Initial_Setup

---- This document will guide to do initial setup process after server installation ----

To access remote server
  Install openssh 
  you can choose openssh package while server installation if not install package
  
Manage Users
  To add a new user login 
    adduser username
  To give sudo permision
    usermod -aG sudo username
  To delete a user
    deluser --remove-home username (--remove-home to delete home directory of the user)

--- Firewall setting (UFW Uncomplicated Firewall) -- block/allow incoming/outgoing connections
To check status  sudo ufw status
To enable firewall  sudo ufw enable
To disable   sudo ufw disable
To enable SSH in firewall sudo ufw allow 22  (port num for ssh is 22 u can either use ssh)
Allow Incoming SSH from Specific IP Address or Subnet sudo ufw allow from 15.15.15.0/24  to any port 22    
Allow All Incoming HTTP and HTTPS  sudo ufw allow proto tcp from any to any port 80,443
Denying Connections  sudo ufw deny http
Deleting Rules  sudo ufw delete allow http


Reference Link
https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-16-04
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-16-04
https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands