Mongo is unable to start

Question

I'm trying to start mongo uin windows10 by type: mongo in cmd.

I am getting this error:

C:\Users\Itzik>mongo
MongoDB shell version v3.4.1
connecting to: mongodb://127.0.0.1:27017
2016-12-26T19:00:16.604+0200 W NETWORK  [main] Failed to connect to 127.0.0.1:27017 after 5000ms milliseconds, giving up.
2016-12-26T19:00:16.605+0200 E QUERY    [main] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:234:13
@(connect):1:6
exception: connect failed

C:\Users\Itzik>

I have opened port 27017 in the firewall, and restart mongo's services and it still dont work.

what could it be?

Answer 1

Have you started the server? Mongodb follows a server-client architecture. mongo is the client, but before it is started you need to start mongod, which is the server.

If you haven't, start the server in advance in a different console:

mongod --dbpath "c:\data"

replacing c:\data by any folder where you want to store your data (you need to create the folder in advance).

If mongod is not in the path look in the installation path, it should be something like C:\mongodb\bin\mongod.exe.

When the server says something like 'waiting for connections', then you can go to another console and type mongo to start the client.

Answer 2

In C:\Program Files\MongoDB\ you might not have permission to create file/folder for your user. And mongo installer cannot create it because of lack of Administrative permission for your user.

So in C:\Program Files\MongoDB:

1. Create a folder named data
2. Create a folder named db inside the folder data
3. Now right click on the data folder and choose properties
4. Click security tab and select your user there
5. Click the Full control select box
6. Click ok, ok, ok ...
7. important! if you don't have the path "C:\Program Files\MongoDB\Server\3.4\bin" set in environment variable, please set it.
8. Now go to shell and type : mongod --dbpath "C:\Program Files\MongoDB\data\db"

That's it :)