Install & Manage KVMs in RHEL 8 (CentOS 8) | Running Virtual Machines in RHEL 8 | Nehra Classes



Install & Manage KVMs in RHEL 8 (CentOS 8) | Running Virtual Machines in RHEL 8 | Nehra Classes

Install & Manage KVMs in RHEL 8 (CentOS 8) | Running Virtual Machines in RHEL 8 | Nehra Classes

Install & Manage KVMs in RHEL 8 (CentOS 8) | Running Virtual Machines in RHEL 8 | Nehra Classes
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Kernel-based Virtual Machine (KVM) is an open-source and de facto standard virtualization solution that is tightly integrated into Linux.

It is a loadable kernel module that turns Linux into a type-1 (bare-metal) hypervisor that creates a virtual operating platform used to run virtual machines (VMs).

# grep -e ‘vmx’ /proc/cpuinfo
# grep -e ‘svm’ /proc/cpuinfo

Also, confirm that KVM modules are loaded in the kernel (they should be, by default).

# lsmod | grep kvm

Step 1: Setup Cockpit Web Console on CentOS 8
# dnf install cockpit cockpit-machines

2. When the package installation is complete, start the cockpit socket, enable it to auto-start at system boot and check its status to confirm that it is up and running.
# systemctl start cockpit.socket
# systemctl enable cockpit.socket
# systemctl status cockpit.socket

3. Next, add the cockpit service in the system firewall which is enabled by default, using the firewall-cmd command and reload the firewall configuration to apply the new changes.
# firewall-cmd –add-service=cockpit –permanent
# firewall-cmd –reload

4. To access the cockpit web console, open a web browser and use the following URL to navigate.
https://FQDN:9090/
OR
https://SERVER_IP:9090/

5. Next, install the virtualization module and other virtualization packages as follows.
# dnf module install virt
# dnf install virt-install virt-viewer

6. Next, run the virt-host-validate command to validate if the host machine is set up to run libvirt hypervisor drivers.
# virt-host-validate

7. Next, start the libvirtd daemon (libvirtd) and enable it to start automatically on each boot.
# systemctl start libvirtd.service
# systemctl enable libvirtd.service
# systemctl status libvirtd.service

8. Now create a network bridge (virtual network switch) to integrate virtual machines to the same network as the host.

9. From the pop-up window, enter the bridge name and select the bridge slaves or port devices (e.g enp2s0 representing the Ethernet interface) as shown in the following screenshot. Then click Apply.

10. Now when you look at the list of Interfaces, the new bridge should appear there and after a few seconds, the Ethernet interface should be disabled (taken down).

Step 4: Creating and Managing Virtual Machines via Cockpit Web Console
11. From the cockpit main interface, click on the Virtual Machines option as highlighted in the following screenshot. From the Virtual Machines page, click on Create VM.

12. A window with options to create a new VM will display. Enter the Connection, Name (e,g ubuntu18.04), Installation Source Type (on the test system, we have stored ISO images under the storage pool i.e /var/lib/libvirt/images/). Also check the option to immediately start the VM, then click Create.

13. After clicking Create from the previous step, the VM should be automatically started and it should boot using the ISO image provided. Proceed to install the guest operating system (Ubuntu 18.04 in our case).

If you click on Network Interfaces of the VM, the network source should indicate the newly created bridge network interface.

And during the installation, at the step of configuring a network interface, you should be able to notice that the VMs Ethernet interface receives an IP address from the DHCP server of the host network.

14. When the guest OS installation is complete, reboot the VM, then go to Disks and detach/remove the cdrom device under the VMs disks. Then click Run to start the VM.

15. Now under Consoles, you can log into the guest OS using a user account you created during the installation of the OS.

Step 5: Accessing a Virtual Machine Guest OS via SSH.
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