Using rdiff-backup with SSHFS Rdiff-backup is an open source backup system that performs incremental, differential backups on a wide variety of platforms. Many people use rdiff-backup on both sides of... Read more
Use One-Time Passwords for Two-Factor Authentication with SSH on Ubuntu 16.04 and Debian 8 In this guide, you’ll learn how to use one-time passwords for two-factor authentication with SSH on... Read more
Install Let's Encrypt to Create SSL Certificates Let’s Encrypt is an SSL certificate authority managed by the Internet Security Research Group (ISRG). It utilizes the Automated Certificate Management Environment (ACME)... Read more
Upgrading to Debian 8 (Jessie) Debian 8 (Jessie) is the most recent version of Debian, released in April 2015. This guide explains how to upgrade your system from Debian 7... Read more
Patching OpenSSL for the Heartbleed Vulnerability A security vulnerability in OpenSSL dubbed Heartbleed has been found. This vulnerability was only recently discovered openly, but has been “in the wild” for... Read more
How to use a GPG key for SSH authentication You may be familiar with public key authentication for Secure Shell (SSH) on your Linode. But you may not have known... Read more
Control Network Traffic with iptables iptables is an application that allows users to configure specific rules that will be enforced by the kernel’s netfilter framework. It acts as a packet... Read more
SSL Certificates with Apache on CentOS 7 This guide will show you how to enable SSL to secure websites served through Apache on CentOS or Fedora. Before You Begin This... Read more
How to Upgrade to Ubuntu 14.04 LTS Deprecated This guide has been deprecated and is no longer being maintained. Ubuntu 14.04 is a long-term support (LTS) release that will be... Read more
Configure a Firewall with Arno Iptables in Debian 5 (Lenny) Deprecated This guide has been deprecated and is no longer being maintained. Firewall software is designed to limit access to... Read more