oVirt is a virtual datacenter manager that delivers powerful management of multiple virtual machines on multiple hosts. Using KVM and libvirt, oVirt can be installed on Fedora, CentOS, or Red Hat Enterprise Linux hosts to set up and manage your virtual data center.
The oVirt cloud provider allows to easily discover and automatically add new VM instances as nodes to your Kubernetes cluster. At the moment there are no community-supported or pre-loaded VM images including Kubernetes but it is possible to import or install Project Atomic (or Fedora) in a VM to generate a template. Any other distribution that includes Kubernetes may work as well.
It is mandatory to install the ovirt-guest-agent in the guests for the VM ip address and hostname to be reported to ovirt-engine and ultimately to Kubernetes.
Once the Kubernetes template is available it is possible to start instantiating VMs that can be discovered by the cloud provider.
The oVirt Cloud Provider requires access to the oVirt REST-API to gather the proper information, the required credential should be specified in the
[connection] uri = https://localhost:8443/ovirt-engine/api username = admin@internal password = admin
In the same file it is possible to specify (using the
filters section) what search query to use to identify the VMs to be reported to Kubernetes:
[filters] # Search query used to find nodes vms = tag=kubernetes
In the above example all the VMs tagged with the
kubernetes label will be reported as nodes to Kubernetes.
ovirt-cloud.conf file then must be specified in kube-controller-manager:
kube-controller-manager ... --cloud-provider=ovirt --cloud-config=/path/to/ovirt-cloud.conf ...
This short screencast demonstrates how the oVirt Cloud Provider can be used to dynamically add VMs to your Kubernetes cluster.
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