给kubevirt创建虚拟机镜像
安装kubevirt之后需要制作虚拟机，目前官方文档太简洁不易看懂，这里翻出以前用过的文档
（1）registryDisk 方式
kubevirt提供了registryDisk的base docker image registry-disk-v1alpha
1 . 准备raw或者qcow2格式的虚拟机镜像，例如Windows---server-2012-datacenter-64bit-cn-syspreped---2018-01-15.qcow2
2 . 创建Dockerfile
FROM kubevirt/registry-disk-v1alpha
MAINTAINER "MinMin" <rmm0811@gmail.com># Add alpine image COPY Windows---server-2012-datacenter-64bit-cn-syspreped---2018-01-15.qcow2 /disk/windows2012dc.img
3 . 创建image
docker build -t windows2012dc:latest ./ docker push windows2012dc:latest
（1）使用pvc方式
kubevirt还未支持blockmode PVC，此处仅介绍file方式的。kubevirt中创建虚拟机是以pod空间中的/disk/目录下，那么意味着需要将PVC实现进行文件系统格式化，并创建disk/目录将 虚拟机root disk image拷贝至disk目录中
cat >Dockerfile <<EOF FROM kubevirt/container-disk-v1alpha ADD fedora32.qcow2 /disk/ EOF
docker build -t kubevirt/fedora-sriov-testing:latest .
一个可用的虚拟机模板：
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
name: centos
spec:
running: false
template:
metadata:
labels:
kubevirt.io/size: small
kubevirt.io/domain: centos
spec:
domain:
devices:
disks:
- disk:
bus: virtio
name: rootfs
- name: emptydisk
disk:
bus: virtio
- name: host-disk
disk:
bus: virtio
- disk:
bus: virtio
name: cloudinit
interfaces:
- name: default
bridge: {}
resources:
requests:
memory: 512M
networks:
- name: default
pod: {}
volumes:
- name: rootfs
containerDisk:
image: heishui/centos:new
- name: emptydisk
emptyDisk:
capacity: "20Gi"
- hostDisk:
capacity: "20Gi"
path: /data/disk.img
type: DiskOrCreate
name: host-disk
- name: cloudinit
cloudInitNoCloud:
userData: |-
#cloud-config
password: centos
chpasswd: { expire: False }