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YUM, or also known as Yellowdog Updater Modified, is a package management tool developed by Yellowdog Linux. It is the default and widely used software package manager in Fedora, RHEL, CentOS Linux systems, etc. Its primary features allow you to install, upgrade, and uninstall software packages on your devices. YUM has been a reliable tool and evolved into its next-generation version, Dandified YUM(DNF). Furthermore, you can easily access YUM through the command line, making it the preferred choice of most administrators. However, many users still need to discover and want to learn various use cases of YUM. This quick guide will briefly describe YUM in Linux and demonstrate some examples of its use. How to Use YUM in Linux You can install any new software using a simple yum install command followed by your desired package name. For example, to install the r sync utility, we would use: yum install rsync Additionally, you do not need to worry about the dependencies the new packages need because YUM takes care of it all. You can use the below-given command to update any particular package: yum update package_name Please replace ‘package_name’ with the package name you want to update. For instance, let’s update the curl utility: yum update curl Similarly you can completely remove a package from your system through the following command: yum remove package_name Again replace ‘package_name’ like shown in the above section. After executing this command, enter ‘y’ to confirm the removal of your target package and its dependencies. For example, if we have to remove the curl package installed in the previous section, we will run: yum remove curl If you want to view detailed information about a package before installing it immediately, use the yum info command. For example: yum info curl It will display information about Curl’s latest version, release, size, license, and description. You can also take a brief look at the packages installed on your system by running: yum list installed In case you are unable to recall the exact name of your desired package, use the search function as follows: yum search [specific_keyword] Just replace [specific_keyword] with your target keyword. It will show all the matching package names. A Quick Summary YUM is the default package management utility in Fedora, RHEL, CentOS, and other similar Linux distributions that the Yellowdog Linux originally developed. This guide quickly explained YUM in Linux with the help of multiple examples. Here, we demonstrated how to use YUM to install, remove, and upgrade packages on your systems. View the full article

