Virtualization Flashcards
Hardware virtualization
Takes the entire computer that an OS expects to interact with and virtualizes it
Physical host computer uses a Hypervisor to create environments that have virtual versions of all the “hardware” devices you need to install and run an OS
Hypervisor
Allocates fractions of the hosts real hardware resources to power these virtual devices
VM
Virtual machines
The environments created by the Hypervisor to be used for virtualization
Client side virtualization
When the VM host also serves as someone’s day to day workstation
Benefits of virtualization
- Saving resources
- Systems easier to manage
Purpose of virtualization
- Sandboxing
- Development testing
- Application virtualization
Application virtualization
- Legacy software/OS: running applications for a different software
- Cross-platform virtualization: running applications written for another OS
VM networking
- Internal network created for VMs within the same Hypervisor
- Virtual network only allowing communication with host system
- “Bridge” virtual NIC with host NIC for VM to join same network host is connected to
- No network, isolating VM from host, broader network, and other VMs
Type-1 Hypervisor
Bare-metal Hypervisor
No other software between the hypervisor and the hardware
Type-2 Hypervisor
Applications like virtualbox on an OS
The service-layer cake
Software as a service (SaaS)
Platform as a service (PaaS)
Infrastructure as a service (IaaS)
SaaS
Top layer of “cake”
Web applications
Ex. Google maps etc
PaaS
Middle layer
Gives programmers all the tools they need to deploy, administer, and maintain a Web application
Built on an infrastructure that is invisible to the developer
Developer has no direct control of the infrastructure
IaaS
Bottom layer
Just hardware provided by companies like Amazon (AWS)
Still responsible for configuring and maintaining the OS and software of any created virtual machines
Cloud resources
Shared resources
Rapid elasticity
Metered utilization
High availability
File sync
Public cloud
Software, platforms, and infrastructure delivered through networks that the general public can use
Hardware often provided by companies like google, Amazon, and microsoft
Private cloud
Internal cloud built by a company for themselves
Needs complete ownership of data with flexibility of the cloud
Departments can build and destroy VMs as needed
Can afford to build and maintain the IaaS it will be built on
Can also hire a 3rd party to build and maintain/host for them
Community cloud
Private cloud paid for and used by multiple organizations
Not for citizens use
Used by groups of organizations with similar goals/needs
Hybrid cloud
Some combination of private, public, and community cloud services
Allows communication between the different cloud services for that company
Application can grow into a public cloud instead of grind to a halt, while maintaining privacy data
VDI
Virtual desktop infrastructure
Desktop virtualization in which each users client programs connect to an automatically managed virtual machine running on a central server
Can be set up on premises or in the cloud
