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<wrap footer> de.NBI Cloud course </wrap>

{{no-footer}}
===== Cloud Intro =====

Introduction to //cloud//, OpenStack and technology terms

===== Term: virtualization =====

  * providing a system and its environment
  * often the same or similar architecture as underlying //bare metal// system
  * emulation of foreign architectures possible
  * usually more than just a virtual system
    * network
    * storage
  * full virtualization vs. para virtualization

<notes>
  - explain virtualization vs. emulation
  - explain difference full virtualization (simulation of hardware) and para virtualization (special devices, faster)
</notes>

===== Term: hypervisor =====

  * a software for providing virtualization
    * qemu/kvm, Xen, vmWare, HyperV, ...
    * provides a virtual environment
  * also: a (bare metal) host for running hypervisor software


===== Term: virtual machine =====

  * a virtual computer
  * virtual resources (CPU, RAM, disk, ...)  provides by hypervisor / virtual environment
  * often using predefined storage (//image//) 
  * referred to as //instance// in cloud environment

===== Term: cloud =====

  * ambiguous, overloaded marketing term
  * //IaaS//: infrastructure as a service
    * provides an environment for virtual machines
    * including network, storage, ...
  * also PaaS, SaaS, DaaS, FaaS, LBaaS, ...


===== Cloud vs. Virtualization =====

  * virtualization is base for cloud
  * pets vs. cattle
  * specialized virtualization management software for pets (e.g. vmWare)
  * //cloud// management software for cattle (Amazon EC2, Microsoft Azure, Openstack, ...)

===== OpenStack =====

{{https://www.openstack.org/assets/openstack-logo/2016R/OpenStack-Logo-Horizontal.png}}