Skip to main content

Update VM Configuration

You can add storage and additional network interfaces to your virtual machines (VMs).

Add Disk Storage​

KubeVirt allows hot plugging additional storage into a running VM. Both block and file system volume types are supported.

Prerequisites​

  • A deployed VM.

Add a Disk​

  1. Log in to Palette.
  1. From the left Main Menu, click Clusters and click on your cluster.
  1. Navigate to Virtual Machines > Disks tabs and click the Add disk button.

  1. Review the parameters and update as needed. You can specify the disk size, disk type (Disk, CD-ROM, or LUN), and network interface.

    The interface type determines out-of-the-box operating system (OS) support and disk performance. Choose from the following:


    • virtio: Optimized for best performance, but the operating system may require additional Virtio drivers.

    • sata: Most operating systems support Serial ATA (SATA). However it offers lower performance.

    • scsi: A paravirtualized Internet Small Computer System Interface (iSCSI) HDD driver that offers similar functionality to the virtio-block device but with some additional enhancements. In particular, this driver supports adding hundreds of devices and names devices using the standard SCSI device naming scheme.
  1. Click Add when you are done.

Validate​

The Disks tab lists the newly added disk as PersistingHotplug.


Add Network Interfaces​

You can add additional network interfaces to a VM. By default, VMs use the native networking already configured in the pod. Typically, this means using the Bridge option, and your VM has the same IP address as the pod. This approach makes interoperability possible. The VM can integrate with different cases like sidecar containers and pod masquerading.

When using pod masquerading, you choose a CIDR for which VMs are not assigned a private IP, and instead use Network Address Translation (NAT) behind the pod IP.

Multus is a secondary network that uses Multus-CNI. Multus allows you to attach multiple network interfaces to pods in Kubernetes. If you use Multus as your network, ensure that Multus is installed across your cluster and that you have created a default NetworkAttachmentDefinition CRD. For more information, refer to the Multus CNI guide.

Prerequisites​

  • A deployed VM.

Add an Interface​

  1. Log in to Palette.
  1. From the left Main Menu, click Clusters and click on your cluster.
  1. Navigate to Virtual Machines > Network Interfaces and click the Add network interface button.
  1. Review the parameters and update as needed. Interface types are: Masquerade, Bridge, and SR-IOV.
  1. Click Add when you are done.

info

Multus allows hot plugging network interfaces only when interfaces use the virtio model connected through bridge binding.

Validate​

The Network Interfaces tab lists the newly added interface.

Resources