CLOUD COMPUTING

CLOUD COMPUTING

1. DEFINITIONS

   • Cloud Computing is one of computing-structure and software model that can be access to share configurable resources

2. MODELS

   • Infrastructure as a Service (IaaS)
     • Providers use virtual machine to serve their subscriber from their cloud (Hypervisor)
       • This infrastructure would let the cloud user patches and maintains the operating systems and the application software.
     • Example : Oracle VirtualBox, Oracle VM, KVM, VMware
   • Platform as a Service (PaaS)
     • Usually the provider offer a development environment to application developers
       • Including operating system, programming-language execution environment, database, and web server
     • Example : Microsoft Azure and Google App Engine
   • Software as a Service (SaaS)
     • Users gain access to application software and databases. Also known as "on-demand software"
       • User can't manage the cloud infrastructure on the application. So it defy the need to install and run the application on the cloud user's own computers.
       • PROS AND CONS
         • PROS: Doesn't need maintenance and support
         • CONS: it might get overpopulated
   • Security as a Service (SECaaS)
     • The providers integrates their security services into a corporate infrastructure on a subscription basis more cost effectively than most individuals or corporations can provide on their own
       • So the security is served through cloud computing
   • Mobile "backend" as a service (MBaaS)
     • Web app and mobile app developers are provided with a way to link their applications to cloud storage and cloud computing services with APIs exposed to their applications and custom SDKs.
       • Type of services provided such as user management, push notifications, integration with social networking services and more
   • Serverless Computing
     • cloud provider fully manages starting and stopping virtual machines as necessary to serve requests
       • The payment method doesn't abide to per virtual machine, per hour.

3. DEPLOYMENT MODELS

   • Private Cloud
     • Private cloud is cloud infrastructure operated solely for a single organization
       • It could be run by third-party either internally or externally
   • Public Cloud
     • The services are rendered over a network that is open for public use
       • It could* be free
       • Public cloud service providers operate the infrastructure at their data center and access is generally via the Internet
   • Hybrid Cloud
     • May use more than 2 types of deployment either private, community or public
       • The adoption depends to the data security and compliance requirements, level of control needed over data, and the applications an organization uses.
       • There's specialized model of hybrid cloud, which is built up to odd hardware
         • Cross-platform Hybrid Cloud

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