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kubevirt-minishift-demo

Overview

This repository contains helper scripts and YAML files to facilitate performing a simple demonstration of the KubeVirt project and related components including the Containerized Data Importer.

The demonstration environment is created using Minishift and is as a result appropriate for running on a single laptop.

Pre-requisites

Currently before running the demonstration script it is necessary to download and install:

  1. minishift
  2. kubectl
  3. virtctl

The host system must also be enabled for nested KVM. KubeVirt and the Containerized Data Importer will be installed by the demo scripts.

Usage

Execute demo.sh to create the base minishift environment:

$ ./demo.sh

This creates a new minishift environment and deploys KubeVirt as well as the Containerized Data Importer.

As pulling the images and starting them takes some time, particularly on conference wifi, this is typically a step to perform before the demonstration so that time is focused instead on what the resultant setup can actually do.

Once the system is ready, use the provided YAML files to (re)create the examples in the kubevirt-demo namespace that will be selected when demo.sh ends. To clean-up the examples you can use clean.sh. This will only remove newly created entities generated from the YAML files in the current namespace. It will not clean up the MiniShift instance or other KubeVirt entities like the CRDs.

Inventory

The following examples use the Cirros disk image and are found in ./examples/cirros/:

  • cirros-vm.yaml - Create a basic Cirros virtual machine using a RegistryDisk, pulls image from Docker Hub.
  • cirros-pvc.yaml - Create a PersistentVolume containing a Cirros disk image using the Containerized Data Importer, img file pulled via HTTP.
  • cirros-pvc-vm.yaml - Create a basic Cirros virtual machine using a PersistentVolume.
  • cirros-clone-pvc.yaml - Create a clone of the PersistentVolume created by cirros-pvc.yaml using the Containerized Data Importer.
  • cirros-clone-vm.yaml - Create a virtual machine based on the cloned PersistentVolume from cirros-clone-pvc.yaml.

The fedora-* examples in ./examples/fedora/ follow the same pattern as the Cirros examples above. In both the Cirros and Fedora examples the resultant virtual machine has basic networking provided by the Pod network. The Cirros image uses the default username and password baked into it (cirros and gocubsgo), the Fedora image uses the shadowman user with the shadowman password.

Basic KubeVirt Demo Flow

Once the environment is operational, it is ready for demonstration. A typical basic flow looks something like this:

  1. Examine the kube-system namespace illustrating the presence of the KubeVirt components.
  2. Use kubectl create -f examples/cirros/cirros-vm.yaml to create a basic Cirros virtual machine based on a RegistryDisk.
  3. Use kubectl get vms to illustrate kubectl can see the vm object.
  4. Use kubectl edit vm cirros-vm or virtctl start cirros-vm to create the VirtualMachineInstance.
  5. Use kubectl get vmis to illustrate the presence of the VM instance.
  6. Use kubectl describe vmi cirros-vm to see the scheduling state of the virtual machine instance.
  7. Use virtctl console cirros-vm to access the console of the virtual machine instance.

Basic KubeVirt + Containerized Data Importer Demo Flow

The Containerized Data Importer allows us to demonstrate spawning a virtual machine that uses a PersistentVolume instead of a RegistryDisk.

  1. Use kubectl create -f examples/cirros/cirros-pvc.yaml to create the Cirros PersistentVolume.
  2. Use watch -n 2 kubectl logs <pod> to illustrate the state of the import process.
  3. Use kubectl create -f examples/cirroscirros-pvc-vm.yaml to create a basic Cirros virtual machine based on a PersistentVolume.
  4. Use kubectl create -f examples/cirroscirros-clone-pvc.yaml to demonstrate cloning a volume.
  5. Use kubectl create -f examples/cirros/cirros-clone-vm.yaml to demonstrate spawning a virtual machine from the cloned volume.