Introduction to cloud, OpenStack and technology terms

• 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>

1. explain virtualization vs. emulation
2. explain difference full virtualization (simulation of hardware) and para virtualization (special devices, faster)

</notes>

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

• 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

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

• 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, …)