January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
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402
｜
附录
A
本节要讨论以下两种
VM
联网配置。
•
使用
Linux
网桥联网
VM
。
•
使用
macvtap
接口联网
VM
。
先从使用
Linux
网桥开始。
A.2.1
使用
Linux
网桥
通过
Linux
主机的一个（或多个）物理接口将
VM
桥接到物理网络上是
Linux
网桥十分常
见的用例。事实上，这是第
3
章在首次介绍
Linux
网桥时使用的例子之一。本节将略微详
细地介绍一下它的工作原理。
当使用
KMV
和
Libvirt
通过网桥联网
VM
时，会涉及一些不同的组件。
• Linux
网桥（显而易见）
• Libvirt
虚拟网络，告诉
Libvirt
要使用哪个
Linux
网桥
•
虚拟网络接口
• KVM
访客域（名词“域”用于引指运行在
KVM
上的
VM
）
下面来看看这些组件是如何相互配合的。
一般来说
，我们要做的第一件事是使用
Libvirt
创建一个虚拟网络
。
（通过一些
XML
来定
义，如果不熟悉
XML
也没关系，可以参考第
5
章
。）虚拟网络是
Libvirt
用来引指特定底
层网络配置的一种抽象。底层网络配置既可以是网桥（就像本例中一样），也可以是某些
其他配置（下一节会介绍）。
Libvirt
会使用
XML
来定义包括虚拟网
络在内的抽象。下列
XML
代码会创建出一个名为
network-br0
的虚
拟网络来引用
Linux
网桥
br0
。注意，应该由系统管理员使用第
3
章中介
绍的操作过程和命令来创建
br0
，并将物理接口与该网桥关联。
<network>
<name>
network-br0
</name>
<forward
mode="bridge"
/>
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.