maintain adequate monitoring coverage, manage recurring infrastructure incidents, or support the organization’s operational requirements. Before selecting a provider, businesses should clarify service scope, supported technologies, coverage hours, escalation procedures, reporting expectations, and contractual service commitments.

ExterNetworks is a candidate if its infrastructure monitoring and support offerings align with these requirements. Businesses should confirm the specific services available, including supported cloud platforms and coverage arrangements, before relying on an external provider for operational responsibilities.

The objective is to establish a support model that provides appropriate visibility, clear accountability, and timely incident handling without duplicating responsibilities already covered by the cloud provider or internal IT team.

How to Choose the Right IaaS Provider

There are several things to consider when choosing an IaaS provider:

• Security – Look for a company that uses secure protocols and encryption technologies. For example, Amazon Web Services uses SSL/TLS, which encrypts information before it travels across the Internet.
• Scalability – Do you plan to grow rapidly? Are there any limits to how fast you want to grow? How much do you expect to spend per month?
• Performance – Are you looking for performance or low latency? Do you need high availability? Is disaster recovery vital to you?
• Reliability – Will you be using this service frequently? What will happen if the service goes down? How long will it take for them to restore service?
• Cost – How much do you want to pay each month? Can you get better deals elsewhere?
• 24/7 support – Can you contact someone who can help you whenever you need it? Can they assist during non-business hours?
• 24/7 monitoring – Is there someone available to monitor your environment around the clock?
• Compliance – Does your provider offer compliance services if you work with regulated industries like banking, health care, and finance?

In conclusion, IaaS is an effective way to scale your IT infrastructure quickly and efficiently. The advantages of IaaS are numerous. However, many different types of clouds are available today, each offering its unique combination of services. Therefore, it is essential to research which cloud best suits your needs.