Автор выбрал фонд Electronic Frontier Foundation для получения пожертвований в рамках программы Write for DOnations. Apache и Nginx — два популярных веб-сервера с…
Port knocking is a method of hiding services behind a firewall until a specific sequence of network activity occurs. After detecting this, the firewall is dynamically reconfigured to expose the requested service for the client who completed the specific sequence of activity. In this article, we will discuss how to implement a port knocking mechanism on an Ubuntu VPS using only the tools available within the iptables package.
SSH, or secure shell, is a network protocol that provides a secure, encrypted way to communicate with and administer your servers. As SSH is the most common way of working with a FreeBSD server, you will want to familiarize yourself with the different ways that you can authenticate and log in to your server. While there are several ways of logging into a FreeBSD server, this tutorial will focus on setting up and using SSH keys for authentication.
Varnish Cache is a caching HTTP reverse proxy, or HTTP accelerator, which reduces the time it takes to serve content to a user. In this tutorial, we will cover how to use Varnish Cache 4.0 to improve the performance of your existing web server. We will also show you a way to add HTTPS support to Varnish, with Nginx performing the SSL termination.
In Part 3 of this series, we look at how Jekyll creates URLs and show how to change the pattern for an individual file or the entire site. Then we look a how to link to pages within our site and stage it for testing.
Corosync is an open source cluster engine used to implement high availability within applications. This tutorial will demonstrate how to use Corosync and Pacemaker to create a high availability (HA) infrastructure on the cloud provider with CentOS 7 servers and Reserved IPs. To facilitate the process of setting up and managing the cluster nodes, we are going to use PCS, a command line interface that interacts with both Corosync and Pacemaker.
![Erstellen eines neuen Sudo-fähigen Benutzers unter CentOS 8 [Schnellstart] — step-by-step Linux tutorial on Progressive Robot](https://www.progressiverobot.com/wp-content/uploads/2026/05/how-to-create-a-new-sudo-enabled-user-on-centos-8-quickstart-de-77238-featured.png "Erstellen eines neuen Sudo-fähigen Benutzers unter CentOS 8 [Schnellstart] 7")
Der Befehl sudo bietet ein Verfahren zur Gewährung von Administratorberechtigungen – die normalerweise nur dem root user zur Verfügung stehen – für normale Benutzer. Dieser Leitfaden zeigt Ihnen, wie Sie unter CentOS 8 einen neuen Benutzer mit sudo-Zugriff erstellen,…
Eine frühere Version dieses Tutorials wurde von Justin Ellingwood verfasst. Single Points of Failure stellen bei der Speicherung kritischer Daten ein beträchtliches Risiko dar. Während sich mit vielen Datenbanken…
TLS oder „Transport Layer Security“ – und sein Vorgänger SSL – sind Protokolle, mit denen normaler Datenverkehr in einer geschützten, verschlüsselten Hülle eingeschlossen wird. Mithilfe dieser Technologie können Server sicher Informationen an ihre Clients senden, ohne…
Push notifications let your Android application notify a user of an event even when the user is not using your app. The goal of this tutorial is to send a simple push notification to your app. We’ll use **Ubuntu 14.04** and **Python 2.7** on the server, and **Google Cloud Messaging** as the push notification service.
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