Infrastructure-as-a-service is one of the three primary could services that form the backbone of cloud computing along with PaaS and SaaS. IaaS is considered the most basic form of cloud computing. When you hear the term IaaS used, it is referring to a pool of physical and/or virtual computing infrastructure offered by a cloud provider that is delivered to an organization from datacenters. Infrastructure cloud-computing resources are one of the fastest-growing categories within cloud solutions.
The components of IaaS typically include datacenters, servers, cloud storage, and networking solutions. Infrastructure-as-a-service can also include virtualization methods that boast virtual machines that employees can access via the internet. IaaS cloud providers also handle the management of the infrastructure systems themselves, as well as IP addresses, network connections, load balancers, and access management.
With so much going on, who is responsible for the various components in an IaaS model? That depends on the type of IaaS platform your company employs. For example, in a public infrastructure setup it is primarily the responsibility of the cloud-computing provider to manage and support all of the infrastructure equipment, as well as software programs running on the network in some cases. This contrasts with onsite infrastructure in which your in-house IT staff is responsible for managing, maintaining, and supporting the operational effectiveness of the computing infrastructure. Hybrid IaaS models and private cloud computing infrastructure solutions offer varying divisions of responsibility that depend on the agreement between the provider and the company.
In the end, keep in mind that most IaaS cloud providers take responsibility for servers, storage, networking, and virtualization. This leaves your company, in most cases, responsible for operating systems, middleware, runtime, data, and applications.