連接MongoDB時出現錯誤：SHARDING [initandlisten] Marking collection local.system.replset as collection version:

問題詳述：當輸入mongo連接時自動退出，顯示Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed

於是輸入mongod，出現如上問題SHARDING [initandlisten] Marking collection local.system.replset as collection version: <unsharded>

解決辦法：再另外打開一個終端shell，打開對應bin目錄，然后mongo就能連接了

原理：在運行了mongod命令之后，系統輸出的日志會停在I SHARDING [ftdc] Marking collection local.oplog.rs as collection version: <unsharded>，