When you start a new server, there are a few steps that you should take every time to add some basic security and give you a solid foundation. In this guide, we'll walk you through the basic steps necessary to hit th...

SSH keys provide a more secure way of logging into a virtual private server with SSH than using a password alone. With SSH keys, users can log into a server without a password. This tutorial explains how to generate, ...

When you first create a new Ubuntu 18.04 server, there are a few configuration steps that you should take early on as part of the basic setup. This will increase the security and usability of your server and will give...

When you start a new server, there are a few steps that you should take every time to add some basic security and set a solid foundation. In this guide, we'll walk you through the basic steps necessary to hit the grou...

In this tutorial, we will show you how to use Let's Encrypt to obtain a free SSL certificate and use it with Nginx on Ubuntu 16.04. We will also show you how to automatically renew your SSL certificate. If you're runn...

Iptables is a firewall that plays an essential role in network security for most Linux systems. While many iptables tutorials will teach you how to create firewall rules to secure your server, this one will focus on a...

SSH is an important tool used for administering remote Linux and Unix-like computers. In this guide, we will discuss the basic usage of this utility and how to configure your SSH environment.

This tutorial will show you how to set up a free TLS/SSL certificate from Let’s Encrypt on a Ubuntu 16.04 server running Apache as web server. TLS certificates are used within web servers to encrypt the traffic betwee...

OAuth 2 is an authorization framework that enables applications to obtain limited access to user accounts on an HTTP service, such as Facebook, GitHub, and DigitalOcean. It works by delegating user authentication to t...

Firewalld is a complete firewall solution available by default on CentOS and Fedora servers. In this guide, we will cover how to set up a basic firewall for your server and show you the basics of managing the firewall...

SSH-key-based authentication provides a more secure alternative to password-based authentication. In this tutorial we'll learn how to set up SSH key-based authentication on an Ubuntu 16.04 installation.

Let's Encrypt is a Certificate Authority (CA) that provides an easy way to obtain and install free TLS/SSL certificates, thereby enabling encrypted HTTPS on web servers. In this tutorial, you will use Certbot to obtai...

OpenVPN is a full-featured, open-source Secure Socket Layer (SSL) VPN solution that accommodates a wide range of configurations. In this tutorial, you will set up an OpenVPN server on an Ubuntu 18.04 server and then c...

SSH, or secure shell, is the most common way of administering remote Linux servers. Although the daemon allows password-based authentication, exposing a password-protected account to the network can open up your serv...

In this tutorial, we will show you how to use Let's Encrypt to obtain a free SSL certificate and use it with Nginx on Ubuntu 14.04. We will also show you how to automatically renew your SSL certificate. If you're runn...

Learn how to setup a firewall with UFW on an Ubuntu / Debian cloud server.

When setting up infrastructure, getting your applications up and running will often be your primary concern. However, making your applications to function correctly without addressing the security needs of your infras...

UFW is a firewall configuration tool for iptables that is included with Ubuntu by default. This cheat sheet-style guide provides a quick reference to UFW commands that will create iptables firewall rules are useful in...

This guide provides a quick reference to OpenSSL commands that are useful in common, everyday scenarios. Similar to a cheat sheet for OpenSSL commands.

This tutorial will show you how to set up a firewall with UFW on Ubuntu 18.04.