Error

SQLSTATE[HY000] [2002] No route to host

#0 /var/www/html/library_common/core/Database.php(20): PDO->__construct('mysql:host=host...', 'dox3_shop', Object(SensitiveParameterValue), Array)
#1 /var/www/html/library_common/core/Model.php(13): Database::getInstance()
#2 /var/www/html/_shop/apps/home_controller.php(16): Model->__construct()
#3 /var/www/html/library_common/core/Router.php(79): HomeController->__construct()
#4 /var/www/html/library_common/core/Router.php(31): Router->executeRoute(Array)
#5 /var/www/html/_shop/index.php(86): Router->dispatch()
#6 {main}