Skip to main content

Hypervisor

What is hypervisor?
A hypervisor is a software that allows to run multiple virtual machines on a single hardware.

Types of hypervisor:
1. Bare metal hypervisor or type 1 hypervisor
Type 1 hypervisor are installed on the host hardware directly. Since there is no underlying software in the middle (between the hardware and hypervisor), these are faster and more efficient
Ex. VMWare ESX, Microsoft Hyper V, KVM (Kernel-based Virtual Machine)

2. Embedded hypervisor or type 2 hypervisor
Type 2 hypervisor are installed on the top of an existing operating system like Windows or Linux. Because of additional layer of management, these are considered less efficient compared to type 1 hypervisor. Also the additional layer poses security concern. Since they are installed on a hosted OS they are much easier to use.
Ex. VMWare Player, VirtualBox

So what hypervisors does Azure and Amazon use ?
Labels:

Comments

Post a Comment

Popular posts from this blog

Azure Active Directory

Azure Active directory (AAD) is a Identity as a Service. This is a smaller subset of Active directory. This is not a replacement to active directory at all. Azure active directory provides the identity services to the mobile apps and web apps in Private cloud. These apps may be connected to on-premise applications. So an SSO is enabled for these apps. So Azure active directory has very simple functionality. Create Users, Groups. Map groups to network security groups and provide the authentication to the resources. When you login to Azure portal, right upper corner of the screen has username along with the domain. Domain or tenant or organization are used interchangeably. Management of Users and Groups: Cloud identity (create users manually)  Directory synchronized identifiers (users are synchronized)  Add users Adding a cloud identity users makes the user as Guest When you do directory synchronization on Premise AD Groups are synched up wi...
Post a Comment
Read more

Kubernetes: 19. Configure Application

Configuring application consists of Configuring commands and arguments on applications Configuring environment variables Configuring secrets Docker Commands docker run ubuntu  -> Runs ubuntu container and exit, container CMD is set to [bash], so the container quitely exits docker run ubuntu echo "Hello World" -> Runs ubuntu container, prints "Hello World" exits quitely. To update the default settings, create your own image from the base image lets call this ubuntu-sleeper image FROM ubuntu CMD sleep 5 CMD can also be mentioned in the JSON format like CMD ["sleep", "5"] Note that with JSON format the first element should always be the command to execute,  for eg, it CANNOT be ["sleep 5"] Run build the new ubuntu-sleeper image and run the new image docker build -t ubuntu-sleeper .  -> Build the image docker run ubuntu-sleeper -> Run the new image So the new image will launch ubuntu container, sleep for 5 seconds and quitely ex...
Post a Comment
Read more

underscore.js extend

underscore.js is a javascript utility library. Let us understand the extend method of this very useful library. _.extend is for extending a given object with all the properties of the passed-in object(s) Here is an example, we have three objects aObj, bObj, cObj and we want to combine them into single object. Using _.extend is a simple way of combining these objects. And before trying out the example don't forget to import the underscore.js library Now access the source code of underscore.js and look for the extend method. This is how it looks like This uses functional programming style.  createAssigner takes two inputs and returns a function. The two inputs are (1) keysFunc  (2) defaults Since it is returning a function, so a closure is formed, and the returned function remembers the two inputs Looking at the source code from the line (keys = keysFunc(source)) it is evident that keysFunc is a function itself. ...
Post a Comment
Read more