Fatal error: Uncaught PDOException: PDO::__construct(): php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/backend/app/db.php:23 Stack trace: #0 /var/www/backend/app/db.php(23): PDO->__construct('mysql:host=mysq...', 'app_user', Object(SensitiveParameterValue), Array) #1 /var/www/backend/public/index.php(43): getPDO() #2 {main} Next PDOException: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/backend/app/db.php:23 Stack trace: #0 /var/www/backend/app/db.php(23): PDO->__construct('mysql:host=mysq...', 'app_user', Object(SensitiveParameterValue), Array) #1 /var/www/backend/public/index.php(43): getPDO() #2 {main} thrown in /var/www/backend/app/db.php on line 23