Install MongoDB 4.x Enterprise on Debian 9

mongo_debian_9_install.sh

#!/bin/bash

# To completely purge all remnants of Mongo (repo conf, pkgs, apt cache, DB files, pgp keys), for Debian 9 or Ubuntu 18:
#  sudo service mongod stop ; sudo apt-get purge -y mongodb-enterprise* ; sudo rm -rf /etc/apt/sources.list.d/mongodb* ; sudo rm -rf /var/lib/mongodb ; sudo apt-get clean; sudo apt-get autoclean ; sudo apt-get -y autoremove ; sudo apt-key del 9DA31620334BD75D9DCB49F368818C72E52529D4 ; sudo rm -rf /etc/mongod* ; sudo rm -rf /var/log/mongo ; sudo rm -rf /etc/apt/sources.list.d/mongodb-enterprise.list /etc/systemd/system/multi-user.target.wants/mongod.service

# Inside an LXC container, if getting "Failed to start Atop process accounting daemon." then fix with:
echo $$ >/run/atopacctd.pid
apt install -f


echo Installing MongoDB 4.x Enterprise edition...
echo 
sudo apt-get install -y gnupg2 libcurl3
sudo apt-key adv --keyserver hkps://keyserver.ubuntu.com:443 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4
echo "deb https://repo.mongodb.com/apt/debian stretch/mongodb-enterprise/4.0 main" | sudo tee /etc/apt/sources.list.d/mongodb-enterprise.list
sudo apt-get update
sudo apt-get install -y mongodb-enterprise-server mongodb-enterprise-tools mongodb-enterprise-shell
sudo systemctl enable mongod.service

# Enable auth by default, save date-stamped backup conf file
echo Enabling authentication...
sudo sed -i-`date -u|tr ' ' '_'`.bak 's/^#security:*/security:\n  authorization: enabled/' /etc/mongod.conf

sudo service mongod start
systemctl status mongod --no-pager
echo -n -e "\nChecking for a running mongod server in 5 seconds... "
sleep 5
if pgrep "mongod" 2>&1>/dev/null;  then echo -e "[OK]\n" ; else echo -e "[FAIL]\n" ; fi

# Add username to prompt in mongo shell
echo 'prompt=function(){user=db.runCommand({connectionStatus:1}).authInfo.authenticatedUsers[0];if(user){return user.user + "> "};return "> "}' > ~/.mongorc.js

_mpwd=$(head -c 32 /dev/urandom 2>&1 | sha1sum | head -c 14 )
echo [Creating user 'dba' with 'root' role on 'admin' DB with password: $_mpwd]
echo "db.createUser({user:'dba',pwd:'$_mpwd',roles:['root']})"|mongo admin
echo "Attempting to connect to admin DB as user 'dba'..."
echo show dbs|mongo -u dba -p $_mpwd localhost/admin

echo
echo To login as root dba: mongo -u dba -p $_mpwd localhost/admin

# unset _mpwd