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Create Virtual Machines in Ubuntu with QEMU KVM Tool

in Virtualization by (552k points)
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Create virtual machines with QEMU in Ubuntu

Virtualization helps us to test, use and configure machines from various operating systems such as Linux, macOS or Windows on computers that are still incompatible due to the file system used, the great advantage of virtualization is that it saves costs by not having to buy new hardware and in case of errors or critical failures only the virtual machine will be affected but not the physical equipment, in the case of Ubuntu we have a comprehensive application for this type of task such as QEMU/KVM..

 

QEMU/KVM is an emulator that allows us to virtualize generic machines under open source which is constantly updated, its use allows us to emulate a system offering a virtual model of the complete machine with respect to its components such as processor, RAM, disks, etc. , this allows running a guest operating system, this allows QEMU to act as a KVM, Xen, Hax or Hypervisor hypervisor.

 

 

[panelplain='']Another function of QEMU is to perform user mode emulation which gives us the possibility of starting processes compiled from one computer on another computer, some of its most outstanding features are:

 

  • It has standalone command line utilities
  • Allows you to create, convert and modify disk images
  • Supports ARM, MIPS (little endian), PPC, RISC-V, s390x, SPARC, and X86 architectures
  • Can run Linux OS, macOS, FreeBSD, NetBSD, OpenBSD and Windows systems
  • Full system emulation
  • QEMU can run without a host kernel driver
  • It has dynamic translation to native code
  • Emulation of clone() via native CPU clone() in order to use the Linux scheduler for threads
  • Generic Linux system call converter
  • QEMU makes use of full software MMU for maximum portability across machines
  • You can use an accelerator in the KVM kernel
  • Supports symmetric multiprocessing (SMP)

 

[/panelplain]

 

Let's see how to install and use QEMU on Ubuntu..

 

 

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Create virtual machines with QEMU in Ubuntu

 

Step 1

To start we open the terminal and validate that virtualization is enabled:
 egrep -c '(vmx|svm)' /proc/cpuinfo 
Step 2

If the result is greater than zero it means that it is, if it is 0 the virtualization will not be enabled.

 

 

image

 

Step 3

Alternatively we run:
 grep -E --color '(vmx|svm)' /proc/cpuinfo 
The colored result is the type of CPU used:

 

 

image

 

Step 4

If it is vmx it will be Intel and if it is svm it will be AMD. We validate that the system supports virtualization by executing:
 kvm-ok 
image

 

step 5

We install the utility:
 sudo apt install cpu checker 
image

 

Step 6

We enter the letter S to confirm the installation process:

 

image

 

step 7

We validate again:
 kvm-ok 
image

 

step 8

We update the system:
 sudo apt update 
image

 

step 9

We install QEMU/KVM and the necessary packages:
 sudo apt install qemu-kvm virt-manager virtinst libvirt-clients bridge-utils libvirt-daemon-system 
image

 

step 10

Confirm the process by entering the letter S:

 

image

 

step 11

We wait for the process to start:

 

image

 

step 12

At the end we will see the following:

 

image

 

step 13

We enable and start the service:
 sudo systemctl enable --now libvirtd sudo systemctl start libvirtd 
image

 

step 14

Check the status of the service:
 sudo systemctl status libvirtd 
image

 

step 15

We add the user to the kvm and libvirt groups:
 sudo usermod -aG kvm $USER sudo usermod -aG libvirt $USER 
image

 

step 16

We open the QEMU/KVM application:
 sudo virt-manager 
image

 

step 17

We go to "File - New virtual machine":

 

image

 

step 18

We will see the following: We
activate the "Local installation media (ISO image or CDROM)" box and click Forward to see the following:

 

image

 

step 19

We click on "Explore" and the following will open:

 

image

 

step 20

We click on "Explore locally" and select the ISO image:

 

image

 

step 21

We click Open to see the added image:

 

image

 

step 22

There the system to use will be detected.

 

image

 

step 23

In the pop-up window we click "Yes" for the emulator:

 

image

 

step 24

Now we allocate RAM and CPU memory:

 

image

 

step 25

Then we set the disk size:

 

image

 

step 26

We click on Forward and we can assign a name and manage the network:

 

image

 

step 27

We click "Finish" and the virtual machine will open automatically:

 

image

 

step 28

We will see the current virtual machine:

 

image

 

step 29

The start menu will load:

 

image

 

step 30

We right click on the virtual machine to see its options:

 

There it will be possible to turn it off, restart it, pause it, delete it, migrate it to another computer or open its properties.

 

image

 

 

step 31

Within the virtual machine we have some menus, from Virtual Machine it is possible to capture screen, restart or turn off the machine, edit USB media:

 

image

 

 

step 32

From "View" it is possible to see various options of the machine at the visualization level, scale the screen, connect automatically, see the full screen and work with snapshots:

 

image

 

step 33

In “Send key” we have a series of key combinations that can be used in the guest operating system:

 

image

 

Thus, QEMU/KVM is a complete solution to create and manage virtual machines in Ubuntu and to have the necessary options for its use there..

 


by (3.5m points)
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