Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for mysql_esp32 failed: Name or service not known in /var/www/html/config.php on line 15

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql_esp32 failed: Name or service not known in /var/www/html/config.php:15 Stack trace: #0 /var/www/html/config.php(15): mysqli->__construct('mysql_esp32', 'ESP32_USER', 'ESP32_PASSWORD', 'ESP32') #1 /var/www/html/inc/header.php(10): require_once('/var/www/html/c...') #2 /var/www/html/index.php(3): require_once('/var/www/html/i...') #3 {main} thrown in /var/www/html/config.php on line 15