Setting up a new admin user on MongoDB is easy just follow the following steps.

MongoDB, by default, listens on **port 27017**. To secure your MongoDB instance, you typically add user accounts to restrict access to the database.

Here’s how to add an administrative user account and configure MongoDB to use authentication.

### **Step 1: Access the MongoDB Shell**
First, access the MongoDB shell (`mongosh`) to interact with the MongoDB server.

1mongosh

If you're running MongoDB locally, this will connect to the MongoDB instance on `localhost:27017`.

### **Step 2: Switch to the Admin Database**
MongoDB uses a special `admin` database to store user credentials for administrators. Switch to the `admin` database:

1use admin

### **Step 3: Create an Admin User**

To create a new administrative user, run the following command. This user will have `root` privileges and will be able to manage databases and users.

1db.createUser({
2  user: "admin_user",
3  pwd: "your_secure_password",
4  roles: [{ role: "root", db: "admin" }]
5})

- **`user`**: The username for the new admin account (e.g., `"admin_user"`).

- **`pwd`**: The password for the user (e.g., `"your_secure_password"`).

- **`roles`**: Assigns the `"root"` role to the user. The `"root"` role provides full access to all databases.

### **Step 4: Enable Authentication in MongoDB Configuration**

By default, MongoDB allows connections without authentication. You need to enable authentication in MongoDB's configuration file.

#### **Edit MongoDB Configuration**

1. **Open the MongoDB configuration file** (`mongod.conf`), usually located in `/etc/mongod.conf`:

1sudo nano /etc/mongod.conf

2. **Enable Authentication**:

Look for the `security` section in the config file. If it's not present, add it:

1   security:
2     authorization: "enabled"

**Save and Exit**: Press `Ctrl + X`, then `Y`, and hit `Enter` to save the changes.

### **Step 5: Restart MongoDB**

After enabling authentication, you need to restart the MongoDB service for the changes to take effect.

1sudo systemctl restart mongod

### **Step 6: Connect with Authentication**

Now that authentication is enabled, you will need to provide a username and password when connecting to MongoDB.

To connect to MongoDB as the newly created admin user:

1mongosh "mongodb://admin_user:your_secure_password@localhost:27017/admin"

- **admin_user**: The username you created.

- **your_secure_password**: The password you set.

- **localhost**: The hostname of your MongoDB server (or the IP address if you're connecting remotely).

- **27017**: The default MongoDB port.

#### **For Remote Connections:**

If you are connecting from a remote machine, use the server's IP address:

### **Step 7: Verify the User Creation**

Once connected to MongoDB with the new admin user, you can verify the user creation by running:

1db.getUsers()

This will list all users for the current database.

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