Fatal error: Uncaught MongoDB\Driver\Exception\ConnectionTimeoutException: No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling hello on 'mongo2:27017'] [Failed to resolve 'mongo3']. Topology type: ReplicaSetWithPrimary in /var/www/html/classes/DatabaseManager.php:8 Stack trace: #0 /var/www/html/classes/DatabaseManager.php(8): MongoDB\Driver\Manager->executeQuery('vmapit.projectM...', Object(MongoDB\Driver\Query)) #1 /var/www/html/index.php(22): DatabaseManager->findProjectMetadataByName('sitemap.xml') #2 {main} thrown in /var/www/html/classes/DatabaseManager.php on line 8