How to Resolve “Warning: RPMDB altered outside of yum” CentOS 7

The message “Warning: RPMDB altered outside of yum” displayed when the yum command is not finished completely or interrupted while running any yum transaction and rpmdb does not completed the rpm database editing.

How to Configure 2 Nodes High Availability Cluster with Pacemaker and Corosync on CentOS 7

High Availability (HA) Cluster provides the continued availability of services without failure for a long period of time. If one of the cluster nodes fails, the pacemaker service will start the services on another node. Pacemaker and Corosync are open source and widely used software for service high availability in production environments.

How to Enable EL repository in CentOS 7

The EL repository is an additional RPM repository for Enterprise Linux. ELRepo supports Red Hat Enterprise Linux and its derivatives Scientific Linux, CentOS and its other distributions that provides hardware related file system drivers, graphics drivers, network drivers, sound drivers, webcam and video driver’s related packages.

How to configure EPEL repository on CentOS 8

The EPEL repository is an additional package repository that provides useful software packages that are not included in the official CentOS 8 repositories and easy access to install packages for commonly used software.

How to resolve wget: command not found in CentOS 8

wget command: It is a command-line utility and used to downloads files over a network. wget is a free utility to download files and available most of the Linux distributions.

How to Install CentOS 8.0 Minimal Step by Step

The CentOS Project is recently released CentOS 8.0 for Linux users. It is a new community version of RHEL 8 and has many new features such as multiple versions of packages are available in CentOS 8 Base repository and App Stream for the additional user space applications.

How to change Hardware Clock date and time Using hwclock

The hardware clock also known as BIOS clock. It is independent operating system clock and it works even when shut down the system. hwclock utility is used to check current time of hardware clock and adjust the hardware clock time.

How to Enable Software Collections (SCL) yum repository on CentOS 7

The Software Collection is an additional package repository that allow users to easily and safely install most recent versions of applications and configure online environments without compromising the performance of the existing system. It is reliable, community edition and provides useful software packages that are not included in the official CentOS 7 default repositories.