roger-skyline-1

Initiation to system and network administration

VM part

VM creation

Specifics

• Hypervisor: Virtual Machine
• Linux OS: Ubuntu 18.04 (64-bit)
• Image: ubuntu-18.04.2-live-server-amd64.iso
• Size of harddisk: 8.00GB (fixed size)
• Partition set manually to 4.2 GB

Installation

• Initiate your virtual machine.

• Choose the ubuntu iso as your disk.

• Set your name, your server name, username and password.

• Mark the Install OpenSSH Server.

• Don’t install any other server environments.

• Update and upgrade your Ubuntu OS system on root:

sudo -i

• Run:

apt-get update -y && apt-get upgrade -y

• To list all block devices, run:

lsblk

• List Partitions Under Linux sudo fdisk -l

• List packages scheduled for the update You can view the list of packages that have a newer version ready to be upgraded. For this, run the following command in Terminal: apt list --upgradeable

Dependencies

• To install all of the dependencies for the Firewall, webserver and mail run on the terminal as root:

apt-get install sudo vim ufw portsentry fail2ban apache2 mailutils -y

Network and Security Part

Configure Sudo

1. Use sudo, with the non-root user specified during install, to be able to perform operation requiring special rights.

• Login as root:

sudo -i

• Type visudo on the terminal. At # User privilege specification add:

youruser ALL=(ALL:ALL) NOPASSWD:ALL

• Check if user is added to the sudoers file:

cat /etc/sudoers

Setup a static IP

1. We don’t want you to use the DHCP service of your machine. You’ve got to configure it to have a static IP and a Netmask in \30