How to Install MongoDB on Ubuntu 21.04

Content below is from crowncloud, I am posting it here for my own reference.

MongoDB is an open-source document database. Unlike relational databases that store data in tables and rows, MongoDB stores records as documents.

• Install the dependencies
• Download and add the MongoDB GPG key with the following command
• Creating Administrative MongoDB User

Install the dependencies

apt update
apt install dirmngr gnupg apt-transport-https ca-certificates software-properties-common

Download and add the MongoDB GPG key with the following command

wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -

Output:

root@crowncloud:~# wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
OK

Adding the MongoDB repository with the following command.

add-apt-repository 'deb [arch=amd64] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse'

Output:

root@crowncloud:~# add-apt-repository 'deb [arch=amd64] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse'
Hit:1 http://gb.archive.ubuntu.com/ubuntu focal InRelease
Ign:2 https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 InRelease
Hit:3 http://gb.archive.ubuntu.com/ubuntu focal-updates InRelease
Get:4 https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 Release [5,389 B]
Hit:5 http://gb.archive.ubuntu.com/ubuntu focal-backports InRelease
Get:6 https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 Release.gpg [801 B]
Hit:7 http://gb.archive.ubuntu.com/ubuntu focal-security InRelease
Get:8 https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4/multiverse amd64 Packages [5,163 B]
Fetched 11.4 kB in 2s (7,533 B/s)
Reading package lists... Done

Install the MongoDB with the following command.

apt install mongodb-org

Start the MongoDB service and enable it to start automatically after rebooting the system.

systemctl start mongod
systemctl enable mongod

Output:

root@vps:~# systemctl start mongod
root@vps:~# systemctl enable mongod
Created symlink /etc/systemd/system/multi-user.target.wants/mongod.service → /lib/systemd/system/mongod.service.

Now, check the status of the MongoDB service.

systemctl status mongod

Output:

root@vps:~# systemctl status mongod
● mongod.service - MongoDB Database Server
     Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2021-04-30 02:31:19 UTC; 58s ago
       Docs: https://docs.mongodb.org/manual
   Main PID: 2798 (mongod)
     Memory: 58.7M
     CGroup: /system.slice/mongod.service
             └─2798 /usr/bin/mongod --config /etc/mongod.conf

Apr 30 02:31:19 vps.server.com systemd[1]: Started MongoDB Database Server.

Verify the installation with this command.

mongo --eval 'db.runCommand({ connectionStatus: 1 })'

Output:

root@vps:~# mongo --eval 'db.runCommand({ connectionStatus: 1 })'
MongoDB shell version v4.4.5
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("8d3c4ed4-361b-40ac-8f38-dd0ce3cccf2f") }
MongoDB server version: 4.4.5
{
        "authInfo" : {
                "authenticatedUsers" : [ ],
                "authenticatedUserRoles" : [ ]
        },
        "ok" : 1
}

Creating Administrative MongoDB User

First, access the MongoDB shell.

mongo

Output:

root@vps:~# mongo
MongoDB shell version v4.4.5
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("f784c9cf-7b0a-4178-ba21-ceb1f52ff3d6") }
MongoDB server version: 4.4.5
Welcome to the MongoDB shell.
For interactive help, type "help".
For documentation, see
        https://docs.mongodb.com/
Questions? Try the MongoDB Developer Community Forums
        https://community.mongodb.com
---

Connect to the admin database.

use admin

Output:

> use admin
switched to db admin
>

Run the following command to create a new user and set the password for the user.

db.createUser(
    {
        user: "mongoAdmin",
        pwd: "KAb3747d",
        roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
    }
)

Output:

Successfully added user: {
                "user" : "mongoAdmin",
                "roles" : [
                                {
                                        "role" : "userAdminAnyDatabase",
                                        "db" : "admin"
                                }
                ]
}
>

Exit the mongo shell.

quit()

To test the changes, access the mongo shell using the created administrative user.

mongo -u mongoAdmin -p --authenticationDatabase admin

Output:

    >root@vps:~# mongo -u mongoAdmin -p --authenticationDatabase admin
MongoDB shell version v4.4.5
Enter password:

Switch to the admin database.

use admin

Output:

> use admin
switched to db admin

List the users and see if you can list the created user.

show users

Output:

> show users
{
        "_id" : "admin.mongoAdmin",
        "userId" : UUID("00b14d8c-9bbe-4b74-ab74-743571ed5193"),
        "user" : "mongoAdmin",
        "db" : "admin",
        "roles" : [
                {
                        "role" : "userAdminAnyDatabase",
                        "db" : "admin"
                }
        ],
        "mechanisms" : [
                "SCRAM-SHA-1",
                "SCRAM-SHA-256"
        ]
}
>

Thanks for reading! 😁