Postfix: configure a mail relay (MTA) on Ubuntu
In this tutorial, I will explain to you how to install (it’s the easiest) and configure Postfix on Ubuntu as an email relay to send emails from applications, equipment …
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Linux
50 articles
How to display the list of users on Linux from the command line?
How to display the list of users on Linux from the command line? Use the command: sudo cat /etc/passwd | cut -d: -f1 to list users in the file /etc/passwd The easiest …
Ubuntu 22.04: install Docker
In this tutorial, I will show you a script to install Docker and Docker Compose on Ubuntu 22.04. Today more and more applications are available in containers with Docker, …
DUF: show available disk space on Ubuntu
In this tutorial, I will explain how to install duf to show available disk space on Ubuntu. DUF is a command line utility that allows you to view available disk space on …
UFW: delete a rule
In this tutorial, I will explain how to easily delete a firewall rule managed by UFW. UFW is a command line interface that simplifies the use of iptables rules.
Ubuntu Server: configure the time zone
In this tutorial, I will explain how to configure the time zone called timezone on Ubuntu Server. Unlike the Desktop version, when installing the server version of …
Ubuntu: add a certificate from an internal certificate authority
In this tutorial, I will show you how to add the certificate of an internal CA on an Ubuntu machine. In business, we often use an Enterprise Certification Authority, …
Ubuntu: enable the firewall and manage it with UFW
In this tutorial, I will explain how to activate the firewall on a computer with Ubuntu and manage it with UFW. UFW for Uncomplicated Firewall is a simplified Netfilter …
Ubuntu: configure systemd log size
In this tutorial, we will see how to configure the size of systemd logs on an Ubuntu distribution. By default, the logs located in the /var/log/journal folder can take …
Install Docker on Ubuntu and Debian
In this tutorial, I will walk you through how to install Docker and Docker Compose on Ubuntu and Debian. Installation of Docker and docker-compose from the official …
Ubuntu: Install a Remote Desktop Server with XRDP
In this tutorial, I will explain how to install xRDP in order to have a remote desktop server (or rather a service) on Ubuntu. The purpose of this installation is not to …
Ubuntu 20.04: add swap space
In this tutorial, I will walk you through how to add swap space on Ubuntu 20.04 and above. A swap space on Linux is a location on the disk, which allows the OS to load …