How to install Gnome and start gui in Redhat Linux

How to install Gnome and start GUI in Redhat Linux

This article will answer the following questions: How to start GUI in Redhat Linux. GNOME is the default desktop environment on Red Hat Enterprise Linux, but only if you opt for the full installation of the operating system. Other installations don’t include any GUI by default. If you’ve chosen a minimal install but don’t want to be limited to just the command line, you can install the GNOME desktop environment in a few simple commands.

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How to open http port 80 in Redhat Linux using firewall-cmd

How to open http port 80 in Redhat Linux using firewall-cmd

This article will provide you with an information on how to open port in Redhat Linux, and more specifically we will be talking about the HTTP port 80.  firewalld is the default firewall program that comes pre-installed on Red Hat Enterprise Linux 7 and 8. By default, the firewall is turned on, meaning that a very limited number of services are able to receive incoming traffic.

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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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Disabling SELinux on CentOS 8

How to disable SELinux on CentOS 8

SELinux, which stands for Security Enhanced Linux, is an extra layer of security control built into Red Hat Enterprise Linux and its derivative Linux distributions, such as CentOS. SELinux is enabled by default on CentOS 8, and would have to be manually disabled if a user doesn’t wish to use it.

Although SELinux can protect our system through access control for programs and system services, it’s not always necessary to have it enabled. Some users may even find that it interferes with certain programs they try to install. In this guide, we’ll go over the step by step instructions to disable SELinux on CentOS 8, both temporarily or persistently across reboots.

In this tutorial you will learn:

  • How to check the status of SELinux
  • How to put SELinux in permissive mode
  • How to disable SELinux

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