Warning: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/html/vendor/yiisoft/yii2/db/Connection.php on line 600

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known' in /var/www/html/vendor/yiisoft/yii2/db/Connection.php:600 Stack trace: #0 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(600): PDO->__construct('mysql:host=db;d...', 'root', 'BapakAing@2026', NULL) #1 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(542): yii\db\Connection->createPdoInstance() #2 /var/www/html/backend/controllers/LanguageController.php(31): yii\db\Connection->open() #3 /var/www/html/opac/config/main.php(14): require('/var/www/html/b...') #4 /var/www/html/opac/index.php(16): require('/var/www/html/o...') #5 {main} Next exception 'yii\db\Exception' with message 'SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known' in /var/www/html/vendor/yiisoft/yii2/db/Connection.php:547 Stack trace: #0 /var/www/html/backend/controllers/LanguageController.php(31): yii\db\Connection->open() #1 /var/www/html/opac/confi in /var/www/html/vendor/yiisoft/yii2/db/Connection.php on line 547