Get Virtualizor

Installing Softaculous Virtualizor for Linux-KVM is very simple.


  • CentOS 7.x / 8.x (Beta) or Red Hat Enterprise Linux 7 or Ubuntu 14.04 / 16.04 / 18.04 / 20.04 or AlmaLinux 8.x
  • yum / apt-get
  • Storage to create the VPS (DomUs) disks


1. In all cases please remember to disable SElinux.

2. KVM module does not support a 32-bit operating system. Please install a 64-bit OS if you want to install KVM.

3. KVM module requires VT enabled from the BIOS to be loaded.

4. We strongly recommend you make the bridge permanent. Guide - Making the bridge permanent

5. If you are using Ubuntu 18.04, please go through the following guide for making a KVM bridge: KVM Bridge on Ubuntu 18.04

6. If the server is from OVH then Install the original/stock kernel from the OVH panel by choosing its checkbox on the last step on the OVH panel while installing OS.

Partition Scheme

Partition Size Description
/ 80-100 GB Root partition containing all Hardware Node operating system files, OS templates, and ISOs
SWAP 4 GB + Paging partition for the Linux operating system(Swap memory is been used by virtual servers if there is a shortage of real memory)
Storage All the remaining space on the hard disk.  This partition can be used to create either Logical Volumes or File-Based Storage for the VPS (DomUs).
NOTE for LVM: You must NOT create any Logical Volume and MOUNT it. This must be an EMPTY VOLUME GROUP.
Virtualizor will not delete any pre-existing LVs in the Volume Group. But it's recommended to have an empty Volume Group.

NOTE for File Storage: You must create and mount the folder.

Supported storage types

( LVM | File | Thin LVM | ZFS | ZFS Thin | ZFS Compressed | ZFS Thin Compressed | Ceph Block Device )


Open a Shell Terminal (e.g. PuTTY) and SSH to your server. Run the following commands:

wget -N
chmod 0755
./ kernel=kvm
Always provide a valid email address else the installation will fail!

Installation Parameters

  • email - The Admin Email Address
  • kernel - In this case its KVM
  • noos - If you don't want to download the DomU operating system for the DomU then please add noos=true as a parameter
  • beta - If there is a newer version of Virtualizor available and you would like to test it then please add beta=true as a parameter
  • nested_virt - If you want to enable Nested Virtualization on your server then please add nested_virt=1 as a parameter. If you enable this, it will install a new kernel for enabling nested virtualization.
  • lvg (optional) - If you are going to use LVM for the VPS storage. The Volume Group that will be used for the DomU (VPS) storage e.g. defaults to VG. It should have some OR ALL unallocated space to create LVMs for the VPS.
  • interface - You can specify the default interface that you want to set. If not provided it will be considered as eth0.
  • license - In case you are installing Virtualizor on the internal network you will need to provide the VALID license key. To get the internal license key you will need to open a support ticket.

The installation will begin immediately. It may seem that the installation has stopped if your network speed is slow, but please let it continue. You will see something like this :

 Welcome to Softaculous Virtualizor Installer

1) Installing Libraries and Dependencies
2) Installing PHP, MySQL and Web Server
3) Downloading and Installing Virtualizor
                - Configuring Virtualizor
                - Fetching License
                - Setting up the CRON Job
                - Importing Database
                - Getting List of OS templates
                - Generating the SSL Certificates
4) Installing the Virtualization Kernel - kvm
                - You have not defined any storage ! Please add a Storage once you visit the Admin Panel.
        KVM Module has been installed 
 Installation Completed 
Congratulations, Virtualizor has been successfully installed
API KEY : havkrq0b8skwiaxgtpxh3rehxo9lhalu
API Password : j1zpjzzxzhbnuavxgu6nijbslan2wxj3 
You can login to the Virtualizor Admin Panel
using your ROOT details at the following URL :
You will need to reboot this machine to load the correct kernel 

After the installation is completed you will be asked to reboot.

You will need to reboot this machine to load the correct kernel
Do you want to reboot now ? [y/N] ┃ 

You can then visit the Admin Panel to create the Storage and the Virtual Servers and also manage your server. Note: A log file of the installation process will be created - /root/virtualizor.log


To login to the Softaculous Virtualizor Admin Panel, visit the following URL :



Login with the servers root details.


Admin Panel

After you log in, you will see the Admin Panel Dashboard :



Virtualizor uses ports from 4081 - 4085. If there is any firewall restricting this, you will need to allow these ports.

For RHEL & CentOS < 7

iptables -I INPUT 1 -p tcp -m tcp --dport 4081:4085 -j ACCEPT
iptables -I INPUT 2 -p tcp -m tcp --dport 5900:6000 -j ACCEPT

 For RHEL & CentOS 7+

firewall-cmd --zone=public --permanent --add-port=4081-4085/tcp 
firewall-cmd --zone=public --permanent --add-port=5900-6000/tcp 
firewall-cmd --reload

If you are going to use Webuzo templates for VM creation, please allow ports 2002-2005

Create Storage

Before creating any VMs, its necessary to define your storage. Navigate to Virtualizor Admin Panel -> Storage -> Add Storage
You will see the following wizard :


Fill in the details and define the storage.

If you are using RAID setup on your server, please create the VG from RAID disks (e.g. /dev/md1) and not from the actual disks (e.g /dev/sda1). Please note that disk names can be different as per your setup, the above explanation is just an example.

Virtualizor Network in KVM

By default, eth0 will be assumed as the Network Interface. To tell the Virtualizor to use anything other than Network Interface, You need to set it here.

You can change these settings any time from the Virtualizor Admin Panel -> Configuration -> Slave Settings. The following is a screenshot of the available settings :


will create a viifbr0 bridge.
viifbr0 detects the IP, Netmask, and GATEWAY from :

root> /etc/sysconfig/network-scripts/ifcfg-INTERFACE_NAME

Hence if you change the above file, you will need to restart the Virtualizor network :

root> service virtnetwork restart
This will restart your Network Services.

Start Command :

root> service virtnetwork start

Stop Command :

root> service virtnetwork stop

Trouble Shoot

Please check if your iptables firewall is running You can disable it with the following command if even after allowing ports, the panel is not working :

root> service iptables stop

For CentOS 7 :

root> systemctl stop firewalld
In all cases please remember to disable SElinux. The Virtualizor installer will try to disable it. For KVM make sure that VT is enabled from bios so VPS can be able to start.

Disk resize issue on Ubuntu 16 and Ubuntu 18

mv /sbin/sfdisk /sbin/sfdisk_new
wget -O /sbin/sfdisk
chmod 755 /sbin/sfdisk

For vps hostname/disk resize issues on Ubuntu 16.04 and Ubuntu 18.04 with sfdisk version 2.27.1 , follow these steps to downgrade sfdisk on the server.

Centos 8 issues

If you are facing issues with VNC on CentOS 8 server (even it being the Master-only panel) then make sure python is installed on your server :

root> yum list installed |grep python*

If it's not present, then try to install it

root> yum install python2

And if you do not see anything for

root> /usr/bin/python

Then you can symlink it and then check for vnc

root> ln -s /usr/bin/python2 /usr/bin/python
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