Building Images for OpenStack

Hypervisor

The image is built using KVM hypervisor.

Prerequisites for QCOW2

Execute the following command to install qemu-kvm and other packages if you are running Ubuntu 18.04 LTS.

Installing packages to use qemu-img

$ sudo -i
# apt install qemu-kvm libvirt-bin qemu-utils

If you’re on Ubuntu 20.04 LTS, then execute the following command to install qemu-kvm packages.

$ sudo -i
# apt install qemu-kvm libvirt-daemon-system libvirt-clients virtinst cpu-checker libguestfs-tools libosinfo-bin

Adding your user to the kvm group

$ sudo usermod -a -G kvm <yourusername>
$ sudo chown root:kvm /dev/kvm

Then exit and log back in to make the change take place.

Building Images

The build prerequisites for using image-builder for building qemu images are managed by running:

cd image-builder/images/capi
make deps-qemu

From the images/capi directory, run make build-qemu-ubuntu-xxxx. The image is built and located in images/capi/output/BUILD_NAME+kube-KUBERNETES_VERSION. Please replace xxxx with 2004 or 2204 depending on the version you want to build the image for.

To build a Ubuntu 22.04-based CAPI image, run the following commands -

$ git clone https://github.com/kubernetes-sigs/image-builder.git
$ cd image-builder/images/capi/
$ make build-qemu-ubuntu-2204

The Image Builder Book