Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/html/login/painel/conn.php on line 9

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/html/login/painel/conn.php:9 Stack trace: #0 /var/www/html/login/painel/conn.php(9): mysqli_connect('db', 'agenda', Object(SensitiveParameterValue), 'agenda_db') #1 /var/www/html/login/painel/recuperar_senha.php(2): include('/var/www/html/l...') #2 {main} thrown in /var/www/html/login/painel/conn.php on line 9