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| <div class="section" id="initializing-a-database-backend"> |
| <h1>Initializing a Database Backend<a class="headerlink" href="#initializing-a-database-backend" title="Permalink to this headline">¶</a></h1> |
| <p>If you want to take a real test drive of Airflow, you should consider |
| setting up a real database backend and switching to the LocalExecutor.</p> |
| <p>As Airflow was built to interact with its metadata using the great SqlAlchemy |
| library, you should be able to use any database backend supported as a |
| SqlAlchemy backend. We recommend using <strong>MySQL</strong> or <strong>Postgres</strong>.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>We rely on more strict ANSI SQL settings for MySQL in order to have |
| sane defaults. Make sure to have specified <cite>explicit_defaults_for_timestamp=1</cite> |
| in your my.cnf under <cite>[mysqld]</cite></p> |
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| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>If you decide to use <strong>Postgres</strong>, we recommend using the <code class="docutils literal notranslate"><span class="pre">psycopg2</span></code> |
| driver and specifying it in your SqlAlchemy connection string. |
| Also note that since SqlAlchemy does not expose a way to target a |
| specific schema in the Postgres connection URI, you may |
| want to set a default schema for your role with a |
| command similar to <code class="docutils literal notranslate"><span class="pre">ALTER</span> <span class="pre">ROLE</span> <span class="pre">username</span> <span class="pre">SET</span> <span class="pre">search_path</span> <span class="pre">=</span> <span class="pre">airflow,</span> <span class="pre">foobar;</span></code></p> |
| </div> |
| <p>Once you’ve setup your database to host Airflow, you’ll need to alter the |
| SqlAlchemy connection string located in your configuration file |
| <code class="docutils literal notranslate"><span class="pre">$AIRFLOW_HOME/airflow.cfg</span></code>. You should then also change the “executor” |
| setting to use “LocalExecutor”, an executor that can parallelize task |
| instances locally.</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="c1"># initialize the database</span> |
| airflow initdb |
| </pre></div> |
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