How to Install MongoDB on Ubuntu + Database and User Setup

MongoDB is a popular NoSQL database system used for storing and managing unstructured data. Here are the steps to install MongoDB on Ubuntu and set up a database and user:

1. Import the MongoDB public key:

```
wget -qO - https://www.mongodb.org/static/pgp/server-5.0.asc | sudo apt-key add -
```

2. Create a MongoDB list file:

```
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/5.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-5.0.list
```

Replace "focal" with your Ubuntu version (e.g. "bionic" or "xenial").

3. Update the package index:

```
sudo apt update
```

4. Install MongoDB:

```
sudo apt install -y mongodb-org
```

5. Start the MongoDB service and enable it to start automatically on boot:

```
sudo systemctl start mongod
sudo systemctl enable mongod
```

6. Verify that MongoDB is running:

```
sudo systemctl status mongod
```

7. Create a MongoDB user and database:

```
mongo
```

This will open the MongoDB shell.

```
use admin
db.createUser({
user: "admin",
pwd: "password",
roles: [{ role: "root", db: "admin" }]
})
```

Replace "password" with a strong password of your choice.

```
use mydatabase
db.createUser({
user: "myuser",
pwd: "password",
roles: [{ role: "readWrite", db: "mydatabase" }]
})
```

Replace "mydatabase" and "myuser" with the names of your database and user, and "password" with a strong password of your choice.

8. Exit the MongoDB shell:

```
exit
```

9. Configure MongoDB to use authentication:

```
sudo nano /etc/mongod.conf
```

Uncomment the following line:

```
security:
authorization: enabled
```

Save the file and exit the text editor.

10. Restart the MongoDB service:

```
sudo systemctl restart mongod
```

You have successfully installed MongoDB on Ubuntu and set up a user and database with authentication. You can now connect to the database from your application using the MongoDB connection string:

```
mongodb://myuser:password@localhost:27017/mydatabase
```

Replace "myuser", "password", and "mydatabase" with the names of your user and database, and the password you chose.