我刚刚在Ubuntu 15.10上安装了MongoDB 3.2.4版，我想运行mongo shell。所有文档都建议先执行命令cd <mongodb installation dir>
我的问题是在哪里mongodb installation dir？我如何找到它？
显然，这可能是错误的mongod。Could not find /usr/bin/mongod详细信息如下。
root@levilinode:/usr/bin# service mongod status
● mongod.service - LSB: An object/document-oriented database
Loaded: loaded (/etc/init.d/mongod)
Active: active (exited) since Tue 2016-04-12 14:22:45 EDT; 1h 37min ago
Docs: man:systemd-sysv-generator(8)
Apr 12 14:22:45 levilinode systemd[1]: Starting LSB: An object/document-oriented database...
Apr 12 14:22:45 levilinode mongod[16541]: Could not find /usr/bin/mongod
Apr 12 14:22:45 levilinode systemd[1]: Started LSB: An object/document-oriented database.
Apr 12 14:24:02 levilinode systemd[1]: Started LSB: An object/document-oriented database.
Apr 12 14:24:26 levilinode systemd[1]: Started LSB: An object/document-oriented database.
Apr 12 15:56:15 levilinode systemd[1]: Started LSB: An object/document-oriented database.
但是，这些文件似乎在那里：
root@levilinode:/usr/bin# ls -la mong*
-rwxr-xr-x 1 root root 19816422 Mar 7 18:32 mongo
-rwxr-xr-x 1 root root 35865168 Mar 7 18:32 mongod
-rwxr-xr-x 1 root root 14661359 Mar 7 18:32 mongodump
-rwxr-xr-x 1 root root 10523458 Mar 7 18:32 mongoexport
-rwxr-xr-x 1 root root 10395740 Mar 7 18:32 mongofiles
-rwxr-xr-x 1 root root 10636848 Mar 7 18:32 mongoimport
-rwxr-xr-x 1 root root 10125973 Mar 7 18:32 mongooplog
-rwxr-xr-x 1 root root 35551461 Mar 7 18:32 mongoperf
-rwxr-xr-x 1 root root 17331345 Mar 7 18:32 mongorestore
-rwxr-xr-x 1 root root 16086077 Mar 7 18:32 mongos
-rwxr-xr-x 1 root root 10353518 Mar 7 18:32 mongostat
-rwxr-xr-x 1 root root 10213613 Mar 7 18:32 mongotop
我想我根据以下问题解决了连接性问题：
然后，按照命令上方显示的链接中的指示运行：
sudo rm /var/lib/mongodb/mongod.lock
sudo service mongod restart
现在一切似乎都正常。
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