The full form of EPEL is Extra Packages for Enterprise Linux. As the name says, it’s a package repository for enterprise Linux distributions such as RHEL, AlmaLinux, Rocky Linux, CentOS Stream, and so on. The EPEL package repositories contain packages that are available on Fedora but are not available on RHEL, CentOS Stream, and other RHEL-based Linux distributions (i.e. AlmaLinux, Rocky Linux). So, if you need to use any of the software packages that are available on Fedora Linux on RHEL, AlmaLinux, Rocky Linux, or CentOS Stream, you must enable the EPEL package repositories on your computer/server.In this article, we will show you how to install, enable, and use the EPEL repository on Red Hat Enterprise Linux (RHEL) 9, AlmaLinux 9, Rocky Linux 9, and CentOS Stream 9 Linux distributions. Topic of Contents: Installing the EPEL Repository on Red Hat Enterprise Linux (RHEL) 9 Installing the EPEL Repository on AlmaLinux 9 and Rocky Linux 9 Installing the EPEL Repository on CentOS Stream 9 Checking If the EPEL Package Repository Is Enabled on RHEL/AlmaLinux/Rocky Linux/CentOS Stream Listing All EPEL Repository Packages on RHEL/AlmaLinux/Rocky Linux/CentOS Stream 8 Searching for EPEL Repository Packages on RHEL/AlmaLinux/Rocky Linux/CentOS Stream Installing the Packages from the EPEL Repository on RHEL/AlmaLinux/Rocky Linux/CentOS Stream Listing the Installed Packages from the EPEL Repository on RHEL/AlmaLinux/Rocky Linux/CentOS Stream Disabling the EPEL Repository on RHEL 9 Disabling the EPEL Repository on AlmaLinux 9/Rocky Linux 9 Disabling the EPEL Repository on CentOS Stream 9 Enabling the EPEL Repository on RHEL 9 Enabling the EPEL Repository on AlmaLinux 9/Rocky Linux 9 Enabling the EPEL Repository on CentOS Stream 9 Uninstalling the EPEL Repository from RHEL 9/AlmaLinux 9/Rocky Linux 9 Uninstalling the EPEL Repository from CentOS Stream 9 Conclusion Installing the EPEL Repository on Red Hat Enterprise Linux (RHEL) 9 Some of the packages of the EPEL repository depend on the packages from the official RHEL 9 CodeReady-Builder repository. So, you must enable the RHEL 9 CodeReady-Builder repository before installing/enabling the EPEL repository on RHEL 9. To enable the RHEL 9 CodeReady-Builder repository, run the following command: $ sudo subscription-manager repos --enable codeready-builder-for-rhel-9-$(uname -i)-rpms The CodeReady-Builder repository should be enabled on your RHEL 9 system. To install and enable the EPEL repository on your RHEL 9 machine, run the following command: $ sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm To confirm the installation, press “Y” and then press <Enter>. The EPEL repository should be installed and enabled on your RHEL 9 system. Installing the EPEL Repository on AlmaLinux 9 and Rocky Linux 9 Some of the packages of the EPEL repository depend on the packages from the official AlmaLinux 9/Rocky Linux 9 CRB repository. So, you must enable the CRB repository before installing/enabling the EPEL repository on AlmaLinux 9/Rocky Linux 9. To enable the CRB repository on AlmaLinux 9/Rocky Linux 9, run the following command: $ sudo dnf config-manager --set-enabled crb Update the DNF package database cache with the following command: $ sudo dnf makecache To install and enable the EPEL repository on AlmaLinux 9/Rocky Linux 9, run the following command: $ sudo dnf install epel-release To confirm the installation, press “Y” and then press <Enter>. You may be asked to accept the GPG key of the AlmaLinux/Rocky Linux 9 repository. To accept the GPG key, press “Y” and then press <Enter>. The EPEL repository should be installed and enabled on your AlmaLinux/Rocky Linux 9 system. Installing the EPEL Repository on CentOS Stream 9 Some of the packages of the EPEL repository depend on packages from the official CentOS Stream 9 CRB repository. So, you must enable the CRB repository before installing/enabling the EPEL repository on CentOS Stream 9. To enable the CRB repository on CentOS Stream 9, run the following command: $ sudo dnf config-manager --set-enabled crb Update the DNF package database cache with the following command: $ sudo dnf makecache To install and enable the EPEL repository on CentOS Stream 9, run the following command: $ sudo dnf install epel-release epel-next-release To confirm the installation, press “Y” and then press <Enter>. You may be asked to accept the GPG key of the CentOS Stream 9 repository. To accept the GPG key, press “Y” and then press <Enter>. The EPEL repository should be installed and enabled on your CentOS Stream 9 system. Checking If the EPEL Package Repository Is Enabled on RHEL/AlmaLinux/Rocky Linux/CentOS Stream To check whether the EPEL package repository is enabled on RHEL 9, AlmaLinux 9, Rocky Linux 9, or CentOS Stream 9, run the following command: $ sudo dnf repolist If the EPEL repository is enabled on RHEL 9, AlmaLinux 9, and Rocky Linux 9, you should see the “epel” and “epel-cisco-openh264” repositories in the list. If the EPEL repository is enabled on CentOS Stream 9, you should see the “epel”, “epel-next”, and “epel-cisco-openh264” repositories in the list. Listing All EPEL Repository Packages on RHEL/AlmaLinux/Rocky Linux/CentOS Stream To list all the EPEL repository packages on RHEL 9, AlmaLinux/Rocky Linux 9, and CentOS Stream 9, run the following command: $ sudo dnf --repo epel list available To list all the EPEL repository packages starting with the “php” name (let’s say) on RHEL 9, AlmaLinux/Rocky Linux 9, and CentOS Stream 9, run the following command: $ sudo dnf --repo epel list available php* In the same way, you can list all the “epel-cisco-openh264” repository packages on RHEL 9, AlmaLinux/Rocky Linux 9, and CentOS Stream 9 with the following command: $ sudo dnf --repo epel-cisco-openh264 list available If you’re using the CentOS 9 Stream, you can also list all the “epel-next” repository packages with the following command: $ sudo dnf --repo epel-next list available Searching for the EPEL Repository Packages on RHEL/AlmaLinux/Rocky Linux/CentOS Stream To search for the EPEL repository packages only on RHEL 9 and AlmaLinux/Rocky Linux 9, run the following command: $ sudo dnf --repo epel --repo epel-cisco-openh264 search composer To search for EPEL repository packages only on CentOS Stream 9, run the following command: $ sudo dnf --repo epel --repo epel-cisco-openh264 --repo epel-next search node Installing the Packages from the EPEL Repository on RHEL/AlmaLinux/Rocky Linux/CentOS Stream You can install the packages from the EPEL repositories on RHEL 9, AlmaLinux/Rocky Linux 9, and CentOS Stream 9 with the usual “dnf install” command. For example, to install the “nodejs-devel” from the “epel” repository along with all the dependencies, run the following command: $ sudo dnf install nodejs-devel To confirm the installation, press “Y” and then press <Enter>. The EPEL repository package and its dependencies are being downloaded and installed on your computer/server. It takes a while to complete. You may be asked to accept the GPG key of the EPEL repository. Just press “Y” and then press <Enter> to continue. Your desired EPEL repository package should be installed. Listing the Installed Packages from the EPEL Repository on RHEL/AlmaLinux/Rocky Linux/CentOS Stream To list all the installed EPEL repository packages, run the following command: $ sudo dnf list installed | grep @epel As you can see, the “nodejs-devel” package that we installed from the EPEL repository in the earlier section is displayed. Disabling the EPEL Repository on RHEL 9 To disable the EPEL repositories (“epel” and “epel-cisco-openh264”) on RHEL 9, run the following commands: $ sudo dnf config-manager --set-disabled epel $ sudo dnf config-manager --set-disabled epel-cisco-openh264 Optionally, you can disable the “CodeReady-Builder” repository on RHEL 9 with the following command: $ sudo subscription-manager repos --disable codeready-builder-for-rhel-9-$(uname -i)-rpms The EPEL repositories and CodeReady-Builder repository should be disabled on your RHEL 9 system. $ sudo dnf repolist Disabling the EPEL Repository on AlmaLinux 9/Rocky Linux 9 To disable the EPEL repositories (“epel” and “epel-cisco-openh264”) on AlmaLinux/Rocky Linux 9, run the following commands: $ sudo dnf config-manager --set-disabled epel $ sudo dnf config-manager --set-disabled epel-cisco-openh264 Optionally, you can disable the CRB repository on AlmaLinux/Rocky Linux 9 with the following command: $ sudo dnf config-manager --set-disabled crb The EPEL repositories and CRB repository should be disabled on your AlmaLinux/Rocky Linux 9 system. $ sudo dnf repolist Disabling the EPEL Repository on CentOS Stream 9 To disable the EPEL repositories (“epel”, “epel-next”, and “epel-cisco-openh264”) on CentOS Stream 9, run the following commands: $ sudo dnf config-manager --set-disabled epel $ sudo dnf config-manager --set-disabled epel-next $ sudo dnf config-manager --set-disabled epel-cisco-openh264 Optionally, you can disable the CRB repository on CentOS Stream 9 with the following command: $ sudo dnf config-manager --set-disabled crb The EPEL repositories and CRB repository should be disabled on your CentOS Stream 9 system. $ sudo dnf repolist Enabling the EPEL Repository on RHEL 9 To re-enable the EPEL repositories on RHEL 9, enable the CodeReady-Builder repository first with the following command: $ sudo subscription-manager repos --enable codeready-builder-for-rhel-9-$(uname -i)-rpms To re-enable the EPEL repositories (“epel” and “epel-cisco-openh264”) on RHEL 9, run the following commands: $ sudo dnf config-manager --set-enabled epel $ sudo dnf config-manager --set-enabled epel-cisco-openh264 The EPEL repositories and CodeReady-Builder repository should be enabled on your RHEL 9 system. $ sudo dnf repolist Enabling the EPEL Repository on AlmaLinux 9/Rocky Linux 9 To re-enable the EPEL repositories on AlmaLinux/Rocky Linux 9, enable the CRB repository first with the following command: $ sudo dnf config-manager --set-enabled crb To re-enable the EPEL repositories (“epel” and “epel-cisco-openh264”) on RHEL 9, run the following commands: $ sudo dnf config-manager --set-enabled epel $ sudo dnf config-manager --set-enabled epel-cisco-openh264 The EPEL repositories and CRB repository should be enabled on your AlmaLinux/Rocky Linux 9 system. $ sudo dnf repolist Enabling the EPEL Repository on CentOS Stream 9 To re-enable the EPEL repositories on CentOS Stream 9, enable the CRB repository first with the following command: $ sudo dnf config-manager --set-enabled crb To re-enable the EPEL repositories (epel, epel-next, and epel-cisco-openh264) on CentOS Stream 9, run the following commands: $ sudo dnf config-manager --set-enabled epel $ sudo dnf config-manager --set-enabled epel-next $ sudo dnf config-manager --set-enabled epel-cisco-openh264 The EPEL repositories and CRB repository should be enabled on your CentOS Stream 9 system. $ sudo dnf repolist Uninstalling the EPEL Repository from RHEL 9/AlmaLinux 9/Rocky Linux 9 To remove the EPEL repositories completely from RHEL 9 or AlmaLinux/Rocky Linux 9, run the following command: $ sudo dnf remove epel-release To confirm the uninstallation, press “Y” and then press <Enter>. The EPEL repositories should be removed from your RHEL 9 or AlmaLinux/Rocky Linux 9 system. Uninstalling the EPEL Repository from CentOS Stream 9 To remove the EPEL repositories completely from CentOS Stream 9, run the following command: $ sudo dnf remove epel-release epel-next-release To confirm the uninstallation, press “Y” and then press <Enter>. The EPEL repositories should be removed from your CentOS Stream 9 system. Conclusion In this article, we showed you how to install and enable the EPEL repositories on RHEL 9, AlmaLinux 9, Rocky Linux 9, and CentOS Stream 9. We also showed you how to check if the EPEL repositories are enabled, list the EPEL repository packages, search for EPEL repository packages, and install the EPEL repository packages on RHEL 9, AlmaLinux 9, Rocky Linux 9, and CentOS Stream 9. We showed you how to list the installed packages from the EPEL repositories as well. Finally, we showed you how to disable the EPEL repositories, re-enable the EPEL repositories, and uninstall the EPEL repositories completely from RHEL 9, AlmaLinux 9, Rocky Linux 9, and CentOS Stream 9. View the full article

