Cloud Computing Interview Questions and Answers

OpenStack is an open source project for creating and managing cloud infrastructure, including storage, compute power, and networking, as well as many related projects to help handle everything from identity management to database deployment.

Linux containers are emerging as a way to develop applications more natively for the cloud, relying upon functionality built in to the Linux kernel as a faster alternative to virtual machines, with projects like Docker helping developers to get started with building containers, and Kubernetes for orchestrating applications made up of many containerized parts.

Big data and the Internet of Things are two users of cloud computing resources where many of the tools powering applications are being developed entirely in the open.

And many more, from the traditional Linux and Apache and MySQL and PHP web server stack to everything from cloud storage applications to collaborative online editors .Open Nebula, Open Stack and Virtual Box are common examples of open-source cloud.

Software as a Service (SaaS) (End user Customers): Software as a Service (SaaS) is a software distribution model in which applications are hosted by a vendor or service provider and made available to customers over a network, typically the Internet. SaaS has become increasingly prevalent delivery model as underlying technologies that support Web services and service- oriented architecture (SOA) mature and new development approaches, such as Ajax, become popular. SaaS is closely related to the ASP (Application service provider) and on demand computing software delivery models. Using the cloud, software such as an internet browser or application is able to become a usable tool.

SaaS Examples: Google Apps, Salesforce, Workday, Concur, Citrix GoToMeeting, Cisco WebEx

Infrastructure as a Service (IaaS) (Developers): Infrastructure as a Service (IAAS) is a form of cloud computing that provides virtualized computing resources over the internet. In an IAAS model, a third party provider hosts hardware, software, servers, storage and other infrastructure components on the behalf of its users. IAAS providers also host users’ applications and handle tasks including system maintenance backup and resiliency planning.

IaaS Examples: Amazon Web Services (AWS), Cisco Metapod, Microsoft Azure, Google Compute Engine (GCE), Joyent.

Platform as a Service (PaaS) (System Admins): Platform as a Service (PaaS) is a cloud computing model that delivers applications over the internet. In a PaaS model, a cloud provider delivers hardware and software tolls, usually those needed for application development, to its users as a service. A PaaS provider hosts the hardware and software on its own infrastructure. As a result, PaaS frees users from having to install in-house hardware and software to develop or run a new application. The branch of cloud computing that allows users to develop, run, and manage applications, without having to get caught up in code, storage, and infrastructure and so on.

PaaS Examples: Force.com, App Engine, Azure

These longer list will include also cloud computing services.

• Backend as a Service (BaaS)
• Desktop as a service (DaaS)
• Storage as a service (STaaS)
• Security as a service (SECaaS)
• Data as a service (DaaS)
• Workplace as a Service (WaaS)
• Hardware as a Service (Haas)
• Everything as a Service (EaaS)
• Test environment as a service (TEaaS)
• API as a service (APIaaS)

• Public Clouds
• Private Clouds
• Hybrid Clouds
• Community Clouds
• Federated Clouds
• Multi-clouds and Inter-clouds

• Reference architecture
• Technical architecture
• Deployment operation architecture

• Launch Phase
• Monitor Phase
• Shutdown Phase
• Cleanup Phase