Certbot is part of the Let’s Encrypt family. You’re issuing your Let’s Encrypt SSL certificates through certbot. Certbot is software that you should keep track of during system maintenance. This tutorial shows you how to display the Certbot version number. {{outline}} Show Certbot Version on Ubuntu/Debian …

Occasionally you need to shut down or reboot your Linux servers. The Linux operating system comes with the built-in shutdown command. This command allows you to power off or reboot a computer. This tutorial shows you how to shut down or reboot a Linux machine. {{outline}} Shutdown Your Ubuntu/Debian …

In Linux, you can display a list of files and directories using the ls command. By default, ls prints the contents of a directory (files and folders) alphabetically in a column-like layout: $ ls CHANGELOG.md README.md lerna-debug.log node_modules package.json test LICENSE jest.config.js lerna.json …

Linux comes with the which command to locate a given executable. Executables are commands you type into your terminal, like git, node, touch, or vim. Sometimes, you want to find the location of an executable on your filesystem. That’s where the which command comes handy. Read on to find …

Recently, I provisioned a new Elasticsearch cluster. The installation process on Ubuntu used the apt package manager and everything looked good. I started the application as soon as Elasticsearch booted and was ready for connections. The app connected to the database, everything looked good. Yet, the Elastic SDK failed while …

Ubuntu/Debian — How to Unzip Into a Folder You may download a ZIP file from the Internet and need to unzip it to a specific directory. On Unix and Linux, you can stay in the command line and unzip a packaged ZIP file to the folder of your choice! {{outline} …

Cron jobs are a nice way to automatically run scheduled tasks. The cron service in Linux systems is the typical approach when scheduling commands on the operating system. {{outline}} Testing a Cron Job Recently the certbot from Let’s Encrypt didn’t automatically renew SSL certificates anymore. We used a …

Running an Ubuntu or Debian operating system on your servers comes with a long lifetime. You won’t switch servers and migrate your applications that often. You’ll maintain your system now and then and update installed packages to keep your system secure. Recently, while maintaining the software on our …