当我尝试在终端中运行Mongod时，出现以下消息：

2015-05-14T17:33:04.554+0700 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
2015-05-14T17:33:04.554+0700 I CONTROL  [initandlisten] dbexit:  rc: 100

并运行mongo命令：

MongoDB shell version: 3.0.3
connecting to: test
2015-05-14T17:34:26.679+0700 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2015-05-14T17:34:26.681+0700 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
    at connect (src/mongo/shell/mongo.js:179:14)
    at (connect):1:6 at src/mongo/shell/mongo.js:179
exception: connect failed

我试图更改/ var / lib / mongodb和/ var / log /
mongodb中的permision，但仍然无法正常工作，我试图再次卸载并安装mongodb，但仍然存在相同的问题。有人可以帮忙吗？谢谢

我正在使用Ubuntu 14.04 LTS 64位