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<div><h1 class="title"><a id="id-1"></a>Use environment variables in the configuration</h1><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/copied-from-beats/shared-env-vars.asciidoc">edit</a></div>
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<div class="titlepage"><div><div>
<div class="position-relative"><h2 class="title"><a id="using-environ-vars"></a>Use environment variables in the configuration</h2><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/copied-from-beats/shared-env-vars.asciidoc">edit</a></div>
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<p>You can use environment variable references in the config file to
set values that need to be configurable during deployment. To do this, use:</p>
<p><code class="literal">${VAR}</code></p>
<p>Where <code class="literal">VAR</code> is the name of the environment variable.</p>
<p>Each variable reference is replaced at startup by the value of the environment
variable. The replacement is case-sensitive and occurs before the YAML file is
parsed. References to undefined variables are replaced by empty strings unless
you specify a default value or custom error text.</p>
<p>To specify a default value, use:</p>
<p><code class="literal">${VAR:default_value}</code></p>
<p>Where <code class="literal">default_value</code> is the value to use if the environment variable is
undefined.</p>
<p>To specify custom error text, use:</p>
<p><code class="literal">${VAR:?error_text}</code></p>
<p>Where <code class="literal">error_text</code> is custom text that will be prepended to the error
message if the environment variable cannot be expanded.</p>
<p>If you need to use a literal <code class="literal">${</code> in your configuration file then you can write
<code class="literal">$${</code> to escape the expansion.</p>
<p>After changing the value of an environment variable, you need to restart
APM Server to pick up the new value.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>You can also specify environment variables when you override a config
setting from the command line by using the <code class="literal">-E</code> option. For example:</p>
<p><code class="literal">-E name=${NAME}</code></p>
</div>
</div>
<div class="position-relative"><h3><a id="_examples"></a>Examples</h3><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/copied-from-beats/shared-env-vars.asciidoc">edit</a></div>
<p>Here are some examples of configurations that use environment variables
and what each configuration looks like after replacement:</p>
<div class="informaltable">
<table border="1" cellpadding="4px">
<colgroup>
<col class="col_1"/>
<col class="col_2"/>
<col class="col_3"/>
</colgroup>
<thead>
<tr>
<th align="left" valign="top">Config source</th>
<th align="left" valign="top">Environment setting</th>
<th align="left" valign="top">Config after replacement</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME}</code></p></td>
<td align="left" valign="top"><p><code class="literal">export NAME=elastic</code></p></td>
<td align="left" valign="top"><p><code class="literal">name: elastic</code></p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME}</code></p></td>
<td align="left" valign="top"><p>no setting</p></td>
<td align="left" valign="top"><p><code class="literal">name:</code></p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME:beats}</code></p></td>
<td align="left" valign="top"><p>no setting</p></td>
<td align="left" valign="top"><p><code class="literal">name: beats</code></p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME:beats}</code></p></td>
<td align="left" valign="top"><p><code class="literal">export NAME=elastic</code></p></td>
<td align="left" valign="top"><p><code class="literal">name: elastic</code></p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME:?You need to set the NAME environment variable}</code></p></td>
<td align="left" valign="top"><p>no setting</p></td>
<td align="left" valign="top"><p>None. Returns an error message that’s prepended with the custom text.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">name: ${NAME:?You need to set the NAME environment variable}</code></p></td>
<td align="left" valign="top"><p><code class="literal">export NAME=elastic</code></p></td>
<td align="left" valign="top"><p><code class="literal">name: elastic</code></p></td>
</tr>
</tbody>
</table>
</div>
<div class="position-relative"><h3><a id="_specify_complex_objects_in_environment_variables"></a>Specify complex objects in environment variables</h3><a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/apm-server/edit/6.3/docs/copied-from-beats/shared-env-vars.asciidoc">edit</a></div>
<p>You can specify complex objects, such as lists or dictionaries, in environment
variables by using a JSON-like syntax.</p>
<p>As with JSON, dictionaries and lists are constructed using <code class="literal">{}</code> and <code class="literal">[]</code>. But
unlike JSON, the syntax allows for trailing commas and slightly different string
quotation rules. Strings can be unquoted, single-quoted, or double-quoted, as a
convenience for simple settings and to make it easier for you to mix quotation
usage in the shell. Arrays at the top-level do not require brackets (<code class="literal">[]</code>).</p>
<p>For example, the following environment variable is set to a list:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">ES_HOSTS="10.45.3.2:9220,10.45.3.1:9230"</pre>
</div>
<p>You can reference this variable in the config file:</p>
<div class="pre_wrapper lang-yaml">
<div class="console_code_copy" title="Copy to clipboard"></div>
<pre class="programlisting prettyprint lang-yaml">output.elasticsearch:
hosts: '${ES_HOSTS}'</pre>
</div>
<p>When APM Server loads the config file, it resolves the environment variable and
replaces it with the specified list before reading the <code class="literal">hosts</code> setting.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>Do not use double-quotes (<code class="literal">"</code>) to wrap regular expressions, or the backslash (<code class="literal">\</code>) will be interpreted as an escape character.</p>
</div>
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