Mongo: couldn't connect to server 127.0.0.1:27

Question

When I try to run mongo in shell in ubuntu or open rockmongo I see this error:

couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:145

What's the reason? I tried to reinstall mongo but this didn't help. When I type sudo apt-get purge mongodb-10gen returned error is

E: Sub-process /usr/bin/dpkg returned an error code (1)

I tried this:

• first remove line about mongo in /etc/apt/sources.list

• run this commands:

  sudo dpkg pr mongofb-10gen sudo apt-get -f install sudo apt-get upadte sudo apt-get upgrade

• then sudo apt-get purge mongodb-10gen is successful

• at the end:

  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10

• add deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen in /etc/apt/sources.list

  sudo apt-get update sudo apt-get install mongodb-10gen

Then when I try to start mongo i saw the same error. :o

Answer 1

even i had the same problem so i deleted the mongod lock file

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

and the restart the server it worked , restarting by command below

sudo service mongodb restart

Answer 2

i got the solution by changing the owner of db directory to 'mongodb'

`sudo chown -R mongodb:mongodb /data/*`

then type 'mongo'

Answer 3

I guess the reason why you cannot connect to mongodb is the insufficient space in the drive on your computer.

Answer 4

If you got this after a restart... Make sure that you have over 3GB+ of space free else Mongo Won't start.

Answer 5

I assume that you followed the steps, outlined here.

Most probably you have a problem with mongo lock (or at least I had it once while installing on ubuntu). I solved it with the following commands:

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

P.S. I by myself recently experienced this problem when I was updating my amazon ec2 instance. I have not properly shut down mongo before doing this and this resulted in a problem with mongo lock.

Answer 6

Check your log file of mongodb. you will get to know the exact issue.

tail -f /var/log/mongodb/mongodb.log

The issue may because of "ERROR: Insufficient free space for journal files"

Increase your volume space that will fix your issue.