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<!DOCTYPE HTML>
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<head>
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<title>依赖反转 · GitBook</title>
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<li class="chapter " data-level="1.1" data-path="./">
<a href="./">
Introduction
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<li class="chapter " data-level="1.2" data-path="1.Terraform初步体验.html">
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Terraform初步体验
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<span>
Terraform基础概念
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状态管理
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局部值
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数据源
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表达式
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代码风格规范
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创建模块
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使用模块
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Terraform命令行
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命令行配置文件
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环境变量
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资源地址
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apply
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console
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destroy
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fmt
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force-unlock
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get
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graph
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import
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init
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output
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plan
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providers
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refresh
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mv
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pull
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rm
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show
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taint
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validate
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untaint
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workspace
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list
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select
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new
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delete
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Aha
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有条件创建
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依赖反转
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多可用区分布
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provisioner与user_data
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后记
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<h1 id="依赖反转">依赖反转</h1>
<p>Terraform编排的基础设施对象彼此之间可能互相存在依赖关系，有时我们在编写一些旨在重用的模块时，模块内定义的资源可能本身需要依赖其他一些资源，这些资源可能已经存在，也可能有待创建。</p>
<p>举一个例子，假设我们编写了一个模块，定义了在UCloud上同一个Vpc中的两台服务器；第一台服务器部署了一个Web应用，它被分配在一个联通公网的DMZ子网里；第二台服务器部署了一个数据库，它被分配在一个内网子网里。现在的问题是，在我们编写模块时，我们并没有关于Vpc和子网的任何信息，我们甚至连服务器应该部署在哪个可用区都不知道。Vpc和子网可能已经存在，也可以有待创建。</p>
<p>我们可以定义这样的一个模块代码：</p>
<pre class="language-"><code class="lang-hcl"><span class="token keyword">terraform</span> <span class="token punctuation">{</span>
<span class="token keyword">required_providers</span> <span class="token punctuation">{</span>
<span class="token property">ucloud</span> <span class="token punctuation">=</span> <span class="token punctuation">{</span>
<span class="token property">source</span> <span class="token punctuation">=</span> <span class="token string">"ucloud/ucloud"</span>
<span class="token property">version</span> <span class="token punctuation">=</span> <span class="token string">"~>1.22.0"</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">variable<span class="token type variable"> "network_config" </span></span><span class="token punctuation">{</span>
<span class="token property">type</span> <span class="token punctuation">=</span> object(<span class="token punctuation">{</span>
<span class="token property">vpc_id</span> <span class="token punctuation">=</span> string
<span class="token property">web_app_config</span> <span class="token punctuation">=</span> object(<span class="token punctuation">{</span>
<span class="token property">az</span> <span class="token punctuation">=</span> string
<span class="token property">subnet_id</span> <span class="token punctuation">=</span> string
<span class="token punctuation">}</span>)
<span class="token property">db_config</span> <span class="token punctuation">=</span> object(<span class="token punctuation">{</span>
<span class="token property">az</span> <span class="token punctuation">=</span> string
<span class="token property">subnet_id</span> <span class="token punctuation">=</span> string
<span class="token punctuation">}</span>)
<span class="token punctuation">}</span>)
<span class="token punctuation">}</span>
<span class="token keyword">data <span class="token type variable">"ucloud_images"</span></span> <span class="token string">"web_app"</span> <span class="token punctuation">{</span>
<span class="token property">name_regex</span> <span class="token punctuation">=</span> <span class="token string">"^WebApp"</span>
<span class="token punctuation">}</span>
<span class="token keyword">data <span class="token type variable">"ucloud_images"</span></span> <span class="token string">"mysql"</span> <span class="token punctuation">{</span>
<span class="token property">name_regex</span> <span class="token punctuation">=</span> <span class="token string">"^MySql 5.7"</span>
<span class="token punctuation">}</span>
<span class="token keyword">resource <span class="token type variable">"ucloud_instance"</span></span> <span class="token string">"web_app"</span> <span class="token punctuation">{</span>
<span class="token property">availability_zone</span> <span class="token punctuation">=</span> var.network_config.web_app_config.az
<span class="token property">image_id</span> <span class="token punctuation">=</span> data.ucloud_images.web_app.images<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span>.id
<span class="token property">instance_type</span> <span class="token punctuation">=</span> <span class="token string">"n-basic-2"</span>
<span class="token property">vpc_id</span> <span class="token punctuation">=</span> var.network_config.vpc_id
<span class="token property">subnet_id</span> <span class="token punctuation">=</span> var.network_config.web_app_config.subnet_id