Cloud Computing’s Infrastructure as a Service (IaaS for short) is the foundation of cloud computing. Rather than purchasing or leasing space in an expensive datacenter, labor, real estate, and all of the utilities to maintain and deploy computer servers, cloud networks and storage, Cloud buyers rent space in a virtual data center from an IaaS provider. They have access to the virtual data center via the Internet. This type of cloud computing provides the “raw materials” for IT, and users usually only pay for the resources they consume, including (but not limited to) CPU cores, RAM, hard disk or storage space, and data transfer – example IaaS providers include ProfitBricks, Amazon EC2, or the Rackspace Cloud. All three providers allow users to “rent” virtual servers and storage while creating networks to tie them all together.
In most cases, individuals typically manage their own virtual data centers, networks and (the cloud provider manages the hardware, networks and virtualization layer) applications, including maintenance of the software and OS environment. The IaaS provider takes responsibility for the hardware and performs all the maintenance to ensure the servers run correctly. Because an infinite number of custom applications can be developed and deployed and run on IaaS, it becomes impossible for a cloud service provider team to manage and troubleshoot all of the software and hardware.
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