mongo - couldn't connect to server 127.0.0.1:27017

Question

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

Answer 1

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

Answer 2

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/

Answer 3

This method only works if you want to repair your data files without preserving the original files

To find where you dbpath resides- vim /etc/mongodb.conf

check for option dbpath=

(I have dbpath=/var/lib/mongodb)

Default: /data/db/

Typical locations include: /srv/mongodb, /var/lib/mongodb or /opt/mongodb .

Replace the /var/lib/mongodb with your dbpath

sudo rm /var/lib/mongodb/mongod.lock
sudo mongod --dbpath /var/lib/mongodb/ --repair
sudo mongod --dbpath /var/lib/mongodb/ --journal

(Make sure that you leave you terminal running in which you have run above lines, dont press 'Ctrl+c' or quit it.) Type the command to start mongo now in another window.

Hope this works for you ! for those who want to repair your data files while preserving the original files mongo recover

Answer 4

This error is what you would see if the mongo shell was not able to talk to the mongod server.

This could be because the address was wrong (host or IP) or that it was not running. One thing to note is the log trace provided does not cover the "Fri Nov 9 16:44:06" of your mongo timestamp.

Can you:

1. Provide the command line arguments (if any) used to start your mongod process
2. Provide the log file activity from the mongod startup as well as logs during the mongo shell startup attempt?
3. Confirm that your mongod process is being started on the same machine as the mongo shell?

Answer 5

I am a windows user and I installed MongoDB in November 2018 and I didn't wanted to setup data/db directories. But after few days, when I open, got an error message:

MongoDB shell version v4.0.4
connecting to: mongodb://127.0.0.1:27017
2018-12-05T20:42:40.108+0530 E QUERY    [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: No connection could be made because the target machine actively refused it. :
connect@src/mongo/shell/mongo.js:257:13
@(connect):1:6
exception: connect failed

Then I tried to fix using all of above answers and didn't worked. When I tried to run mongod it said

MongoDB starting : pid=12220 port=27017 dbpath=C:\data\db\ 64-bit host=bla

I tried to change the db path(to program files) through file system and also using cmd but those didnot worked.

Solution that worked for me is:

Opened the Task Manager (ctrl + shift + esc) -> Services tab and there was a MongoDB row with the status stopped. Then I right clicked and clicked start and everything working perfectly :).

Answer 6

MAC OS

Check status

brew services list

Something like:

Name    Status  User Plist
mongodb stopped  

start it

brew services start mongodb

Try it again

mongo or mongo --port 27017

Answer 7

Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: No connection could be made because the target machine actively refused it.

This error caused because Mongo Server been closed

Simple Follow these steps

1. Open Task Manager
2. Go to >Services
3. Find MongoDB
4. Right click and select Start

Answer 8

In my case:

First I open config file

sudo vi /etc/mongodb.conf

Comment IP and Port like this

#bind_ip = 127.0.0.1
#port = 27017

Then restart mongodb

sudo service mongodb restart
sudo service mongod restart

Finally, it's work :D

finn@Finn ~ $ mongo
MongoDB shell version: 2.4.9
connecting to: test
> exit