Setting Up the libvirt Provider

Set up an Oracle Linux host to create Kubernetes clusters using the libvirt provider.

Clusters can be created on the localhost, or on a remote system. Perform these steps on the system to be used to create the cluster, whether that's the localhost for local clusters, or on a remote host if you're creating clusters on a remote system.

Install the Oracle KVM stack.

Oracle Linux 9:

If you have an existing installation of the default KVM stack, remove it:

sudo dnf remove libvirt qemu-kvm edk2

Install the Oracle KVM stack:

sudo dnf config-manager --enable ol9_kvm_utils
sudo dnf group install "Virtualization Host"
sudo dnf install virt-install virt-viewer

Start the virtualization daemons.

for drv in qemu network nodedev nwfilter secret storage interface proxy   
  do
   sudo systemctl enable virt${drv}d.service
   sudo systemctl enable virt${drv}d{,-ro,-admin}.socket
   sudo systemctl start virt${drv}d{,-ro,-admin}.socket 
  done

Oracle Linux 8:

If you have an existing installation of the default KVM stack, remove it:

sudo dnf module remove virt --all
sudo dnf module reset virt

Install the Oracle KVM stack:

sudo dnf config-manager --enable ol8_kvm_appstream
sudo dnf module enable virt:kvm_utils3 
sudo dnf --allowerasing distro-sync
sudo dnf module install virt:kvm_utils3

Enable and start the libvirtd.service:

sudo systemctl enable --now libvirtd.service

For more information on installing and configuring KVM, see the Oracle Linux: KVM User's Guide.

Validate the host.
Validate the host is set up for hardware virtualization, and can be used as a KVM host:
```
virt-host-validate qemu
```
Configure the user.
Configure the user to have privileged access to libvirt, add the user to the libvirt and qemu groups.
```
sudo usermod -a -G libvirt,qemu $USER
```
To enable the change to the user, log out, and log back into the host or terminal session.
(Optional) Open a range of ports in the firewall.
If you're installing libvirt on a remote host, open a series of firewall ports so you can access nodes in the cluster from the localhost. You don't need to do this if you're installing libvirt on the localhost. Use the format:
```
sudo firewall-cmd --add-port 6443-endrange/tcp
sudo firewall-cmd --add-port 6443-endrange/tcp --permanent
```
Replace endrange with the highest port number you want to open. For example, to open 20 ports, use:
```
sudo firewall-cmd --add-port 6443-6463/tcp
sudo firewall-cmd --add-port 6443-6463/tcp --permanent
```
Restart firewalld.service
```
sudo systemctl restart firewalld.service
```
(Optional) Set up proxy configuration.
If you use a proxy server, configure the libvirt host so container images can be pulled from the Oracle Container Registry using HTTPS. For example:
```
export HTTPS_PROXY=https://proxy.example.com:3128
```