IaaS – Infrastructure as a service

Infrastructure as a service (IaaS)

From Wikipedia, the free encyclopedia

Join the related FREE PM templates related Facebook Group (LIKE Facebook page) and LinkedIn Group. Click here to purchase 70+ project management templates with FREE upgrades thereafter.

Infrastructure as a service (IaaS) are online services that provide high-level APIs used to dereference various low-level details of underlying network infrastructure like physical computing resources, location, data partitioning, scaling, security, backup etc. A hypervisor, such as XenOracle VirtualBoxOracle VMKVMVMware ESX/ESXi, or Hyper-V, LXD, runs the virtual machines as guests. Pools of hypervisors within the cloud operational system can support large numbers of virtual machines and the ability to scale services up and down according to customers’ varying requirements.

Project Management Templates for both Agile and Waterfall project planning and tracking.


Typically IaaS involves the use of a cloud orchestration technology like Open StackApache Cloudstack or OpenNebula. This manages the creation of a virtual machine and decides on which hypervisor (i.e. physical host) to start it, enables VM migration features between hosts, allocates storage volumes and attaches them to VMs, usage information for billing and lots more.

An alternative to hypervisors are Linux containers, which run in isolated partitions of a single Linux kernel running directly on the physical hardware. Linux cgroups and namespaces are the underlying Linux kernel technologies used to isolate, secure and manage the containers. Containerisation offers higher performance than virtualization, because there is no hypervisor overhead. Also, container capacity auto-scales dynamically with computing load, which eliminates the problem of over-provisioning and enables usage-based billing.[1]

IaaS clouds often offer additional resources such as a virtual-machine disk-image library, raw block storage, file or object storage, firewalls, load balancers, IP addresses, virtual local area networks (VLANs), and software bundles.[2]

The NIST‘s definition of cloud computing defines infrastructure as a service as:[3]

The capability provided to the consumer is to provision processing, storage, networks, and other fundamental computing resources where the consumer is able to deploy and run arbitrary software, which can include operating systems and applications. The consumer does not manage or control the underlying cloud infrastructure but has control over operating systems, storage, and deployed applications; and possibly limited control of select networking components (e.g., host firewalls).

According to the Internet Engineering Task Force (IETF), the most basic cloud-service model is that of providers offering IT infrastructure – virtual machines and other resources – as a service to subscribers.

IaaS-cloud providers supply these resources on-demand from their large pools of equipment installed in data centers. For wide-area connectivity, customers can use either the Internet or carrier clouds (dedicated virtual private networks). To deploy their applications, cloud users install operating-system images and their application software on the cloud infrastructure.[4][unreliable source?] In this model, the cloud user patches and maintains the operating systems and the application software. Cloud providers typically bill IaaS services on a utility computing basis: cost reflects the amount of resources allocated and consumed.[5][6][7][8][9]

See also

  • CISPE, an IaaS trade association in Europe.


  1. ^ “ElasticHosts Blog”Elastichosts. 2014-04-01. Retrieved 2016-06-02.
  2. ^ Alex Amies; Harm Sluiman; Qiang Guo Tong; Guo Ning Liu (2 July 2012). Developing and Hosting Applications on the Cloud: Develop Hosting Applica Cloud. Pearson Education. ISBN 978-0-13-306685-2.
  3. ^ Peter Mell and Timothy Grance (September 2011). The NIST Definition of Cloud Computing (Technical report). National Institute of Standards and Technology: U.S. Department of Commerce. doi:10.6028/NIST.SP.800-145. Special publication 800-145.
  4. ^ Ananich, Anthony (February 20, 2016). “What is IaaS?”ananich.pro. Archived from the original on March 2, 2016. Retrieved 2016-02-20.
  5. ^ “Amazon EC2 Pricing”aws.amazon.com. Retrieved 7 July 2014.
  6. ^ “Compute Engine Pricing”cloud.google.com. Retrieved 7 July 2014.
  7. ^ “Microsoft Azure Virtual Machines Pricing Details”azure.microsoft.com. Retrieved 7 July 2014.
  8. ^ “cloud.ca”.
  9. ^ “Pricing | Safe Swiss Cloud”http://www.safeswisscloud.ch. Retrieved 2018-05-01.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s