Warning: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/akb48/public/request_hour/2016/setting/db.php on line 30

Fatal error: Uncaught exception 'Exception' with message 'DbManager#doConnect() error=SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known' in /var/www/akb48/public/request_hour/2016/setting/db.php:33 Stack trace: #0 /var/www/akb48/public/request_hour/2016/setting/db.php(68): DbManager->doConnect('mysql:host=akb4...', 'akbdbadmin', 'pN6AtDPdjLDW') #1 /var/www/akb48/public/request_hour/2016/model/common.php(33): DB_QUERY('\n\t\tSELECT *\n\t\tF...', Array, 1) #2 /var/www/akb48/public/request_hour/2016/controller/index.php(2): getNews() #3 /var/www/akb48/public/request_hour/2016/setting/config.php(67): include('/var/www/akb48/...') #4 /var/www/akb48/public/request_hour/2016/parts/header.php(1): include('/var/www/akb48/...') #5 /var/www/akb48/public/request_hour/2016/index.php(1): include('/var/www/akb48/...') #6 {main} thrown in /var/www/akb48/public/request_hour/2016/setting/db.php on line 33