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Configuring Ubuntu

Ubuntu Server

Setting up a static IP

// https://linuxhint.com/setup_static_ip_address_ubuntu/
// find the network interface name - eg: "enp9s0"
ip a

sudo nano /etc/netplan/00-installer-config.yaml

network:
version: 2
ethernets:
ens33:
addresses: [192.168.1.124/24]
gateway4: 192.168.1.254
nameservers:
addresses: [1.1.1.1, 8.8.8.8]

Connecting to Server

ssh root@server_ip_address

Create a new user with admin rights

adduser username

usermod -aG sudo username

sudo reboot

Disabling Root Login and Limit login attempts(sshd_config)

sudo vim /etc/ssh/sshd_config
PermitRootLogin no
LoginGraceTime 120
# allow only 1 login attempt per connection
MaxAuthTries 1
sudo service sshd restart

System update

sudo apt-get update

sudo apt-get upgrade

Firewall

sudo ufw status

sudo ufw allow ssh

sudo ufw allow http

sudo ufw allow https

sudo ufw enable

sudo ufw status

.NET Core

wget https://packages.microsoft.com/config/ubuntu/20.10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb sudo dpkg -i packages-microsoft-prod.deb

sudo apt-get update; \ sudo apt-get install -y apt-transport-https && \ sudo apt-get update && \ sudo apt-get install -y dotnet-sdk-5.0

NginX

sudo apt-get install nginx

Laptop - Check battery status

upower -e
upower -i /org/freedesktop/UPower/devices/battery_BAT1

Laptop - Stop sleep on lid closed

sudo nano /etc/systemd/logind.conf
HandleLidSwitch=ignore
LidSwitchIgnoreInhibited=no

System status dashboard - cpu usage, memory usage, processes

htop

Ubuntu Desktop

Install SSH server

sudo apt install openssh-server

Configure Network Manager

nmcli con show
single line:
sudo nmcli con mod "Wired connection 1"
  ipv4.addresses "HOST_IP_ADDRESS/IP_NETMASK_BIT_COUNT"
  ipv4.gateway "IP_GATEWAY"
  ipv4.dns "PRIMARY_IP_DNS,SECONDARY_IP_DNS"
  ipv4.method "manual"
sudo service network-manager restart ?

Samba server

sudo apt install samba
mkdir /home/<username>/sambashare/
sudo nano /etc/samba/smb.conf

[sambashare]
    comment = Samba on Ubuntu
    path = /home/username/sambashare
    read only = no
    browsable = yes

sudo service smbd restart
sudo ufw allow samba

Power managment profiles

Get available profiles

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors

Get current profile

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Set profile

echo performance | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

Ubuntu dotnet Service

export DOTNET_ROOT=/usr/share/dotnet/
~/.bashrc file.


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