In this “‘little” tutorial, I will explain how to view and analyze the space in the command line on Linux with ncdu. If you are adapted from WinDirStat or TreeSize on Windows, the ncdu utility on Linux allows you to have the “same” thing in a terminal. The first thing to do is to install …
In this tutorial, I will explain how to extend a disk’s partition and then the LVM disk. To understand what we are going to do in this tutorial, I have a virtual machine with Ubuntu Server 20.04 installed on an LVM disk, following the addition of data, I must increase the storage capacity, for that …
After seeing how to install and configure Nginx as a reverse proxy and harden security with Crowdsec, I will explain in this tutorial how to generate a Let’s Encrypt certificate. As a reminder, Let’s Encrypt is a free certification authority, which allows you to obtain SSL certificates for free. If you want to generate SSL …
In this tutorial, I will explain how to extract the certificate and the private key from a certificate in PFX format with OpenSSL. The easiest way to use OpenSSL is to use a Linux computer. 1. Copy the PFX file to your computer where OpenSSL is installed. 2. The first step will be to extract …
Here is how to display the default gateway on Ubuntu from the command line. Ubuntu 20.04 + (without net tools) Ubuntu 18.04 – (with net-tools)
After seeing how to use Nginx as a reverse proxy, I will explain in this tutorial how to configure the caching of static elements (image, css files, js ….). The use of the cache will reduce the number of HTTP requests to the Web server and therefore reduce this workload. The first step will be …
1. Install Apache2: 2. Enable Apache2 mods: 3. Modify the default virtualhost or create a new one and add: 4. Restart Apache
In this tutorial, I will explain to you how to install Docker on Ubuntu and then through a concrete example how and why to use Docker. At the time of writing this tutorial (in 2021) as SysAdmin, I was having a hard time finding a concrete use for containers including Docker (so I’ll let you …
In this tutorial, I will explain to you how to secure the network part of your web servers with Crowdsec. The tutorial is made on Ubuntu 20.04 Crowdsec overview Crowdsec is an open source tool that allows you to “secure” or rather add a layer of security to your Linux servers (soon Windows too) by …
In this tutorial, I will explain how to connect to a linux server / computer in SSH without password using a key pair (private / public). Generate the key pair with ssh-keygen To generate a pair of keys, you must have an SSH client available, it is possible to do it from Windows 10 or …