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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18
｜
第
2
章
!
hostname {{ inventory_hostname }}
ip domain-name {{ domain_name }}
!
!
{% for vlan in vlans %}
vlan {{ vlan.id }}
name {{ vlan.name }}
{% endfor %}
!
在这个例子中，
双花括号
表示
Jinja
变量。换句话说，在使用数据渲染模板时，此处会插
入数据变量的值。因为双花括号表示变量，而模板中并没有对应的变量值，所以必须将它
保存在别处。为此，需要再次选用
Y
AML
文件。也可以选择使用脚本代替平面
YAML
文
件，从网络管理系统（
Network Management
System
，
NMS
）或
IP
地址管理（
IP Address
Management
，
IP
AM
）系统等外部系统载入这类信息。
在这个例子中，如果操控
VLAN
的团队想为网络设备添加一个
VLAN
，是没问题的
。只需
要改动变量文件，使用
Ansible
或其他渲染引擎（
Salt
、纯
Python
等）生成新的配置文件。
第
6
章会介绍如何使用原生
Python
与
Jinja
模板，展示如何创建可用作基础
渲染引擎的
Python
脚本。
到这一步，只要生成了配置，就需要将其
推送
至网络设备。具体的
推送
和
执行
过程不在此
叙述，因为实现方式有很多，包括厂商专有的零接触配给（
zero touch provisioning
）解决
方案，以及其他一些方法，第
7
章和第
9
章会对此进行详述。
另外，这里只是对模板做一般性的介绍，如果看不明白 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.