如果你在启动MongoDB的时候，出现以下错误：

Wed Apr 27 10:02:41 [initandlisten] shutdown: going to close listening sockets…
Wed Apr 27 10:02:41 [initandlisten] shutdown: going to flush diaglog…
Wed Apr 27 10:02:41 [initandlisten] shutdown: going to close sockets…
Wed Apr 27 10:02:41 [initandlisten] shutdown: waiting for fs preallocator…
Wed Apr 27 10:02:41 [initandlisten] shutdown: closing all files…
Wed Apr 27 10:02:41 closeAllFiles() finished
Wed Apr 27 10:02:41 [initandlisten] shutdown: removing fs lock…
Wed Apr 27 10:02:41 [initandlisten] couldn’t remove fs lock errno:9 Bad file descriptor
Wed Apr 27 10:02:41 dbexit: really exiting now

理论来说，是因为缺乏写权限，无法向/data/db/文件夹写入数据。

修复方法：

sudo chown id -u /data/db

sudo mongo

如果还有问题：

sudo mongo –repaire