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| <div class="section" id="setting-configuration-options"> |
| <h1>Setting Configuration Options<a class="headerlink" href="#setting-configuration-options" title="Permalink to this headline">¶</a></h1> |
| <p>The first time you run Airflow, it will create a file called <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code> in |
| your <code class="docutils literal notranslate"><span class="pre">$AIRFLOW_HOME</span></code> directory (<code class="docutils literal notranslate"><span class="pre">~/airflow</span></code> by default). This file contains Airflow’s configuration and you |
| can edit it to change any of the settings. You can also set options with environment variables by using this format: |
| <code class="docutils literal notranslate"><span class="pre">$AIRFLOW__{SECTION}__{KEY}</span></code> (note the double underscores).</p> |
| <p>For example, the |
| metadata database connection string can either be set in <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code> like this:</p> |
| <div class="highlight-ini notranslate"><div class="highlight"><pre><span></span><span class="k">[core]</span> |
| <span class="na">sql_alchemy_conn</span> <span class="o">=</span> <span class="s">my_conn_string</span> |
| </pre></div> |
| </div> |
| <p>or by creating a corresponding environment variable:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nb">export</span> <span class="nv">AIRFLOW__CORE__SQL_ALCHEMY_CONN</span><span class="o">=</span>my_conn_string |
| </pre></div> |
| </div> |
| <p>You can also derive the connection string at run time by appending <code class="docutils literal notranslate"><span class="pre">_cmd</span></code> to |
| the key like this:</p> |
| <div class="highlight-ini notranslate"><div class="highlight"><pre><span></span><span class="k">[core]</span> |
| <span class="na">sql_alchemy_conn_cmd</span> <span class="o">=</span> <span class="s">bash_command_to_run</span> |
| </pre></div> |
| </div> |
| <p>The following config options support this <code class="docutils literal notranslate"><span class="pre">_cmd</span></code> version:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">sql_alchemy_conn</span></code> in <code class="docutils literal notranslate"><span class="pre">[core]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">fernet_key</span></code> in <code class="docutils literal notranslate"><span class="pre">[core]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">broker_url</span></code> in <code class="docutils literal notranslate"><span class="pre">[celery]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">result_backend</span></code> in <code class="docutils literal notranslate"><span class="pre">[celery]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">password</span></code> in <code class="docutils literal notranslate"><span class="pre">[atlas]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">smtp_password</span></code> in <code class="docutils literal notranslate"><span class="pre">[smtp]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">bind_password</span></code> in <code class="docutils literal notranslate"><span class="pre">[ldap]</span></code> section</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">git_password</span></code> in <code class="docutils literal notranslate"><span class="pre">[kubernetes]</span></code> section</p></li> |
| </ul> |
| <p>The idea behind this is to not store passwords on boxes in plain text files.</p> |
| <p>The universal order of precedence for all configuration options is as follows:</p> |
| <ol class="arabic simple"> |
| <li><p>set as an environment variable</p></li> |
| <li><p>set in <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code></p></li> |
| <li><p>command in <code class="docutils literal notranslate"><span class="pre">airflow.cfg</span></code></p></li> |
| <li><p>Airflow’s built in defaults</p></li> |
| </ol> |
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