VirtualBox

kc@example.com (kc kim) — Sun, 26 Mar 2023 23:09:00 +0900

What Is VirtualBox?

VirtualBox is hypervisor software that runs another OS inside an OS. For example, you can start VirtualBox on Windows and run a Linux-based OS such as CentOS or Ubuntu, or another version of Windows, as a VM (Virtual Machine).

Other hypervisors include VMware, KVM, Hyper-V, and Xen. VirtualBox runs on Windows, Linux, Mac OS X, and other platforms. In VirtualBox, you can run operating systems such as Linux, Windows, Mac OS X Server, FreeBSD, and OpenBSD.

The license is GPLv2. It was originally developed by innotek, then acquired by Sun Microsystems, and later acquired by Oracle. Oracle continues to develop it today. Its official name is Oracle VM VirtualBox.

Features of VirtualBox

One of VirtualBox’s features is its ease of use on the desktop. If you install VirtualBox Additions on the guest OS, you can integrate mouse behavior with the window manager on the host OS side. This allows smooth mouse movement. The clipboard can also be shared between the guest OS and host OS, so copy and paste or cut and paste can be performed normally.

For screen display, the following three modes are supported.

Scaled mode
- A mode where the guest OS runs in a virtual machine window.
Full-screen mode
- Uses the entire screen to display the guest operating system.
Seamless mode
- Displays the guest OS integrated into the host OS window. Each GUI application appears on the screen like an application running on the host OS.

Direct3D also works, although it is an experimental implementation.

Because of these features, VirtualBox is suitable for desktop use rather than server virtualization.

Installing VirtualBox

To install VirtualBox, download it from the following site.

https://www.virtualbox.org/wiki/Downloads

Double-click the downloaded file to install it.

Reference

Wikipedia | VirtualBox

Windows Hyper-V

kc@example.com (kc kim) — Sun, 07 Mar 2021 02:08:48 +0900

What Is Virtualization?

In general, an OS runs on hardware such as memory and hard disks. By running that hardware as software, you can create another computer inside an OS.

Benefits of Virtualization

You can save space, energy, and cost by reducing the number of physical servers.
You can build different OS environments.
You can reduce the cost and time needed to prepare environments.

Drawbacks of Virtualization

Because overhead is added, applications that depend heavily on hardware may not work properly.

What Is Hyper-V?

Hyper-V is a virtualization technology provided by Microsoft.

Hyper-V Features

Hyper-V has two major characteristics.

It is a Windows Server feature.
- Because Microsoft provides it just like Windows, it is included with Windows Server, has no additional cost, and is simple to use.
It is hypervisor-based virtualization technology.
- Unlike host-based virtualization technology such as Virtual Server, it runs on a hypervisor in the same way as the management OS, so it operates faster than host-based virtualization.

Enable Hyper-V

To use Hyper-V, you must install and enable it first. Enable it through the page below.

Install Hyper-V on Windows 10 | Microsoft official site

Install CentOS on Hyper-V

Download the CentOS Installation File

CentOS Download

Download CentOS Stream 9 x86_64 from the link above.

Quickly Create a Virtual Machine for Installing CentOS on Hyper-V

Here, create a virtual machine with Quick Create.

Open Hyper-V and click “Quick Create…”.
When the “Create Virtual Machine” dialog appears, click “Local installation source (_L)”, then click the “Change installation source” button.
In the file selection window opened by “Change installation source”, select the CentOS .iso file downloaded earlier. Since you are not installing Windows, clear the “This virtual machine will run Windows” checkbox.
Click “More options” to show the “Name” and “Network” fields. Enter any name you want, then click “Create Virtual Machine”.
The screen changes to the virtual machine creation screen, and messages appear while it creates several items.
After a short wait, it finishes with the message “The virtual machine was created successfully.”

Create a New Virtual Machine for Installing CentOS on Hyper-V

Here, create a virtual machine by using New Virtual Machine.

Open Hyper-V and click “New…”.
Specify Name and Location: set a name and select the installation location. Here, the D drive is specified.
Specify Generation: select the desired generation. Here, proceed with the default Generation 1.
Assign Memory: the default is 1024 MB, but here it is changed to 4096 MB.
Configure Networking: select the connection setting to use.
Connect Virtual Hard Disk: configure the hardware. Here, only the size is set to 80 GB.
Installation Options: select options for the operating system to install. Here, select the CentOS .iso file from above.
Summary: the items selected above are summarized. Click the final “Finish” button to complete.

Install CentOS on Hyper-V

Now install CentOS on Hyper-V.

If you created the virtual machine with “Quick Create”, click the “Connect” button after the installation screen appears.
Or select the added virtual machine from the list and click “Connect”.
A black screen appears as shown below. Click “Start”.
Select “Install CentOS Stream 9”.
When the language selection screen appears, click “Continue”.
This is the configuration screen.
1. You must configure all items with warning marks before the “Begin Installation” button becomes active.
2. On the “Installation Summary” screen, click “Installation Destination”, select the disk to install to, and click “Done”.
3. On the “Installation Summary” screen, click “Root Password”, set the root account password, and click “Done”.
4. On the “Installation Summary” screen, click “User Creation”, set the user information, and click “Done”.
5. On the “Installation Summary” screen, click “Software Selection”, select the base environment, and click “Done”. Here, select “Minimal Install” because CLI will be used.
6. When all settings are complete, click “Begin Installation”.
Installation now proceeds.
When installation finishes with the message “Complete!”, click “Reboot System”.
After rebooting, you can confirm that login works with the account configured above.

devkuma – Virtualization

VirtualBox

What Is VirtualBox?

Features of VirtualBox

Installing VirtualBox

Reference

Windows Hyper-V

What Is Virtualization?

Benefits of Virtualization

Drawbacks of Virtualization

What Is Hyper-V?

Hyper-V Features

Enable Hyper-V

Install CentOS on Hyper-V

Download the CentOS Installation File

Quickly Create a Virtual Machine for Installing CentOS on Hyper-V

Create a New Virtual Machine for Installing CentOS on Hyper-V

Install CentOS on Hyper-V