The post Installation of “CentOS Stream 9″ with Screenshots first appeared on Tecmint: Linux Howtos, Tutorials & Guides .When Red Had shifted CentOS from a major release structure to a rolling release, users were angry as hell but CentOS went smooth, and recently they came up with their new release of CentOS The post Installation of “CentOS Stream 9″ with Screenshots first appeared on Tecmint: Linux Howtos, Tutorials & Guides.View the full article

Odoo is an opensource all-in-one business management software that ships with a suite of various business applications for various uses such as eCommerce, project management, helpdesk, accounting, inventory, and a website builder to mention The post How to Install Odoo (Open Source ERP and CRM) on CentOS 8 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

CentOS Linux 8.2 (2004) released. It is a Linux distribution derived from RHEL (Red Hat Enterprise Linux) 8.2 source code. CentOS was created when Red Hat stopped providing RHEL free. CentOS 8.2 gives complete control of its open-source software packages and is fully customized for research needs or for running a high-performance website without the need for license fees. Let us see what's new in CentOS 8.2 (2004) and how to upgrade existing CentOS 8.1.1199 server to 8.2.2004 using the command line. The post CentOS Linux 8.2 (2004) released and here is how to upgrade it appeared first on nixCraft. View the full article

In this article, we described the step by step process to install Cloudera Manager as per industrial practices. In Part 2, we already have gone through the Cloudera Pre-requisites, make sure all the servers The post How to Install and Configure Cloudera Manager on CentOS/RHEL 7 - Part 3 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

