建个虚拟主机软件

# 安装KVM和相关工具
sudo apt-get update
sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils

# 创建虚拟机磁盘镜像
qemu-img create -f qcow2 ubuntu.qcow2 20G

# 创建虚拟机配置文件
virsh edit ubuntu

# 在配置文件中添加以下内容
<domain type='kvm'>
  <name>ubuntu</name>
  <memory unit='KiB'>2048</memory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.9'>hvm</type>
    <boot dev='hd'/>
  </os>
  <devices>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/ubuntu.qcow2'/>
      <target dev='vda' bus='virtio'/>
    </disk>
    <interface type='network'>
      <mac address='52:54:00:73:3d:58'/>
      <source network='default'/>
      <model type='virtio'/>
    </interface>
  </devices>
</domain>

# 启动虚拟机
virsh start ubuntu