Deckhouse Platform integrates with the built-in virtualization infrastructure and uses DVPInstanceClass resources to define the characteristics of virtual machines created as part of the cluster.

Key features:

  • Management of built-in virtualization resources via the cloud-controller-manager module
  • Provisioning of disks using the CSI storage component
  • Integration with the node-manager module to support DVPInstanceClass when defining a NodeGroup

The virtualization integration is enabled automatically for all cloud clusters deployed in built-in virtualization. No additional configuration is required.

Load balancers

Virtualization supports Service objects of the LoadBalancer type. For every such object, cloud-controller-manager creates a LoadBalancer Service in the parent cluster and directs traffic to the nodes of the child one. The object is created in the namespace set by the namespace parameter, next to the cluster virtual machines.

The external address is assigned by the parent cluster, so a balancer controller must run there, for example the metallb module. The controller serves only those Service objects that have a resolved balancer class.

To set the default class, create a MetalLoadBalancerClass resource in the parent cluster with the isDefault parameter set to true. Such a class serves the Service objects with no class specified, so you can leave the class out in the child cluster.

To pick another class, set it in the spec.loadBalancerClass parameter of the Service object in the child cluster. The platform copies the value to the parent cluster along with the externalIPs parameter and the deprecated loadBalancerIP parameter.

The spec.loadBalancerClass parameter is immutable. Set the class when creating the Service object, otherwise the object has to be recreated.

With no balancer class, the Service object stays in the Pending state, and cloud-controller-manager reports no errors. Check the state of the object in the parent cluster:

d8 k -n <NAMESPACE> get svc

Replace <NAMESPACE> with the namespace set by the namespace parameter.

Additional resources