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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406
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附录
A
A.3.1
网络名称空间用例
网络名称空间都有哪些用例？下面是其中一些用例。
每进程（per-process）路由
在自己的网络名称空间中运行进程，可以在每进程的基础上配置路由。
启用 VRF 配置
本节在开始的时候提到过，在网络世界中，与
VRF
实例最紧密相关的可能就是网络名
称空间了，所以启用类似于
VRF
的配置自然是网络名称空间的主要用例。
支持重叠的 IP 地址空间
也可以使用网络名称空间来为重叠的
IP
地址空间提供支持
，在这种情况下
，同一个地
址（或地址范围）可用于不同目的并具有不同的意义。从更宏观的层面来看，你可能
需要将其与叠加（
overlay
）网络或网络地址转换（
N
AT
）结合使用来充分支持这样的
用例。
下面来看看如何创建和删除网络名称空间。
A.3.2
创建和删除网络名称空间
创建网络名称空间非常简单。所用的工具还是
iproute2
包中的
ip
命令，这次要用到的是
netns
子命令。
创建网络名称空间命令的语法为
ip netns add
namespace-name
。假设想创建一个名为
blue
的网络名称空间。
[vagrant@centos ~]$
ip netns add blue
[vagrant@centos ~]$
注意，命令执行成功后没有任何反馈信息。要想验证名称空间是否已添加，需要使用
ip
netns list
。
[vagrant@centos ~]$
ip netns list
blue
[vagrant@centos ~]$
删除网络名称空间也很简单。
[vagrant@centos ...
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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.