• Open Source Software

Install Flatpak on CentOS 8 - Best Method ?

This article covers the installation steps of Flatpak on the CentOS 8 system. With Flatpak, users can easily install new packages or applications from the flathub repository in an isolated space.

Flatpak is a package management system that aims to enable  users and developers to install and manage software packages on Linux systems regardless of the Linux distribution, runtime, dependencies and the type of package management. A flatpak application runs in a sandboxed environment. This is an isolated environment that is bundled with all the dependencies, libraries and everything that is needed for the app to run smoothly. 

How to Enable Flatpak in Red Hat / CentOS / Fedora ?

For RedHat / CentOS 8 and Fedora 22 and later versions, invoke the command below to enable flatpak:

$ sudo dnf install flatpak

For earlier versions of Red Hat and CentOS use the YUM package manager:

$ sudo yum install flatpak

• Server Management Service

Check Laptop Battery Status on CentOS 8 - Best Method ?

This article covers different methods for checking the battery status on CentOS 8. The battery status and ACPI https://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface information is stored in /proc and /sys directory. Using "upower" command or "acpi" command you can get this information.

upower is a command line tool which provides an interface to enumerate power sources on the system. Execute below command in the terminal.

The upower command will show detailed information about the battery:

$ upower -i /org/freedesktop/UPower/devices/battery_BAT1

• Server Management Service

Install and Configure Monit Monitoring Server on Ubuntu 20.04 LTS - Best Method ?

This article covers how to Install Monit monitoring server on the Ubuntu 20.04 system. Monit is an open-source utility used to supervise the processes and restart the services which are configured for it and have failed. Monit supervises the processes and restarts them on failure detection. Apart from the processes, Monit can also be used to monitor CPU, RAM, Disk, File Size and trigger alerts on out-of-bound values. It also shows how to trigger alert emails using custom templates. 

Now you can easily monitor your system using this lightweight tool.

To Install Monit on Ubuntu, run the following commands:

$ sudo apt update
$ sudo apt install monit

• Open Source Software

Top 6 Best Free and Open-Source Contact Management Systems

This article covers a list of such contact managing tools which provides optimal performance in terms of storing, maintaining, and managing user's contacts and address books. EspoCRM, Zurmo, SuiteCRM, and ownCloud all offer an extensive platform that along with providing a platform for managing contacts also provides other different project management features as well.

Managing and maintaining different contacts along with their details can become a hassle if done manually. Contact Management Systems and tools seamlessly automate this process for users who then do not have to worry about any important leads, contacts that they might have written on some paper or a sticky note and stored them somewhere in their briefcases. Contact Management tools take care of that for you.

• Open Source Software

Best 5 Free and Open-Source eBook Readers

This article covers eBook software applications which are free and open-source. EBook reader applications have seen a rise in recent times. Many people have acquired the means to feed their book-reading habits via kindle, mobiles, or desktops to take their minds off from their busy work schedules and daily routines. In the rapidly advancing world, taking time to go to book shops, buying books, and then taking further time out from the packed schedules to read the books is not an option for many. Therefore, eBooks have been widely adopted by many across the globe. 

You can easily open and read eBook in a variety of formats in these software. The most commonly supported eBook formats in these software include EPUB, Mobipocket, LIT, PDF, HTML, RTF, Plain Text, Comic books, etc. These software provide all essential tools which are required to enhance the overall eBook reading experience. These tools basically include search text, page navigations, go to, zoom in/ out, single page and dual page view modes, rotate, fullscreen view, scrolling options, night view mode, etc. Additionally, you can also view Table of Content and Bookmarks in these software to navigate to specific chapter or section in an eBook.

• Server Management Service

Clear Apt Cache on Ubuntu 20.04 - Best Method ?

This article covers the best method of listing and cleaning the apt cache on your Ubuntu system. Ubuntu users can clean Apt archive cache using sudo apt-get clean and sudo apt-get autoclean commands. The apt-get is a APT package handling utility or the command-line tool for handling packages. These commands clears out the local repository. The autoclean command only removes packages and files that are no longer in use. Ubuntu users can also do the same task from Synaptic package manager. Open Synaptic, go to Settings > Preferences > File tab. Select to delete packages that are no longer in use.

To clean Apt archive cache folder on Ubuntu, run:

$ sudo apt-get update
$ sudo apt-get clean
$ sudo apt-get autoclean

• clean – clean clears out the local repository of retrieved package files. It removes everything but the lock file from /var/cache/apt/archives/ and /var/cache/apt/archives/partial/.
• autoclean – Like clean, autoclean clears out the local repository of retrieved package files. The difference is that it only removes package files that can no longer be downloaded, and are largely useless. This allows a cache to be maintained over a long period without it growing out of control. The configuration option APT::Clean-Installed will prevent installed packages from being erased if it is set to off.