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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Linux
高级联网
｜
407
A.3.3
在网络名称空间中加入接口
在默认情况下，与联网相关的所有对象和配置都属于“默认”网络名称空间（也称为
“
netns 0
”
）。同样，在默认情况下，新创建的网络名称空间不包含网络接口。因此，新创建
的网络名称空间没有任何网络连接：与默认名称空间没有连接、与外界没有连接、与所有
一切都没有连接。为了解决这个问题，需要为名称空间添加一个接口。
使用
ip link
命令（该命令假定名称空间
blue
已经创建好了）可以为网络名称空间加入接口。
vagrant@jessie:~$
ip link set eth1 netns blue
vagrant@jessie:~$
从这个例子中可以看出，为名称空间加入接口的命令的语法为
ip link set
interface-name
netns
namespace-name
。
一旦将接口加入名称空间，该接口就从默认名称空间中消失了。这合情合理，因为一个接
口在任意时刻只能存在于单个名称空间中。例如，考虑图
A-1
和图
A-2
。图
A-1
展示了
ip
link list
在配备了两个物理网络接口（
ens32
和
ens33
）的
CentOS 7
系统中的输出。
图 A-1：为名称空间分配接口前的接口列表
图
A-2
展示了将同样的
CentOS 7
系统的其中一个物理网络接口移入另一个网络名称空间
之后
的
ip link list
的输出。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.