Identifying the CentOS Release version

How to check CentOS version

There are several ways on how to check what version of CentOS is running on your system. The simplest way to check for the CentOS version number is to execute the cat /etc/centos-release command. Identifying the accurate CentOS version may be required to help you or your support team to troubleshoot your CentOS system.

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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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Using a custom Red Hat repository - in this case from a Red Hat DVD

Creating a Redhat package repository

If your Red Hat server is not connected to the official RHN repositories, you will need to configure your own private repository which you can later use to install packages. The procedure of creating a Red Hat Linux repository is quite a simple task. In this article, we will show you how to create a local file Red Hat repository as well as a remote HTTP repository.

In this tutorial you will learn:

  • How to use official Red Hat DVD as repository
  • How to create a local file Red Hat repository
  • How to create a remote HTTP Red Hat repository

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How to create a custom rpm repository on Linux

Rpm is the acronym of RPM Package Manager: it is the low-level package manager in use in all the Red Hat family of distributions, such as Fedora and Red Hat Enterprise Linux.

An rpm package is a package containing software that is meant to be installed using this package management system, and rpm packages are usually distributed via software repositories. In this tutorial we learn how to create a custom rpm repository and how to configure our distribution to use it as a software source.

In this tutorial you will learn:

  • How to create an rpm repository
  • How to use the repository as a software source

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Setting up a MySQL database and user on AlmaLinux

How to install MySQL on AlmaLinux

In this guide, we will show you how to install MySQL on AlmaLinux. There are two separate packages for this on AlmaLinux, depending on what you need to do. You can either install the MySQL client package, which is used to connect to MySQL servers, or install the MySQL server software, which can be used to host your own databases. We’ll cover both below.

After installing a MySQL server, we’ll also go over the first steps you’ll need to get started with hosting a database, which includes making a username and password, creating a database, and granting user permissions on that database. AlmaLinux is a good Linux distro for hosting MySQL, whether you’ve freshly installed AlmaLinux or migrated from CentOS to AlmaLinux.

In this tutorial you will learn:

  • Install MySQL Client on AlmaLinux
  • Install MySQL Server on AlmaLinux
  • How to setup a MySQL database
Setting up a MySQL database and user on AlmaLinux

Setting up a MySQL database and user on AlmaLinux

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Red Hat Enterprise Linux

Oracle Linux vs Red Hat (RHEL)

Oracle Linux and Red Hat Enterprise Linux (RHEL) are well-known Linux distributions, often used in the business world. Each distro has their own pros and cons, differences, and similarities to the other.

In this guide, we’ll be comparing the two distributions across a few key areas and giving a brief review of both distros. Read on to learn more about Oracle Linux and RHEL and how they compare. By the end of this article, you’ll be armed with enough information to choose the best distro for your needs.

In this tutorial you will learn:

  • Oracle Linux and RHEL background information
  • Oracle Linux and RHEL similarities and differences
  • Which distro should I use, Oracle Linux or RHEL?

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Enabling collaboration with setgid directory

Create and configure setgid directories for collaboration – RHCSA Objective Preparation

GNU/Linux filesystem permissions and rights are the basis of the system’s security, and one of it’s principles is the clear separation of rights to files and folders. In a heavily multiuser environment, such as a school’s server, file rights prevent a user by default to accidentally delete or overwrite another’s documents. However, there are use cases where multiple users need to access (read, write, and even delete) other user’s files – such may be the case in the above mentioned school server, where students work on the same project. In this section of RHCSA exam preparation we will learn how to create an environment for such collaboration, using the setgid (set groupID) technique. Note that while we perform these steps on a recent operating system, the setgid isn’t a new thing, and you will find it in any and all distributions.

In this tutorial you will learn:

  • How to add users to a supplementary group
  • How to use set-GID on a directory
  • How to check proper ownership within the set-GID directory
  • How to use the special directory as a member of the group

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Test apache httpd installation - rhel 7

Setting up LAMP ( Linux,Apache,MariaDB,PHP) stack on Redhat 7 Linux

This tutorial will show how to setup a basing LAMP environment on RHEL7. This guide is logically split into three parts:

  • Installation of Apache Webserver
  • Installation of PHP support
  • Installation of MariaDB database

Each section will guide you step by step and will also provide simple tests to test each above step.

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