Exporting data from MySQL docker container
<p>I use the official MySQL docker image, and I am having difficulty exporting data from the instance without errors. I run my export like this:</p>

<pre><code>docker run -it --link containername:mysql --rm mysql sh -c 
    'exec mysqldump 
        -h"$MYSQL_PORT_3306_TCP_ADDR" 
        -P"$MYSQL_PORT_3306_TCP_PORT" -uroot 
        -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD" 
     dbname'
| gz &gt; output.sql.gz
</code></pre>

<p>However, this results in the warning:</p>

<pre><code>"mysqldump: [Warning] Using a password on the command line interface can be insecure."
</code></pre>

<p>As the first line of the outputted file. Obviously this later causes problems for any other MySQL processes which are used to consume the data.</p>

<p>Is there any way to suppress this warning from the mysqldump client?</p>