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MongoDB is a NoSQL, document-oriented database designed for flexibility and horizontal scalability — commonly used for APIs, content management systems, and applications with evolving or unstructured data models.

Prerequisites

• Ubuntu 22.04/24.04 or Debian 11/12 VPS
• Root or sudo access

Step 1 — Install Required Packages

sudo apt update
sudo apt install gnupg curl -y

Step 2 — Import the MongoDB GPG Key

curl -fsSL https://pgp.mongodb.com/server-8.0.asc | \
  sudo gpg --dearmor -o /usr/share/keyrings/mongodb-server.gpg

Step 3 — Add the MongoDB Repository

For Ubuntu:

echo "deb [signed-by=/usr/share/keyrings/mongodb-server.gpg] https://repo.mongodb.org/apt/ubuntu $(lsb_release -cs)/mongodb-org/8.0 multiverse" | \
  sudo tee /etc/apt/sources.list.d/mongodb-org.list

For Debian:

echo "deb [signed-by=/usr/share/keyrings/mongodb-server.gpg] https://repo.mongodb.org/apt/debian $(lsb_release -cs)/mongodb-org/8.0 main" | \
  sudo tee /etc/apt/sources.list.d/mongodb-org.list

Step 4 — Install MongoDB

sudo apt update
sudo apt install mongodb-org -y

Step 5 — Enable and Start MongoDB

sudo systemctl enable mongod
sudo systemctl start mongod
sudo systemctl status mongod

Step 6 — Connect and Verify

mongosh

db.version()

Step 7 — Enable Authentication (Important)

By default, MongoDB has no authentication enabled — enable it before any production use.

Create an admin user:

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

Enable authorization:

sudo nano /etc/mongod.conf

security:
  authorization: enabled

sudo systemctl restart mongod

Connect using credentials going forward:

mongosh -u admin -p --authenticationDatabase admin

Restricting Network Access

By default, MongoDB binds only to 127.0.0.1 — keep it that way unless remote access is genuinely required, and restrict any exception to specific trusted IPs at the firewall level.

Common Errors

MongoDB won't start:

sudo journalctl -u mongod

"Authentication failed" — confirm you're connecting with --authenticationDatabase admin and the correct credentials.

Best Practices

• Always enable authentication before production use
• Never expose MongoDB directly to the public internet without authentication and firewall restrictions
• Create separate users with minimal required roles per application
• Schedule regular backups with mongodump

FAQ

Is MongoDB a SQL database?
No — it's a NoSQL, document-oriented database storing data as flexible JSON-like documents rather than fixed relational tables.

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