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<h1 id="有条件创建">有条件创建</h1>
<p>Terraform被设计成声明式而非命令式，例如没有常见的if条件语句，后来才加上了count和for_each实现的循环语句(但循环的次数必须是在plan阶段就能够确认的，无法根据其他resource的输出动态决定)</p>
<p>有时候我们需要根据某种条件来判断是否创建一个资源。虽然我们无法使用if来完成条件判断，但我们还有count和for_each可以帮助我们完成这个目标。</p>
<p>我们以UCloud为例，假如我们正在编写一个旨在被复用的模块，模块的逻辑要创建一台虚拟机，我们的代码可以是这样的：</p>
<pre class="language-"><code class="lang-hcl">data ucloud_vpcs <span class="token string">"default"</span> <span class="token punctuation">{</span>
<span class="token property">name_regex</span> <span class="token punctuation">=</span> <span class="token string">"^Default"</span>
<span class="token punctuation">}</span>
<span class="token keyword">data <span class="token type variable">"ucloud_images"</span></span> <span class="token string">"centos"</span> <span class="token punctuation">{</span>
<span class="token property">name_regex</span> <span class="token punctuation">=</span> <span class="token string">"^CentOS 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"</span> <span class="token punctuation">{</span>
<span class="token property">availability_zone</span> <span class="token punctuation">=</span> <span class="token string">"cn-bj2-02"</span>
<span class="token property">image_id</span> <span class="token punctuation">=</span> data.ucloud_images.centos.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 punctuation">}</span>
<span class="token keyword">output<span class="token type variable"> "uhost_id" </span></span><span class="token punctuation">{</span>
<span class="token property">value</span> <span class="token punctuation">=</span> ucloud_instance.web.id
<span class="token punctuation">}</span>
</code></pre>
<p>非常简单。但是如果我们想进一步，让模块的调用者决定创建的主机是否要搭配一个弹性公网IP该怎么办？</p>
<p>我们可以在上面的代码后面接上这样的代码：</p>
<pre class="language-"><code class="lang-hcl"><span class="token keyword">variable<span class="token type variable"> "allocate_public_ip" </span></span><span class="token punctuation">{</span>
<span class="token property">description</span> <span class="token punctuation">=</span> <span class="token string">"Decide whether to allocate a public ip and bind it to the host"</span>
<span class="token property">type</span> <span class="token punctuation">=</span> bool
<span class="token property">default</span> <span class="token punctuation">=</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span>
<span class="token keyword">resource <span class="token type variable">"ucloud_eip"</span></span> <span class="token string">"public_ip"</span> <span class="token punctuation">{</span>
<span class="token property">count</span> <span class="token punctuation">=</span> var.allocate_public_ip ? <span class="token number">1</span> : <span class="token number">0</span>
<span class="token property">name</span> <span class="token punctuation">=</span> <span class="token string">"public_ip_for_<span class="token interpolation"><span class="token punctuation">$</span><span class="token punctuation">{</span>ucloud_instance<span class="token punctuation">.</span>web<span class="token punctuation">.</span>name<span class="token punctuation">}</span></span>"</span>
<span class="token property">internet_type</span> <span class="token punctuation">=</span> <span class="token string">"bgp"</span>
<span class="token punctuation">}</span>
<span class="token keyword">resource <span class="token type variable">"ucloud_eip_association"</span></span> <span class="token string">"public_ip_binding"</span> <span class="token punctuation">{</span>
<span class="token property">count</span> <span class="token punctuation">=</span> var.allocate_public_ip ? <span class="token number">1</span> : <span class="token number">0</span>
<span class="token property">eip_id</span> <span class="token punctuation">=</span> ucloud_eip.public_ip<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span>.id
<span class="token property">resource_id</span> <span class="token punctuation">=</span> ucloud_instance.web.id
<span class="token punctuation">}</span>
</code></pre>