title: Install MySQL Database driver for Superset inside a docker
body: <p>I have installed <a href="https://superset.incubator.apache.org/installation.html" rel="nofollow noreferrer">Superset</a> using the docker method, but now I can't connect to my MySQL database because the driver can't be loaded.</p>
  
  <p>I have tried installing it via <code>pip install mysqlclient</code>, and it is reported as successfully installed :</p>
  
  <pre><code>Collecting mysqlclient
    Using cached mysqlclient-1.4.6.tar.gz (85 kB)
  Building wheels for collected packages: mysqlclient
    Building wheel for mysqlclient (setup.py) ... done
    Created wheel for mysqlclient: filename=mysqlclient-1.4.6-cp38-cp38-linux_x86_64.whl size=108116 sha256=b05681e22caca22b405d0b518651bb8849df47e31f124571dd8788d585dd522f
    Stored in directory: /root/.cache/pip/wheels/8a/3c/e6/347e293dbcd62352ee2806f68d624aae821bca7efe0070c963
  Successfully built mysqlclient
  Installing collected packages: mysqlclient
  Successfully installed mysqlclient-1.4.6
  </code></pre>
  
  <p>I have restarted the docker, but the driver <em>still</em> can't be loaded inside Superset.</p>
  
  <p>What needs to be done? How can I install the missing MySQL driver so the docker container can see it and use it?</p>