Fatal error: Uncaught Error: Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' in /usr/share/php/Icinga/Data/Db/DbConnection.php:171 Stack trace: #0 /usr/share/php/Icinga/Data/Db/DbConnection.php(76): Icinga\Data\Db\DbConnection->connect() #1 /usr/share/php/Icinga/Data/ResourceFactory.php(104): Icinga\Data\Db\DbConnection->__construct(Object(Icinga\Data\ConfigObject)) #2 /usr/share/php/Icinga/Data/ResourceFactory.php(140): Icinga\Data\ResourceFactory::createResource(Object(Icinga\Data\ConfigObject)) #3 /usr/share/php/Icinga/Authentication/User/UserBackend.php(210): Icinga\Data\ResourceFactory::create('icingaweb_db') #4 /usr/share/php/Icinga/Authentication/AuthChain.php(241): Icinga\Authentication\User\UserBackend::create('icingaweb2', Object(Icinga\Data\ConfigObject)) #5 /usr/share/php/Icinga/Authentication/Auth.php(259): Icinga\Authentication\AuthChain->valid() #6 /usr/share/php/Icinga/Authentication/Auth.php(92): Icinga\Authentication\Auth->authExternal() #7 /usr/share/php/Icinga/Application/Web.php(422): Icinga\Authen in /usr/share/php/Icinga/Data/Db/DbConnection.php on line 171