business tech cloud computing

method for delivering business and it services. it promises businesses and users to acquire the it resources they need, just when they need it; it is a form of on-demand it service provisioning and utilization; use of network resources, principally internet resources, to provide on-demand data processing and storage

cloud computing (cc)

the “no-need-to-know” in terms of the underlying details of infrastructure; the “flexibility and elasticity” allows these systems to scale up and down; the “pay as much as used and needed” type of utility computing and the “always on, anywhere and any place” type of network-based computing

characteristics of cloud computing

you deploy your application into an application-hosting environment provided by the cloud service vendor; the developer provides the application, and the vendor provides the ability to deploy and run it; this frees developers from hardware infrastructure management, allowing them to focus strictly on development of software

paas

software that is centrally hosted and managed for the end customer; it usually is based on a multitenant architecture—a single version of the application is used for all customers. it can be scaled out to multiple instances to ensure the best performance in all locations; typically is licensed through a monthly or annual subscription; example: microsoft office 365; subscribers are always provided the most recent version. compared to installing and upgrading office every year, this is much less expensive and requires much less effort to keep updated; other examples include dropbox, wordpress, and amazon kindle

saas

runs and manages server farms running virtualization software, enabling you to create virtual machines (vm) that run on the vendor’s infrastructure; depending on the vendor, you can create a vm running windows or linux os and install anything you want on it; typically, provider will allow you to set up virtual networks, load balancers, and storage and to use many other services that run on its infrastructure; you don’t have control over the hardware or virtualization software, but you do have control over almost everything else. in fact you are completely responsible for it; typically, provider enables the “lift and shift” model for migration to the cloud. you can configure a vm similar to the infrastructure currently running your services in your datacenter and migrate your software to the new vm

iaas

cloud resources (i.e., hardware, software, services) are built, owned, operated and maintained by a third-party cloud service provider. these resources are delivered for public consumption over the internet and shared by multiple organizations

public cloud

cloud resources are built and consumed exclusively by the same organization and maintained on a private network. can be physically located on-premises in an organization’s data center or hosted by a third-party service provider

private cloud

bridges the gap between private and public clouds: cloud resources are consumed and operated in a common way across both clouds, enabling portability of services across the various underlying cloud infrastructures

hybrid cloud

any combination of on-premises, off-premises and public cloud platforms, where cloud resources are spread across several cloud-hosting environments

multi-cloud