How to install KVM on RHEL 8 / CentOS 8?. This guide will cover the full installation of KVM hypervisor and its management tools on RHEL 8 / CentOS 8. KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux Systems running on x86 hardware with virtualization extensions (Intel VT or AMD-V).
KVM consists of a loadable kernel module,
kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. Follow the steps below to install KVM on your RHEL 8 server.
Install KVM on RHEL 8 / CentOS 8
The next sections will take you through the steps to install the latest release of KVM hypervisor on RHEL 8. This will include the installation of KVM management tools –
Step 1: Ensure host CPU has Intel VT or AMD-V Virtualization extensions
The first step is to verify your CPU support for Intel VT or AMD-V Virtualization extensions. In some systems, this is disabled on BIOS and you may need to enable it.
$ cat /proc/cpuinfo | egrep "vmx|svm"
You can also do the same with
$ lscpu | grep Virtualization Virtualization: VT-x
Step 2: Install KVM / QEMU on RHEL/ CentOS 8
KVM packages are distributed on RHEL 8 via AppStream repository. Install KVM on your RHEL 8 server by running the following commands:
sudo yum update sudo yum install @virt
After installation, verify that Kernel modules are loaded
$ lsmod | grep kvm kvm_intel 233472 0 kvm 737280 1 kvm_intel
Also install useful tools for virtual machine management.
sudo dnf -y install virt-top libguestfs-tools
We have a guide on how to use
Step 3: Start and enable KVM daemon
By default, KVM daemon
libvirtd is not started, start the service using the command:
sudo systemctl enable --now libvirtd
Step 4: Install Virtual machine Manager GUI – Optional
If you have a Desktop Environment on your RHEL 8, you can install the
virt-manager tool which allows you to manage Virtual Machines from a GUI.
sudo yum -y install virt-manager
Step 5: Create a VM instance on KVM
Once you have your bridge interface ready, create a test instance using CLI or Virtual Machine Manager. The example below is for creating a Fedora 29 VM.
virt-install --name fed29 --ram 1024 --vcpus 1 --disk path=/var/lib/libvirt/images/fed29.img,size=20 --os-variant fedora29 --os-type linux --network bridge=br0 --graphics none --console pty,target_type=serial --location 'http://fedora.inode.at/releases/29/Server/x86_64/os/' --extra-args 'console=ttyS0,115200n8 serial'
The installation is on text mode but the procedure of installation is similar to GUI. After finishing the installation, reboot the instance and login
Fedora 29 (Server Edition) Kernel 4.18.16-300.fc29.x86_64 on an x86_64 (ttyS0) Web console: https://localhost:9090/ or https://192.168.10.11:9090/ localhost login:
You can also login through console:
$ virsh console fed29
Press <ENTER> key on getting:
Escape character is ^]