Installing Docker on CentOS 9 Stream

Installing Docker on CentOS 9 Stream

Docker has become a crucial tool for developers, enabling them to package applications into containers, which are standalone executable packages containing everything needed to run a piece of software, including the code, runtime, libraries, environment variables, and config files. This article will walk you through the process of installing Docker on CentOS 9 Stream, breaking down each step to ensure a smooth and successful installation.

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CentOS Package Management: Top 20 Command Examples for System Administrators

CentOS Package Management: Top 20 Command Examples for System Administrators

Managing packages is a crucial aspect of system administration and development in Linux environments, such as CentOS. This guide is designed to introduce you to the top 20 most common examples of package manager usage on CentOS. Whether you are a new system administrator or a seasoned developer, understanding these examples will help you effectively manage your CentOS system’s packages, ensuring it runs smoothly and securely.

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Identifying the CentOS Release version

How to check CentOS version

The purpose of this tutorial is to show how to check the CentOS version of your Linux system. It’s possible to do this from either command line or GUI, so you can use whichever method is more convenient for you. Classic CentOS is nearing its end of life and will be replaced by CentOS Stream. Knowing your CentOS version will give you some insight into how long your system will continue to be supported.

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How to install Flatpak on CentOS

How to install Flatpak on CentOS

Flatpak is a package manager that is available for installation on CentOS Linux and all other major Linux distros. Flatpak offers CentOS users an alternative to the official repos and default dnf package manager as a source of software installation. Many applications available in Flatpak currently do not reside in official CentOS repos, making this a big benefit of installing Flatpak.

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How to auto login on CentOS

How to auto login on CentOS

The purpose of this tutorial is to enable auto login on GNOME GUI and the KDE Plasma desktop environment on CentOS Linux system. If you are using CentOS and getting tired of needing to provide your password every time your computer boots up, or goes back to the lock screen, then enabling auto login will save you some time and frustration.

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How to query packages information with the rpm package manager

RPM is the recursive acronym for RPM Package Manager: it is the default low level package manager in some of the most famous and most used Linux distributions, such as Fedora, Red Hat Enterprise Linux, CentOS, OpenSUSE and their derivatives. The software, as you can expect, is free and open source; when invoked with the -q option it can be used to query packages to retrieve specific information, such as dependencies, recommendations, files etc. In this tutorial we learn how to perform such queries.

In this tutorial you will learn:

  • How to run rpm in “query” mode
  • How to obtain general information about a package
  • How to read a package changelog
  • How to list the files provided by a package
  • How to list the scripts used by a package
  • How to list a package dependencies and recommendations
  • How to list packages rendered obsolete by an rpm
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How to query packages information with the rpm package manager

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How to work with dnf package groups

How to work with dnf package groups

Dnf is the default high-level package manager in the Red Hat family of distributions, which includes Fedora, Red Hat Enterprise Linux and all its clones. It is the successor of Yum, and indeed using the yum command in recent versions of the distributions mentioned above, is just another way to call dnf. Dnf has a lot of nice features
and plugins which help us install, update and remove software packaged in the “.rpm” format. In this tutorial we explore dnf package groups and learn how to handle them.

In this tutorial you will learn:

  • What is a package group
  • How to get information about a package group
  • How to list all available package groups
  • How to install, upgrade and remove a package group
How to work with dnf package groups

How to work with dnf package groups

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The chrony NTP server source list on AlmaLinux

How to configure NTP server and client on AlmaLinux

NTP stands for Network Time Protocol and is used for clock synchronization across multiple computers. An NTP server is responsible for keeping a set of computers in sync with each other. On a local network, the server should be able to keep all client systems to within a single millisecond of each other.

Such a configuration would be necessary if, for example, the systems needed to start or stop a task in unison at a precise time. In this article, we’ll show you how to configure an NTP server on AlmaLinux and how to configure a client system to sync its system time with said server. This can be done from a fresh AlmaLinux installation or on a system that has migrated from CentOS to AlmaLinux.

In this tutorial you will learn:

  • How to install and configure chrony NTP server
  • How to open firewall to incoming NTP requests
  • How to connect to an NTP server from a client machine
The chrony NTP server source list on AlmaLinux

The chrony NTP server source list on AlmaLinux

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