  mongo
MongoDB shell version: 3.0.1
connecting to: test
2015-04-07T18:46:14.958+0430 W NETWORK  Failed to connect to 127.0.0.1:27017,reason: errno:111 Connection refused
2015-04-07T18:46:14.959+0430 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

我正在安装2.6.4并更新到3.0.1但错误无法解决.
我找到this Answer in stackoverflow并搜索在ubuntu中找到mongod.lock并将其删除然后流程这一步：

Step 2: Repair mongodb. 
sudo mongod --repair 

Step 3: start mongodb.
sudo start mongodb 
or
sudo service mongodb start

Step 4: Check status of mongodb.
sudo status mongodb 
or   
sudo service mongodb status

Step 5: Start mongo console.
mongo

为reapir：

  mongod --repair
2015-04-07T18:58:15.595+0430 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found.,terminating
2015-04-07T18:58:15.595+0430 I CONTROL  [initandlisten] dbexit:  rc: 100

sudo服务mongodb启动时出现此错误：

  sudo service mongodb start
[sudo] password for amir: 
Failed to start mongodb.service: Unit mongodb.service Failed to load: No such file or directory.

和状态：

  sudo service mongodb status
● mongodb.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

并且对于启动shell,第一个问题就是抛出.

我尝试使用linuxbrew安装mongodb并再次错误没有消失…

—————更新——–
因为在什么说“demostene”：

I think you just need to create this folder /data/db . Try sudo mkdir /data/db then repair

我在home / amir / data / db中有/ data / db然后我在root中创建/ data / db而没有任何变化……
在上次我用linuxbrew安装mongo并为此sudo命令在sudo mongod –repair和其他步骤中没有工作,没有sudo那个命令不起作用…
所以我首先在终端尝试sudo su并尝试root中的步骤
在第一步说mongodb不是安装和安装它插入：apt-get install mongo-server
我插入此命令并再次安装mongodb.
现在在root mongo shell中正确启动此版本：

root@AbrFa:/home/amir# mongo
MongoDB shell version: 2.6.3
connecting to: test
>

没有sudo su mongo shell在这个版本中启动：

MongoDB shell version: 3.0.1
connecting to: test

顺便说一下,我想知道这两个版本是否相互冲突？