The article about installing a mongodb server missed defining the authentication of the users who can connect to that server.

In this case, authentication will be enabled for access to the server.

The first step is to disable authentication in the /etc/mongodb.conf file:

# Turn on/off security.  Off is currently the default
#noauth = true
#auth = true

Start the mongodb service:

 systemctl start  mongodb.service

Check whether it came up:

systemctl status  mongodb.service
● mongodb.service - An object/document-oriented database
   Loaded: loaded (/lib/systemd/system/mongodb.service; enabled)
   Active: active (running) since vie 2015-05-08 11:44:26 VET; 5s ago
     Docs: man:mongod(1)
 Main PID: 3405 (mongod)
   CGroup: /system.slice/mongodb.service
           └─3405 /usr/bin/mongod --config /etc/mongodb.conf

may 08 11:44:26 grievous mongod[3405]: all output going to: /var/log/mongodb/mongodb.log

Access the mongodb shell:

mongo
MongoDB shell version: 2.4.10
connecting to: test
>

Switch to the admin database:

> use admin
switched to db admin

Create the admin user with password 123456 (for teaching purposes only) and the read/write and dbAdmin roles.

> db.addUser("admin","123")
{
 "user" : "admin",
 "readOnly" : false,
 "pwd" : "9f3121efccbe3fef09a799d5e63077c2",
 "_id" : ObjectId("554cf1405cf1b965e6f5c10f")
}

Exit the database:

> exit
bye

Now edit the /etc/mongodb.conf file to enable authentication:

# Turn on/off security.  Off is currently the default
#noauth = true
auth = true

Restart mongodb:

systemctl stop  mongodb.service
systemctl stop  mongodb.service
systemctl status   mongodb.service
● mongodb.service - An object/document-oriented database
   Loaded: loaded (/lib/systemd/system/mongodb.service; enabled)
   Active: active (running) since vie 2015-05-08 11:58:44 VET; 4s ago
     Docs: man:mongod(1)
 Main PID: 4188 (mongod)
   CGroup: /system.slice/mongodb.service
           └─4188 /usr/bin/mongod --config /etc/mongodb.conf

may 08 11:58:44 grievous mongod[4188]: all output going to: /var/log/mongodb/mongodb.log

Run the mongodb shell and try to list the databases:

> show dbs
Fri May  8 12:06:19.122 listDatabases failed:{ "ok" : 0, "errmsg" : "unauthorized" } at src/mongo/shell/mongo.js:46

Note that you are not authorized to see the list of databases.

To log in and authenticate the user, do the following:

> use admin
switched to db admin
> db.auth("admin", "123")
1

List databases:

> show dbs
admin 0.203125GB
local 0.078125GB
personasdb 0.203125GB

List users:

> db.system.users.find()
{ "_id" : ObjectId("554ce337c597c2dbd0089d74"), "user" : "admin", "pwd" : "95ec4261124ba5951720b199908d892b", "roles" : [  "readWrite",  "dbAdmin" ] }

For more information, see the following links:

  1. https://dezkareid.wordpress.com/2013/07/29/control-de-usuarios-en-mongodb/
  2. https://carlosazaustre.es/blog/como-conectarte-remotamente-a-tu-base-de-datos-mongodb/ (broken link)
  3. http://docs.mongodb.org/v2.4/tutorial/add-user-to-database/
  4. http://juanvicenteherrera.es/2011/12/20/mongodb-conceptos-de-seguridad/
  5. https://alexanderae.com/mongodb-autenticacion-autorizacion.html

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