Install & Configure MongoDB on the Raspberry Pi

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version: 2
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ethernets:
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   eth0:
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      dhcp4: true
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      optional: true
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wifis:
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   wlan0:
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      dhcp4: true
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      optional: true
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      access-points:
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         "YOUR-WIFI-SSID":
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            password: "YOUR-WIFI-PASSWORD"

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sudo apt update
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sudo apt upgrade

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# Install the MongoDB 4.4 GPG key:
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wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
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# Add the source location for the MongoDB packages:
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echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list
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# Download the package details for the MongoDB packages:
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sudo apt-get update
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# Install MongoDB:
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sudo apt-get install -y mongodb-org

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# Ensure mongod config is picked up:
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sudo systemctl daemon-reload
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# Tell systemd to run mongod on reboot:
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sudo systemctl enable mongod
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# Start up mongod!
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sudo systemctl start mongod

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$ sudo systemctl status mongod
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● mongod.service - MongoDB Database Server
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   Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
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   Active: active (running) since Tue 2020-08-09 08:09:07 UTC; 4s ago
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   Docs: https://docs.mongodb.org/manual
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Main PID: 2366 (mongod)
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   CGroup: /system.slice/mongod.service
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         └─2366 /usr/bin/mongod --config /etc/mongod.conf

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# Connect to the local mongod, on the default port:
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$ mongo
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MongoDB shell version v4.4.0
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connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
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Implicit session: session { "id" : UUID("576ec12b-6c1a-4382-8fae-8b6140e76d51") }
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MongoDB server version: 4.4.0
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---
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The server generated these startup warnings when booting:
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      2020-08-09T08:09:08.697+00:00: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem
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      2020-08-09T08:09:10.712+00:00: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted
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---
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---
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      Enable MongoDB's free cloud-based monitoring service, which will then receive and display
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      metrics about your deployment (disk utilization, CPU, operation statistics, etc).
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      The monitoring data will be available on a MongoDB website with a unique URL accessible to you
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      and anyone you share the URL with. MongoDB may use this information to make product
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      improvements and to suggest MongoDB products and deployment options to you.
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      To enable free monitoring, run the following command: db.enableFreeMonitoring()
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      To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
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---

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use admin
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db.createUser( { user: "admin",
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            pwd: "SUPERSECRETPASSWORD",
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            roles: [ "userAdminAnyDatabase",
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                     "dbAdminAnyDatabase",
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                     "readWriteAnyDatabase"] } )
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exit

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# These two lines must be uncommented and in the file together:
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security:
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   authorization: enabled

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sudo systemctl restart mongod

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$ mongo
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MongoDB shell version v4.4.0
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connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
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Implicit session: session { "id" : UUID("4002052b-1a39-4158-8a99-234cfd818e30") }
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MongoDB server version: 4.4.0
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> db.adminCommand({listDatabases: 1})
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{
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      "ok" : 0,
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      "errmsg" : "command listDatabases requires authentication",
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      "code" : 13,
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      "codeName" : "Unauthorized"
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}
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> exit

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$ mongo -u "admin" -p "SUPERSECRETPASSWORD"
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MongoDB shell version v4.4.0
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connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
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Implicit session: session { "id" : UUID("3dee8ec3-6e7f-4203-a6ad-976b55ea3020") }
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MongoDB server version: 4.4.0
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> db.adminCommand({listDatabases: 1})
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{
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      "databases" : [
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               {
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                        "name" : "admin",
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                        "sizeOnDisk" : 151552,
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                        "empty" : false
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               },
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               {
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                        "name" : "config",
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                        "sizeOnDisk" : 36864,
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                        "empty" : false
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               },
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               {
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                        "name" : "local",
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                        "sizeOnDisk" : 73728,
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                        "empty" : false
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               },
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               {
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                        "name" : "test",
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                        "sizeOnDisk" : 8192,
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                        "empty" : false
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               }
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      ],
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      "totalSize" : 270336,
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      "ok" : 1
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}
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> exit

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# Change the bindIp to '0.0.0.0':
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net:
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   port: 27017
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   bindIp: 0.0.0.0

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sudo systemctl restart mongod

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sudo ufw allow 27017/tcp

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# Replace YOUR-RPI-IP-ADDRESS with your Raspberry Pi's actual IP address:
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mongo --host 'YOUR-RPI-IP-ADDRESS'