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<h1 class="title"><a id="configuration"></a>Configuring Logstash<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/logstash/edit/7.1/docs/static/configuration.asciidoc">edit</a></h1>
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<p>To configure Logstash, you create a config file that specifies which plugins you want to use and settings for each plugin.
You can reference event fields in a configuration and use conditionals to process events when they meet certain
criteria. When you run logstash, you use the <code class="literal">-f</code> to specify your config file.</p>
<p>Let’s step through creating a simple config file and using it to run Logstash. Create a file named "logstash-simple.conf" and save it in the same directory as Logstash.</p>
<div class="pre_wrapper lang-ruby">
<pre class="programlisting prettyprint lang-ruby">input { stdin { } }
output {
elasticsearch { hosts => ["localhost:9200"] }
stdout { codec => rubydebug }
}</pre>
</div>
<p>Then, run logstash and specify the configuration file with the <code class="literal">-f</code> flag.</p>
<div class="pre_wrapper lang-ruby">
<pre class="programlisting prettyprint lang-ruby">bin/logstash -f logstash-simple.conf</pre>
</div>
<p>Et voilà! Logstash reads the specified configuration file and outputs to both Elasticsearch and stdout. Note that if you see a message in stdout that reads "Elasticsearch Unreachable" that you will need to make sure Elasticsearch is installed and up and reachable on port 9200. Before we
move on to some <a class="xref" href="config-examples.html" title="Logstash Configuration Examples">more complex examples</a>, let’s take a closer look at what’s in a config file.</p>
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