parameters:
   database_host: localhost
   database_port: null
   database_name: symfony
   database_user: root
   database_password: null
   mailer_transport: smtp
   mailer_host: 127.0.0.1
   mailer_user: null
   mailer_password: null
   secret: (not relevant)

namespace AppBundleGenus;

use DoctrineORMMapping as ORM;

/**
 * @ORMEntity
 * @ORMTable(name="genus")
 */
class Genus
{
    /**
     * @ORMId
     * @ORMGeneratedValue(strategy="AUTO")
     * @ORMColumn(type="integer")
     */
    private $id;
    /**
     * @ORMColumn(type="string")
     */
    private $name;

}

dpkg -l php*mysql
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version       Architecture  Description
+++-=================-=============-=============-============================
un  php-pdo-mysql     <none>        <none>        (no description available)
ii  php7.0-mysql      7.0.8-0ubuntu amd64         MySQL module for PHP
un  php7.0-pdo-mysql  <none>        <none>        (no description available)

XXX@XXX-pc ~/PhpstormProjects/test_symfony $ php bin/console doctrine:database:create


  [DoctrineDBALExceptionConnectionException]
  An exception occured in driver: SQLSTATE[HY000] [2002] No such file or directory



  [DoctrineDBALDriverPDOException]
  SQLSTATE[HY000] [2002] No such file or directory



  [PDOException]
  SQLSTATE[HY000] [2002] No such file or directory