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 …
Small memo to create a user on Ubuntu and add it to the sudo group: Enter the password for the current user (sudo) if necessary, then enter the password for the new account twice and enter additional information as required. Confirm the information by pressing Enter. Now we add the user to the sudo group. …
In this tutorial dedicated to Nginx, I will explain how to configure it in order to have a reverse proxy. Before getting to the heart of the matter, I will quickly introduce you to Nginx and what a reverse proxy. For this tutorial, I used an Ubuntu 20.04 machine. Introducing Nginx Nginx is a web …