Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for db failed: Name does not resolve in /srv/diakon.at/src/diakone-db.php on line 4

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Name does not resolve in /srv/diakon.at/src/diakone-db.php:4 Stack trace: #0 /srv/diakon.at/src/diakone-db.php(4): mysqli_connect('db', 'rztt-da', Object(SensitiveParameterValue)) #1 /srv/diakon.at/src/public/include/db-usage.php(12): include('/srv/diakon.at/...') #2 /srv/diakon.at/src/public/Wien/index.php(9): include('/srv/diakon.at/...') #3 {main} thrown in /srv/diakon.at/src/diakone-db.php on line 4