Effortless MongoDB Installation Guide for CentOS 8: Master the Process with Ease

by TP Singh
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This blog is about installing MongoDB on a CentOS 8 server step-by-step in this tutorial. With its high performance, scalability, and flexibility, MongoDB is a well-liked NoSQL database system and a great option for many applications. This guide will assist you in getting MongoDB up and running on CentOS 8 whether you are setting up a new server or updating an existing one.




Before we proceed with the installation, there are a few prerequisites you should have in place:

  1. CentOS 8 Server: Ensure you have a CentOS 8 server with root access or a user with sudo privileges.
  2. Update System Packages: It’s always a good practice to update the system packages to the latest versions. You can do this by running the following command:
    sudo yum update -y

Step 1: Add Repository

The first step is to add the official MongoDB repository to your CentOS 8 system. This provides the necessary packages to ensure a smooth installation process. Here’s how to add the repository:

Create a repository :

sudo nano /etc/yum.repos.d/mongodb-org-6.0.repo 

Now, paste the following content into the file:

name=MongoDB Repository

Save and close the file.

Step 2: Install :

With the above repository added, it’s time to install MongoDB on your CentOS 8 system:

Install with the following command:

sudo yum install -y mongodb-org

After the installation is complete, start the database service and enable it to start on boot:

sudo systemctl start mongod

sudo systemctl enable mongod

Verify that database is running by checking its status:

sudo systemctl status mongod

Step 3: Secure MongoDB

Securing your database installation is crucial to protect your data and server. By default, MongoDB does not have authentication enabled. Let’s enable authentication to ensure the safety of your database:

Access the MongoDB shell:

In previous version we used mongo as command to access mongo shell but in new version it’s now mongosh.


Switch to the admin database:

use admin

Create an administrative user with a strong password:

user: "mdbadmin",
pwd: "password",
roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]

Exit the  shell:


Update the database configuration file to enable authentication:

sudo nano /etc/mongod.conf

Find the line #security: and remove the ‘#’ symbol at the beginning.


  authorization: "enabled

remember two space before authorization. Save and close the file.

Restart to apply the changes:

sudo systemctl restart mongod

Step 4: Test MongoDB

To ensure that database is functioning correctly and that you can access it with the administrative user, follow these steps:

Access the shell with the admin user:

mongo -u admin -p --authenticationDatabase admin

You should now be logged in and ready to perform administrative tasks within database.

Roles in MongoDB

Before assigning any role to any user you must understand the privileges of role. So that you can control access and secure your database.

Database user roles

Database user roles are normal user roles that are useful in regular database interactions.

readRead all non-system collections and the system.js collection
readWriteBoth Read and Write functionality on non-system collections and the system.js collection

Database administration roles

These are roles that are used to carry out administrative operations on databases.

dbAdminPerform administrative tasks such as indexing and gathering statistics, but cannot manage users or roles
userAdminProvides the ability to create and modify roles and users of a specific database
dbOwnerThis is the owner of the database who can perform any action. It is equal to combining all the roles mentioned above: readWrite, dbAdmin, and userAdmin roles

All database roles

These are database roles that provide privileges to interact with all databases, excluding local and config databases.

readAnyDatabaseRead any database
readWriteAnyDatabaseProvides read and write privileges to all databases
userAdminAnyDatabaseCreate and Modify users and roles across all databases
dbAdminAnyDatabasePerform database administrative functions on all databases

Cluster admin roles

These roles enable users to interact and administrate MongoDB clusters.

clusterManagerEnables management and monitoring functionality on the cluster. Provides access to config and local databases used in sharding and replication
clusterMonitorProvide read-only access to MongoDB monitoring tools such as Cloud Manager or Ops Manager monitoring agent
hostManagerProvides the ability to monitor and manage individual servers
clusterAdminThis role includes the highest number of cluster administrative privileges allowing a user to do virtually anything. This functionality is equal to the combination of clusterManager, clusterMonitor, hostManager roles, and dropDatabase action

Create Normal User

Create a user for a specific database this user can access only database assigned to him. For example we want to create a database sales and for that we need a specific user who can access this database and modify and delete documents from database. Authentication in database is very important it will help you and protect from different kind cyber attacks if you want to learn about RCE you can check out.

user: "salesadmin",
pwd: "password",
roles:[{role: "userAdmin" , db:"Sales"}]}

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