In this series of articles, we are going to cover the entire Cloudera Hadoop Cluster Building building with Vendor and Industrial recommended best practices. Part 1: Best Practices for Deploying Hadoop Server on CentOS/RHEL The post Best Practices for Deploying Hadoop Server on CentOS/RHEL 7 - Part 1 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

There are tons of monitoring tools that are used for keeping an eye on systems performance and sending notifications in case something goes wrong. However, the installation and configuration steps involved are often tedious. The post How to Monitor Performance Of CentOS 8/7 Server Using Netdata first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

Hadoop is an open-source framework that is widely used to deal with Bigdata. Most of the Bigdata/Data Analytics projects are being built up on top of the Hadoop Eco-System. It consists of two-layer, one The post How to Install Hadoop Single Node Cluster (Pseudonode) on CentOS 7 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

The scope of this tutorial is to explain how we can edit and make changes to Network Configurations on RHEL/CentOS 8/7 from the command line only, and, more specifically how we can set up The post How to Configure Network Static IP Address on RHEL/CentOS 8/7 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

A Virtual Private Network is a technology solution used to provide privacy and security for inter-network connections. The most well-known case consists of people connecting to a remote server with traffic going through a The post How to Install and Configure OpenVPN Server in CentOS 8/7 first appeared on Tecmint: Linux Howtos, Tutorials & Guides. View the full article

CDs and DVDs are slowly becoming irrelevant, but they are still efficient data storage devices. They can store data in a large quantity for long periods of time. In this article, we will discuss the mounting process of CD-ROM on CentOS 8 step-by-step. The method we will perform in this article will also work if you want to mount an ISO file on CentOS 8 system. Step 1: Login as a Root User In case you’re not a root user or do not have Sudo privileges, please use the command below to log in as a root user: $ su You will be asked to input the root password. In case you fail to provide the password, you will not be able to mount the CD-ROM using the commands given in this article since this requires Sudo privileges. Step 2: Know the Block Device Name Now that you have logged in as a root user, you will be able to use the blkid command to look at the contents of block devices. Block devices are storage devices like CD ROMs, Hard Drives, and Floppy Disks. # blkid The output will look something like the screenshot attached below: My CD is not showing here, as I have not inserted it yet. Now, if I use the blkid command again after inserting the CD, the output will have an additional device in the list of block devices: # blkid The device in this example is named /dev/sr0. Please note the block device name you want to mount and its UUID. Step 3: Create a Mount Point Directory We need to make a new directory that will act as the mount point for your CD/DVD. Therefore, create a new directory using the mkdir command (any arbitrary directory). In this example, we will use /media/mount: # mkdir /media/mount Step 4: Mount CD/DVD Drive Now, we have everything to mount a CD/DVD on our CentOS 8 system. We will use the mount command to mount the CD/DVD on CentOS 8 Operating system: # mount /dev/sr0 /media/mount/ After mounting, you will be able to access all the files on your CD/DVD drive. You can use the ls command followed by the mount point directory of CD/DVD to check whether the operation was successful or not. # ls media/mount You can also mount your CD/DVD drive permanently. Mount CD/DVD Drive Permanently To mount a CD/DVD drive permanently, use the nano command followed by /etc/fstab to open the fstab file in the nano editor. Fstab is a system configuration file in CentOS 8 located in the /etc directory: # sudo nano /etc/fstab Add the following entry in the fstab file to mount CD/DVD Drive permanently: UUID=2021-04-28-16-51-58-26 /media/mount/ iso9660 ro,user,auto 0 0 Change the UUID and mount point according to your need. UUID stands for the universally unique identifier. Save and exit the file using the keyboard shortcut “CTRL + S” and “CTRL + X” and return to the terminal. Now, you can use the “mount” command to mount your CD/DVD drive permanently: # mount /dev/sr0 /media/mount/ That’s it, Congratulations! You have permanently mounted a CD drive. Conclusion This article has a comprehensive guide on how to mount a CD/DVD ROM on a CentOS 8 system. This method given above can be used to set up any block device on your system. View the full article