How to Setup Nodejs Mongodb in Production server on Ubuntu 18.04 in AWS, GCP, Azure, Digital Ocean Cloud Instance or Locally

#!/usr/bin/env bash# Steps to write and execute a script# Open the terminal. Go to the directory where you want to create your script.# Create a file with . sh extension.# Write the script in the file using an editor.# Make the script executable with command chmod +x <fileName>.# Run the script using ./<fileName>.echo "----------------------  Adding a New User to the System 'Sammy'----------------------"adduser sammy# enter all the prompted info# Step 3  Adding the User to the sudo Groupusermod -aG sudo sammy# Testing sudo Accesssu - sammysudo ls -la /rootecho "----------------------  GIT----------------------"# install curlsudo apt install curl -y# install gitsudo apt-get install -y gitecho "----------------------  NODE & NPM----------------------"## You may also need development tools to build native addons:sudo apt-get install gcc g++ make -ywget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bashnvm ls-remotenvm install 14nvm alias default  14.15.0# add nodejs 14 ppa (personal package archive) from nodesource# curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -# install nodejs and npm# sudo apt-get install -y nodejsecho "----------------------  MONGODB----------------------"# import mongodb 4.0 public gpg keysudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4# create the /etc/apt/sources.list.d/mongodb-org-4.0.list file for mongodbecho "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.0.list# reload local package databasesudo apt-get update# install the latest version of mongodbsudo apt-get install -y mongodb-org# start mongodbsudo systemctl start mongod# stop mongodbsudo systemctl stop mongod# Make a directory as root usersudo mkdir -p /data/db# Provide access to the directorysudo chown -R $USER /data/db# set mongodb to start automatically on system startupsudo systemctl enable mongod# stop mongodb to start automatically on system startupsudo systemctl disable mongod# install local replication-set driver for nodejssudo npm install --unsafe-perm --verbose -g run-rs -f# start mongodb replica set# run-rs --mongod --keep --shell --dbpath /home/user/data"# start mongod as a background process mongod  --fork  --syslogecho "----------------------  PM2----------------------"# install pm2 with npmnpm install -g pm2# set pm2 to start automatically on system startuppm2 startup systemd# make current user the owner of the pm2 log home dirsudo chown -R $(whoami):$(whoami) /home/ubuntu/.pm2# create a shell script replica.sh$ nano replica.sh    #!/bin/bash    run-rs --mongod --keep --shell --dbpath /data/db$ pm2 run replica.shecho "----------------------  NGINX----------------------"# install nginxsudo apt-get install -y nginx# You can make the currrent $USER the owner of that directorysudo chown -R $(whoami):$(whoami) /var/www# set the appropriate permissionschmod 755 -R /var/wwwecho "----------------------  UFW (FIREWALL)----------------------"# allow ssh connections through firewall# sudo ufw allow OpenSSH# allow http & https through firewall# sudo ufw allow 'Nginx Full'# enable firewall# sudo ufw --force enableecho "----------------------  NETWORK TESTING TOOL----------------------"# curl toolsudo apt  install httpie -ysudo apt updatesudo apt install redis-server -y# # comment out `supervised no` and set `supervised systemd`sudo nano /etc/redis/redis.conf# > supervised systemd# restart redis serversudo systemctl restart redis.serviceecho "----------------------  SET UP LETS-ENCRYPT----------------------"# Instal CertBotcurl -o- https://raw.githubusercontent.com/vinyll/certbot-install/master/install.sh | bash# Open the server block file for your domain using nano or your favorite text editor:sudo nano /etc/nginx/sites-available/example.com#server_name example.com www.example.com;# test and restart nginxsudo nginx -tsudo systemctl reload nginx# create the nginx default configurationnano  default # paste the content below## start  # website serverserver {    server_name example.com www.example.com;    root /var/www/html/web/build;    index index.html;    location / {        try_files $uri$args $uri$args/ /index.html;    }}# admin console serverserver {    server_name admin.example.com;    root /var/www/html/admin/dist;    index index.html;    location / {        try_files $uri$args $uri$args/ /index.html;    }}# demo or documentation serverserver {    server_name developers.example.com;    root /var/www/html/backend/doc;    index index.html;    location / {        try_files $uri$args $uri$args/ /index.html;    }}# backend api serverserver {    server_name api.example.com;    proxy_set_header Host $host;    proxy_set_header X-Forwarded-For $remote_addr;    location / {        proxy_pass http://localhost:5000;        proxy_http_version 1.1;        proxy_set_header Upgrade $http_upgrade;        proxy_set_header Connection 'upgrade';        proxy_set_header Host $host;        proxy_cache_bypass $http_upgrade;        proxy_connect_timeout       600;        proxy_send_timeout          600;        proxy_read_timeout          600;        send_timeout                600;    }}## end sudo rm  /etc/nginx/sites-available/defaultsudo mv default  /etc/nginx/sites-available/default# Set up Certbot to obtain SSL certificatessudo certbot --nginx -d example.com -d www.example.com  -d api.example.com  -d dev.example.com   -d developers.example.com -d admin.example.com# To test the renewal process, you can do a dry run with certbot:sudo certbot renew --dry-run