[root@localhost ~]# grep -P "vmx|svm" /proc/cpuinfo
flags        : ... ... vmx
[root@localhost ~]# lsmod |grep kvm
kvm_intel             174841  6 
kvm                   578518  1 kvm_intel
irqbypass              13503  1 kvm

[root@localhost ~]# yum install -y qemu-kvm                                    libvirt-daemon                                    libvirt-daemon-driver-qemu                                    libvirt-client
[root@localhost ~]# systemctl enable --now libvirtd
[root@localhost ~]# virsh version

[root@localhost ~]# vim /etc/libvirt/qemu/networks/vbr.xml
<network>
  <name>vbr</name>
  <forward mode=‘nat‘/>
  <bridge name=‘vbr‘ stp=‘on‘ delay=‘0‘/>
  <ip address=‘192.168.100.254‘ netmask=‘255.255.255.0‘>
    <dhcp>
      <range start=‘192.168.100.100‘ end=‘192.168.100.200‘/>
    </dhcp>
  </ip>
</network>

[root@localhost ~]# cd /etc/libvirt/qemu/networks/
[root@localhost ~]# virsh net-define vbr.xml
[root@localhost ~]# virsh net-start vbr
[root@localhost ~]# virsh net-autostart vbr
[root@localhost ~]# ifconfig # 查看验证

[root@localhost ~]# cp cirros.qcow2 /var/lib/libvirt/images/
[root@localhost ~]# cd /var/lib/libvirt/images/通过 qemu-img 创建虚拟机磁盘

[root@localhost ~]# qemu-img create -f qcow2 -b cirros.qcow2 vmhost.img 30G
[root@localhost ~]# qemu-img info vmhost.img #查看信息

[root@localhost ~]# cp node_base.xml /etc/libvirt/qemu/vmhost.xml
[root@localhost ~]# vim /etc/libvirt/qemu/vmhost.xml
<name>vmhost</name>
<memory unit=‘KB‘>1024000</memory>
<currentMemory unit=‘KB‘>1024000</currentMemory>
<vcpu placement=‘static‘>2</vcpu>
<source file=‘/var/lib/libvirt/images/vmhost.img‘/>

[root@localhost ~]# virsh list
[root@localhost ~]# virsh define /etc/libvirt/qemu/vmhost.xml
[root@localhost ~]# virsh start vmhost
[root@localhost ~]# virsh console vmhost # 两次回车
退出使用 ctrl + ]