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

Answer 1

OK, this may be strange. My error happened because my log grew exponentially and clogged up server space hence mongo didn't get enough space to store anything.

so I cleared the log

> /var/log/mongod.log

Answer 2

try this one:

get into the bin folder on terminal, then write:

sudo ./mongod --dbpath <write_here_the_path_to_your_database>, click enter. (always do same thing).

then sudo ./mongo

Answer 3

Remove mongod.lock file. And run "mongod -repair". uninstall/reinstall mongod service fixed that problem for me.

Thanks.

Answer 4

Another solution that resolved this same error for me, though this one might only be if you are accessing mongo (locally) via a SSH connection via a virtual machine (at least that's my setup), and may be a linux specific environment variable issue:

export LC_ALL=C

Also, I have had more success running mongo as a daemon service then with sudo service start, my understanding is this uses command line arguments rather then the config file so it likely is an issue with my config file:

mongod --fork --logpath /var/log/mongodb.log --auth --port 27017 --dbpath /var/lib/mongodb/admin

Answer 5

if all the solution above doesn't work out perhaps then this might be one to help. Somewhere down the line you may have made connection to your local mongodb database via vagrant boxes.

1. vagrant up and then ssh into your vagrant machine in which you've made connection with mongodb (vagrant ssh vagrant_box_name)
2. comment out the bind_ip line from /etc/mongod.conf using # (sudo nano /etc/mongod.conf )
3. restart your mongodb daemon service (sudo service mongod restart) voila...

Answer 6

in my case in windows and ubuntu, i needed to create /data/db folder in root. In ubuntu, i needed one additional option; to give permissions for directory.

windows

mkdir c:/data/db

ubuntu:

sudo mkdir -p /data/db
sudo chmod 700 /data/db

then run

sudo service mongod start

check

sudo service mongod status

and then run

mongo