为什么要创建私有网络？

当然是为了隔离一些服务，用这种环境来测试某些服务了！

准备工作

查看 kvm 现有的网络：

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$ virsh net-list --all
 Name      State    Autostart   Persistent
--------------------------------------------
 default   active   yes         yes

新建网络

1.复制默认的网桥配置文件：

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$ sudo cp /etc/libvirt/qemu/networks/default.xml /etc/libvirt/qemu/networks/mynet.xml

2.编辑新的网络配置文件，修改如下：

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<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh net-edit mynet
or other application using the libvirt API.
-->

<network>
  <name>mynet</name>
  <uuid>9c8eca23-2268-4aa8-b754-a8d4d131d826</uuid>
  <bridge name='virbr1' stp='on' delay='0'/>
  <mac address='52:54:00:7d:f5:2d'/>
  <ip address='192.168.137.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.137.2' end='192.168.137.254'/>
    </dhcp>
  </ip>
</network>

3.加载私有网络：

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$ sudo virsh net-define /etc/libvirt/qemu/networks/mynet.xml
Network mynet defined from /etc/libvirt/qemu/networks/mynet.xml

4.再次查看网络：

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$ sudo virsh net-list --all
 Name      State      Autostart   Persistent
----------------------------------------------
 default   active     yes         yes
 mynet     inactive   no          yes