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MongoDB

Install MongoDB on Ubuntu

https://www.mongodb.com/docs/manual/tutorial/install-mongodb-on-ubuntu/

# ubuntu 20.04
wget -qO - https://www.mongodb.org/static/pgp/server-6.0.asc | sudo apt-key add -
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/6.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-6.0.list
sudo apt-get update
sudo apt-get install -y mongodb-org

# optional
echo "mongodb-org hold" | sudo dpkg --set-selections
echo "mongodb-org-database hold" | sudo dpkg --set-selections
echo "mongodb-org-server hold" | sudo dpkg --set-selections
echo "mongodb-mongosh hold" | sudo dpkg --set-selections
echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
echo "mongodb-org-tools hold" | sudo dpkg --set-selections

sudo systemctl start mongod
sudo systemctl status mongod
sudo systemctl enable mongod  # auto restart after rebooting

By default, MongoDB is listening to the localhost address. You can change the bind IP address to 0.0.0.0 for listening to any interface (so that the clients in the Docker containers can also access the server with 172.17.0.1).

  • You can do so by changing /etc/mongod.conf and then restart the MongoDB service sudo service mongodb restart or sudo systemctl restart mongod.

Enable Authentication

Create the User Administrator

> use admin
> db.createUser(
  {
    user: "yourusername",
    pwd: "yourpassword",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

Update the Configuration File

Open /etc/mongod.conf with your favorite code editor and search for the following lines:

security:
  authorization: "disabled"

Change "disabled" to "enabled", save the file, and restart mongod:

sudo service mongodb restart

Connect and Authenticate as the User Administrator

$ mongo mongodb://<host>:<port>
> use admin
> db.auth("yourusername", "yourpassword")
1

You can also connect and authenticate in one single step with mongo mongodb://superadmin:thepianohasbeendrinking@<host>:<port>, but this option isn’t advised because it will leave your credentials visible in your terminal history, which any program on your computer can actually read.

Create Additional Users as Needed

The following operation adds a user myTester to the test database who has readWrite role:

> use test
> db.createUser(
  {
    user: "myTester",
    pwd: "xyz123",
    roles: [ { role: "readWrite", db: "test" } ]
  }
)

Usage

Get Collection Info

use example
db.getCollectionInfos( { name: "employees" } )

Connect to a Specific Database

var url = "mongodb://username:password@localhost:27017/db-name";