mongo - couldn't connect to server 127.0.0.1:27017

I am coming from riak and redis where I never had an issue with this services starting, or to interact.

This is a pervasive problem with mongo and am rather clueless. Restarting does not help.I am new to mongo.

mongo
MongoDB shell version: 2.2.1
connecting to: test
Fri Nov  9 16:44:06 Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js:91
exception: connect failed

This is what I see in the logs.

 now open)
Fri Nov  9 16:44:34 [conn47] end connection 10.29.16.208:5306 (1 connection now open)
Fri Nov  9 16:45:04 [initandlisten] connection accepted from 10.29.16.208:5307 #48 (2 connections now open)
Fri Nov  9 16:45:04 [conn48] end connection 10.29.16.208:5307 (1 connection now open)
Fri Nov  9 16:45:04 [initandlisten] connection accepted from 10.29.16.208:5308 #49 (2 connections now open)
Fri Nov  9 16:45:04 [conn49] end connection 10.29.16.208:5308 (1 connection now open)
Fri Nov  9 16:45:34 [initandlisten] connection accepted from 10.29.16.208:5316 #50 (2 connections now open)
Fri Nov  9 16:45:34 [conn50] end connection 10.29.16.208:5316 (1 connection now open)
Fri Nov  9 16:45:34 [initandlisten] connection accepted from 10.29.16.208:5317 #51 (2 connections now open)
Fri Nov  9 16:45:34 [conn51] end connection 10.29.16.208:5317 (1 connection now open)
Fri Nov  9 16:46:04 [initandlisten] connection accepted from 10.29.16.208:5320 #52 (2 connections now open)
Fri Nov  9 16:46:04 [conn52] end connection 10.29.16.208:5320 (1 connection now open)
Fri Nov  9 16:46:04 [initandlisten] connection accepted from 10.29.16.208:5321 #53 (2 connections now open)
Fri Nov  9 16:46:04 [conn53] end connection 10.29.16.208:5321 (1 conn

Normally this caused because you didn't start mongod process before you try starting mongo shell.

Start mongod server

mongod

Open another terminal window

Start mongo shell

mongo

Resolved.

This problem could be solved by the below mentioned 4 steps

1) Remove .lock file

sudo rm /var/lib/mongodb/mongod.lock 

2) repair the mongodb

mongod -–repair

3) start the mongod server

sudo service mongod start 

4) start the mongo client

mongo

For more details take a look at http://shakthydoss.com/error-couldnt-connect-to-server-127-0-0-127017-srcmongoshellmongo-js-exception-connect-failed/

http://shakthydoss.com/technical/error-couldnt-connect-to-server-127-0-0-127017-srcmongoshellmongo-js-exception-connect-failed/