Initial Ubuntu Server (16.04)

config_network.md

/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
    address 10.0.0.41
    netmask 255.255.255.0
    network 10.0.0.0
    broadcast 10.0.0.255
    gateway 10.0.0.1
    dns-nameservers 10.0.0.1 8.8.8.8
    dns-domain acme.com
    dns-search acme.com

Update network configs

sudo ifdown eth0
sudo ifup eth0

init_server.md

• Create new user:

adduser sammy

• Add this user to sudo group:

usermod -aG sudo sammy

• Configure SSH Key-Based Authentication:

mkdir ~/.ssh
chmod 700 ~/.ssh
touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

• Setup Firewall:

Make sure that OpenSSH is listed in the registered profiles of UFW.

sudo ufw app list

Add OpenSSH to allowed list

sudo ufw allow OpenSSH

Enable the firewall:

sudo ufw enable

Check status of the firewall:

sudo ufw status