Mongodb install steps inside LXD container on rpi4

mongodb-lxd-container.sh

#!/bin/sh

# MongoDB official community ed discontinued support of raspberry pi after mongod 4.4
# We tried their steps from https://www.mongodb.com/docs/v4.4/tutorial/install-mongodb-on-ubuntu/
# and the result is core dump; didn't matter for 20.04/18.04 images, all core dumps.
# Lesson learned, just use the old apt package provided by Ubuntu.

lxc launch ubuntu:20.04 mdb
lxc exec mdb -- bash

#apt update
#apt upgrade
#apt install mongodb -y
#systemctl status mongodb

## some steps differ from https://www.digitalocean.com/community/tutorials/how-to-secure-mongodb-on-ubuntu-20-04
#mongo
> use admin
> db.createUser({user: "ADMIN", pwd: "ADMIN", roles: [ { role: "userAdminAnyDatabase", db: "admin" }, "readWriteAnyDatabase" ]})
> exit

#vi /etc/mongod.conf
## uncomment the line with "auth=true" to enable authentication

#systemctl restart mongodb
#mongo -u ADMIN -p --authenticationDatabase admin

## type ADMIN for the password when prompted
> db = db.getSiblingDB('DV-DB');
> db.createUser({ user: 'DV-TESTER', pwd: 'DV-PASSWORD', roles: [{ role: 'readWrite', db: 'DV-DB' }] })
> db.createCollection('enrollment');
> exit

## this login can be used with URI "mongodb://DV-TESTER:DV-PASSWORD@127.0.0.1:27017/DV-DB"

## to allow pass-thru connections from the host os to the container see 
#sudo lxc config device add web mdbport27017 proxy listen=tcp:0.0.0.0:27017 connect=tcp:127.0.0.1:27017

## if the machine has LAN DHCP IP assigned 10.11.12.13
## then the URI becomes "mongodb://DV-TESTER:DV-PASSWORD@10.11.12.13:27017/DV-DB"
## and should be available to the LAN clients without firewall changes

see linode tutorial for the lxc config device proxy command -- https://www.linode.com/docs/guides/beginners-guide-to-lxd/