How to install MongoDB on Ubuntu 18.04?

Install MongoDB Community Edition on Unbuntu 18.04 (Bionic)

Import the MongoDB public GPG Key from https://www.mongodb.org/static/pgp/server-4.2.asc

wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | sudo apt-key add -

Create the list file /etc/apt/sources.list.d/mongodb-org-4.2.list for your ubuntu version

echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.2.list

Reload local package database

sudo apt-get update

Install MongoDB packages

sudo apt-get install -y mongodb-org

Optional. Although you can specify any available version of MongoDB, apt-get will upgrade the packages when a newer version becomes available. To prevent unintended upgrades, you can pin the package at the currently installed version:

echo "mongodb-org hold" | sudo dpkg --set-selections
echo "mongodb-org-server hold" | sudo dpkg --set-selections
echo "mongodb-org-shell hold" | sudo dpkg --set-selections
echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
echo "mongodb-org-tools hold" | sudo dpkg --set-selections

Directories are at

/var/lib/mongodb
/var/log/mongodb

Configuration files are at

/etc/mongod.conf

Start MongoDB

sudo service mongod start

To verify MongoDB is started successfully, check the following content on /var/log/mongodb/mongod.log

[initandlisten] waiting for connections on port 27017

Process

sudo service mongod stop
sudo service mongod restart

Use MongoDB using command shell

mongo

Uninstall MongoDB steps

sudo service mongod stop
sudo apt-get purge mongodb-org* # remove mongoDB packages
# remove data directories
sudo rm -r /var/log/mongodb 
sudo rm -r /var/lib/mongodb