how to set mongod --dbpath

Question

very new to mongodb and databases in general. whenever i run mongo i receive this error message: ​​​

MongoDB shell version: 2.         


        

Answer 1

First you will have a config file in /etc/mongodb.conf, therefore this sounds like a homebrew install which will use some more standardized paths. The whole /data/db/ thing is referenced in a lot of manual install documentation.

So basically from your log the server is not running, it's shutting down, so there is nothing for the shell to connect to. Seems like you have had some unclean shutdowns/restarts which has led to the inconsistency.

Clear the files in the journal /usr/local/var/mongodb/journal/ on your config.

Also:

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

Just in case, even though that part looks clean. And then restart.

Answer 2

Scenario: MongoDB(version v4.0.9).

1. Set custom folder(with name: myCustomDatabases), where to store databases.
2. In custom folder(with name: myCustomDatabases), have to create database (with name: newDb).

Resolve:

1. Create custom folder(with name: myCustomDatabases):

   D:>md myCustomDatabases
   

2. Run 'mongod --dbpath' with path to custom folder(with name: myCustomDatabases):

   mongod --dbpath "D:\myCustomDatabases"
   

3. From another 'cmd' run 'mongo':

   D:>mongo
   

   3.1. Show all databases, stored in custom folder(with name: myCustomDatabases):

   >show dbs
   admin   0.000GB
   config  0.000GB
   local   0.000GB
   

   3.2. Use database with name newDb:

   > use newDb
   switched to db newDb
   

   3.3. Show all databases, stored in custom folder(with name: myCustomDatabases):

   >show dbs
   admin   0.000GB
   config  0.000GB
   local   0.000GB
   

   !!! Noticed, that newDb is NOT in the list !!!

   3.4. Have to create a collection with a document, which will create the database newDb.

   > db.Cats.insert({name: 'Leo'})
   WriteResult({ "nInserted" : 1 })
   

   The insert({name: 'Leo'}) operation creates: the database newDB and the collection Cats, because they do not exist.

   3.5. Now the new created database newDb will be displayed in the list.

   > show dbs
   admin   0.000GB
   config  0.000GB
   local   0.000GB
   newDb   0.000GB
   

   3.6. Now in custom folder D:\myCustomDatabases, have database newDb.

Answer 3

You can set dbPath in the mongodb.conf file:

storage:
    dbPath: "/path/to/your/database/data/db"

It's a YAML-based configuration file format (since Mongodb 2.6 version), so pay attention no tabs only spaces, and space after ": "

usually this file located in the *nix systems here: /etc/mongodb.conf

So then just run

$ mongod -f /etc/mongodb.conf

And mongod process will start...

(on the Windows something like)

> C:\MongoDB\bin\mongod.exe -f C:\MongoDB\mongod.conf

Answer 4

mongod  --port portnumber --dbpath /path_to_your_folder

By default portnumber is 27017 and path is /var/lib/mongodb

You can set your own port number and path where you want to keep all your database.

Answer 5

very simple:

sudo chown mongodb:mongodb /var/lib/mongodb/mongod.lock 

Answer 6

You could also configure mongod to run on start up so that it is automatically running on start up and the dbpath is set upon configuration. To do this try:

mongod --smallfiles --config /etc/mongod.conf

The --smallfiles tag is there in case you get an error with size. It is, of course, optional. Doing this should solve your problem while also automating your mongodb setup.