How to Install MongoDB on Ubuntu 18.04

MongoDB is a free and open-source document database. It belongs to a family of databases called NoSQL, which is different from the traditional table-based SQL databases like MySQL and PostgreSQL.

In MongoDB, data is stored in flexible, JSON-like documents where fields can vary from document to document. It does not require a predefined schema, and data structure can be changed over time.

In this tutorial, we will cover the process of installing and configuring the latest version of MongoDB Community Edition on an Ubuntu 18.04 machine from the official MongoDB repositories.

Prerequisites #

Before continuing with this tutorial, make sure you are logged in as a user with sudo privileges .

Installing MongoDB #

At the time of writing this article, the latest version of MongoDB is version 4.0.

Before continuing with the installation process, head over to the Install on Ubuntu section of MongoDB’s documentation, and check if there is a new release available.

The following steps describe how to install MongoDB on your Ubuntu server:

1. Add the MongoDB GPG key to your system using the following command:

   sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4

   Once the key is imported, add the MongoDB repository with:

   sudo add-apt-repository 'deb [arch=amd64] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse'

   If you get an error message saying add-apt-repository command not found, install the software-properties-common package.

   To install an older version of MongoDB, replace 4.0 with your preferred version.

2. Update the packages list and install the mongodb-org meta-package by typing:

   sudo apt updatesudo apt install mongodb-org

   The following packages will be installed on your system as a part of the mongodb-org package:

   • mongodb-org-server - The mongod daemon and corresponding init scripts and configurations.
   • mongodb-org-mongos - The mongos daemon.
   • mongodb-org-shell - The mongo shell is an interactive JavaScript interface to MongoDB. It is used to perform administrative tasks through the command line.
   • mongodb-org-tools - Contains several MongoDB tools for importing and exporting data, statistics, as well as other utilities.

3. Once the installation is completed, start the MongoDB daemon and enable it to start on boot by typing:

   sudo systemctl start mongodsudo systemctl enable mongod

4. To verify whether the installation has completed successfully, we will connect to the MongoDB database server using the mongo tool and print the connection status:

   mongo --eval 'db.runCommand({ connectionStatus: 1 })'

   The output will look like this:

   MongoDB shell version v4.0.10
   connecting to: mongodb://127.0.0.1:27017
   MongoDB server version: 4.0.10
   {
     "authInfo" : {
       "authenticatedUsers" : [ ],
       "authenticatedUserRoles" : [ ]
     },
     "ok" : 1
   }

   A value of 1 for the ok field indicates success.

Configuring MongoDB #

MongoDB uses a YAML formatted configuration file, /etc/mongod.conf . You can configure your MongoDB instance by editing this file.

The default configuration settings are sufficient for most users. However, for production environments, it is recommended to uncomment the security section and enable authorization, as shown below:

security:
  authorization: enabled

The authorization option enables Role-Based Access Control (RBAC) that regulates users access to database resources and operations. If this option is disabled each user will have access to all databases and perform any action.

After making changes to the MongoDB configuration file, restart the mongod service with:

sudo systemctl restart mongod

To find more information about the configuration options available in MongoDB 4.0, visit the Configuration File Options documentation page.

Creating Administrative MongoDB User #

If you enabled the MongoDB authentication, create an administrative MongoDB user that will be used to access and manage the MongoDB instance.

First, access the mongo shell with:

mongo

Once you are inside the MongoDB shell type the following command to connect to the admin database:

use admin

switched to db admin

Issue the following command to create a new user named mongoAdmin with the userAdminAnyDatabase role:

db.createUser(
  {
    user: "mongoAdmin", 
    pwd: "changeMe", 
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

Successfully added user: {
	"user" : "mongoAdmin",
	"roles" : [
		{
			"role" : "userAdminAnyDatabase",
			"db" : "admin"
		}
	]
}

Exit the mongo shell with:

quit()

To test the changes, access the mongo shell using the administrative user you have previously created:

mongo -u mongoAdmin -p --authenticationDatabase admin

use admin

switched to db admin

Now, print the users with:

show users

{
	"_id" : "admin.mongoAdmin",
	"user" : "mongoAdmin",
	"db" : "admin",
	"roles" : [
		{
			"role" : "userAdminAnyDatabase",
			"db" : "admin"
		}
	],
	"mechanisms" : [
		"SCRAM-SHA-1",
		"SCRAM-SHA-256"
	]
}

You can also try to access the mongo shell without any arguments ( just type mongo) and see if you can list the users using the same commands as above.

Conclusion #

You have learned how to install and configure MongoDB 4.0 on your Ubuntu 18.04 server. Visit the MongoDB 4.0 Manual for more information on this topic.

If you hit a problem or have feedback, leave a comment below.