Mongodb can't connect to localhost but can connect to localhost's IP address

Question

If I try to run mongodb shell with the mongo command alone, I get:

Error: couldn't connect to server 127.0.0.1 shell/mongo.js:84

exception: connect failed

However, if I stipulate localhost's LAN IP address like this:

mongo 10.10.5.90

...it connects fine.

Any clues??

Answer 1

Do you have a bind_ip set in your mongodb.conf (or startup script)? edit for clarity A bind_ip setting limits the IP it will listen on to that IP only.

See the IP Address Binding section: http://www.mongodb.org/display/DOCS/Security+and+Authentication

If not, do you have any firewall rules blocking the localhost access? That would be kind of strange, but I can't think of another reason why it wouldn't work while the LAN IP would work.

Answer 2

This error could also appear if mongodb was not properly shutdown. If you type sudo start mongodb and if it gives a new process id on every execution then your mongodb was not properly shutdown. To resolve this type

sudo rm /var/lib/mongodb/mongod.lock
sudo -u mongodb mongod -f /etc/mongodb.conf --repair 
sudo start mongodb

Answer 3

Just follow all these steps to solve this problem

Step 1: Remove lock file.
sudo rm /var/lib/mongodb/mongod.lock

Step 2: Repair mongodb.
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