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Syam Sundar K
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<div class="td-content">
<h1>vars</h1>
<div class="lead">Substitute name references.</div>
<p>Vars 用于从一个 resource 字段中获取值，并将该值插入指定位置 - 反射功能。</p>
<p>例如，假设需要在容器的 command 中指定了 Service 对象的名称，并在容器的 env 中指定了 Secret 对象的名称来确保以下内容可以正常工作：</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">containers</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span>- <span style="color:#204a87;font-weight:bold">image</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">myimage</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">command</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000;font-weight:bold">[</span><span style="color:#4e9a06">&#34;start&#34;</span><span style="color:#000;font-weight:bold">,</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#4e9a06">&#34;--host&#34;</span><span style="color:#000;font-weight:bold">,</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#4e9a06">&#34;$(MY_SERVICE_NAME)&#34;</span><span style="color:#000;font-weight:bold">]</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">env</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span>- <span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">SECRET_TOKEN</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">value</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">$(SOME_SECRET_NAME)</span><span style="color:#f8f8f8;text-decoration:underline">
</span></code></pre></div><p>则可以在 <code>vars：</code> 中添加如下内容：</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#204a87;font-weight:bold">apiVersion</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">kustomize.config.k8s.io/v1beta1</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">kind</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">Kustomization</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">vars</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span>- <span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">SOME_SECRET_NAME</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">objref</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">kind</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">Secret</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">my-secret</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">apiVersion</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">v1</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span>- <span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">MY_SERVICE_NAME</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">objref</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">kind</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">Service</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">my-service</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">apiVersion</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">v1</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">fieldref</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">fieldpath</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">metadata.name</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span>- <span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">ANOTHER_DEPLOYMENTS_POD_RESTART_POLICY</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">objref</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">kind</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">Deployment</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">my-deployment</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">apiVersion</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">apps/v1</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">fieldref</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#204a87;font-weight:bold">fieldpath</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span><span style="color:#000">spec.template.spec.restartPolicy</span><span style="color:#f8f8f8;text-decoration:underline">
</span></code></pre></div><p>var 是包含该对象的变量名、对象引用和字段引用的元组。</p>
<p>字段引用是可选的，默认为 <code>metadata.name</code>，这是正常的默认值，因为 kustomize 用于生成或修改 resources 的名称。</p>
<p>在撰写本文档时，仅支持字符串类型字段，不支持 ints，bools，arrays 等。例如，在某些pod模板的容器编号2中提取镜像的名称是不可能的。</p>
<p>变量引用，即字符串 &lsquo;$(FOO)&rsquo; ，只能放在 kustomize 配置指定的特定对象的特定字段中。</p>
<p>关于 vars 的默认配置数据可以查看：
<a href="/api/konfig/builtinpluginconsts/varreference.go">/api/konfig/builtinpluginconsts/varreference.go</a></p>
<p>默认目标是所有容器 command args 和 env 字段。</p>
<p>Vars <em>不应该</em> 被用于 kustomize 已经处理过的配置中插入 names 。
例如， Deployment 可以通过 name 引用 ConfigMap ，如果 kustomize 更改 ConfigMap 的名称，则知道更改 Deployment 中的引用的 name 。</p>
<meta http-equiv="refresh" content="0; url=https://kubectl.docs.kubernetes.io/zh/api-reference/kustomization/var/" />
<p>Moved to <a href="https://github.com/kubernetes-sigs/cli-experimental">https://github.com/kubernetes-sigs/cli-experimental</a></p>
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<div class="text-muted mt-5 pt-3 border-top">最后修改 2020年06月15日: <a href="https://github.com/kubernetes-sigs/kustomize/commit/518147c129f831913d33226cf17068d0d4270f41">add zh docsy (518147c1)</a>
<div class="text-muted mt-5 pt-3 border-top">最后修改 2020年11月25日: <a href="https://github.com/kubernetes-sigs/kustomize/commit/14eac6020f43cd07a86722f5e937ae8c75873e43">remove duplicate contents and redirect (14eac602)</a>
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