Let’s Encrypt is a service offering free SSL certificates through an automated API. The most popular Let’s Encrypt client is EFF’s Certbot. Certbot offers a variety of ways to validate your…
Cron is a time-based job scheduling daemon found in Unix-like operating systems, including Linux distributions. This guide provides an overview of how to schedule tasks using cron’s special syntax on a machine running Ubuntu 18.04. It also goes over a few shortcuts one can use to make job schedules easier to write and understand.
Foreman is an open-source tool that can help with the management of servers, by providing an easy way to interact with Puppet to automate tasks and application deployment. In this tutorial, we will show you how to install Foreman with Puppet, and start using it to manage your servers. We will use Foreman for its reporting and External Node Classifier (ENC) capabilities, to ease the management of Puppet.
Using a password manager allows you to create and keep track of complex passwords for your various accounts, which allows you to implement better security practices easier. KeePass2 is a piece of software that lets you create your own password database files for managing this information. In this guide, we’ll look at a tool called `kpcli` which will allow you to create and manipulate KeePass2 database files in a server environment from the command line.
Nessus is a Vulnerability Scanning Tool. It is an open-source, subscription-based software that scans all ports on a computer/server for known vulnerabilities and exploits and presents reports in various manners. Learn how to use it with Ubuntu 22.04.
In this tutorial you will use the NKN shell daemon and the NKN Shell Client Xterm applications to execute commands on a remote machine. To do so, you will install and configure the NKN Shell daemon on a remote machine with internet access, generate a keypair, and make your connection from a client.
Ruby on Rails uses sqlite3 as its default database, which works great in many cases, but may not be sufficient for your application. If your application requires the scalability, centralization, and control (or any other feature) that is provided by a client/server SQL database offers, this tutorial will show you how to do just that, with PostgreSQL, on Ubuntu 14.04.
Rootkits are a serious problem for any internet-facing computers. A rootkit allows an intruder to continue to access the compromised machine even after the initial point of entry has been secured. In this article, we will cover how to check your server against known rootkits using a utility called rkhunter.
In this tutorial, readers will use node-sqlite3 to create a connection with an SQLite database. Next, they’ll create a Node.js app that creates a table and insert data into the database. Finally, they’ll modify the app to use node-sqlite3 to retrieve, update, and delete data from the database.
In this article, we will see how we can install emacs in a Linux system and use it for basic text editing. Emacs is also available for graphical window managers for Linux like GNOME; however, we will only cover the “text based” version here.
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