Virtual Machines menu missing in the Cockpit interface? This article will help you to fix the issue. Recently, I started to use Cockpit to manage CentOS servers as it provides a web-based graphical interface that is easy to use. It is intended for everyone, especially those who are new to…

This tutorial is a step-by-step guide to install KVM on CentOS 8 / CentOS 7 Linux. KVM (Kernel-based Virtual Machine) is a virtualization solution, that helps to turn your server into a hypervisor and run multiple virtual machines. This tutorial also explains how to set up and manage a virtualized…

Earlier I had written about CentOS 8 error: Failed to download metadata for repo  “AppStream” and followed by converting CentOS 8 to CentOS Stream. Finally, I had suggested migrating CentOS 8 to Rocky Linux, AlmaLinux, or Oracle Linux that provides Long Term Support (LTS). In this tutorial, we shall learn to…

Ansible is an open-source IT automation tool used to automate configuration management, provisioning, application deployment, orchestration, and many other IT processes without the need to install any agents on the client nodes. It relies on SSH protocol to communicate with the client nodes. Ansible provides ease of use and installation…

In this guide, you will learn to install Apache (most widely used webserver) on CentOS 8 Linux server. How to install Apache on CentOS 8 Step 1: Update software repository # dnf update Step 2: Verify the repo containing Apache # dnf module list httpd CentOS Linux 8 – AppStream…

I’m running git v1.8 on my CentOS 7.8 machine. I would like to upgrade git to the latest version. The command yum install git always tells that v1.8 is already installed and I am unable to proceed further. Below is the snapshot of my server details. [root@loyalty ~]# yum install…

After upgrading my CentOS 7 to CentOS 8, when tried to start the firewalld service, encountered the error: Exception DBusException: org.freedesktop.DBus.Error.AccessDenied, however works perfectly normal with a fresh install of CentOS 8!. Below is the complete error: [root@upgrade-centos ~]# systemctl status firewalld ● firewalld.service – firewalld – dynamic firewall daemon…

This tutorial will help you to learn how to disable firewall on CentOS 8 and many other service activities like: How to enable firewall on CentOS 8 How to check the status of firewall How to stop firewall on CentOS 8 How to start firewall on CentOS 8 However, iptables…

This tutorial will explain how to install PHP 8 on CentOS 8 Linux and its dependent packages. Step 1: Enableremi-release-8.rpm Configure the Remi repository for installing PHP 8 on CentOS 8 # dnf install https://rpms.remirepo.net/enterprise/remi-release-8.rpm Step 2: Enable EPEL repository # dnf install epel-release Step 3: Find the current enabled…

Recently I had explored upgrading CentOS 7 to CentOS 8 and during the process, I encountered the error: Failed to synchronize cache for repo ‘appstream’. Below is the complete error: Failed to synchronize cache for repo ‘baseos’, ignoring this repo. Failed to synchronize cache for repo ‘appstream’, ignoring this repo….

This tutorial will guide you step-by-step to upgrade CentOS 7 to Centos 8. Step 1:  Boot up any CentOS 7 system [root@upgrade-centos ~]# more /etc/redhat-release CentOS Linux release 7.2.1511 (Core) Step 2: Update to the latest CentOS 7 release [root@upgrade-centos ~]# yum update –y [root@upgrade-centos ~]# more /etc/redhat-release CentOS Linux…

Recently I started a CentOS 8 VM on my OpenStack setup. When trying to configure firewall rules using firewall-cmd,  encountered the error “firewall-cmd: command not found“. Below is the complete error: # firewall-cmd bash: firewall-cmd: command not found How to fix firewall-cmd: command not found on CentOS 8 To solve…

In 2017, we wrote an article on migrating to Let’s Encrypt from StarSSL and also you’ll see a number of articles written on Let’s Encrypt issues and solutions. Here again, we are writing how to Install the Certbot package which is a script that automatically requests certificates from LetsEncrypt. In…

As you all know, CentOS 8 has reached its EOL on 31st Dec 2021, it’s time to upgrade your CentOS 8 Linux to CentOS Stream, which is the future of the CentOS Project. CentOS has shifted its focus from CentOS to CentOS stream, which is a midstream between Fedora and…

I recently started using CentOS 8 on my server and I couldn’t see the package xclip installed on CentOS 8 (below is the command not found error message). This article will help you to install xclip on CentOS 8. # xclip -bash: xclip: command not found How to install xclip…

I had installed a minimalist CentOS 8 on one of my servers. Installation went successful, however, when I tried to update the system using yum update I see this error message: Failed to download metadata for repo. Below is the complete error. [root@autocontroller ~]# yum update CentOS-8 – AppStream 70…

I have written many articles on sudoers in the past such as best practices and solved many errors related to the sudoers files. This time, one of my readers requested me to verify his sudoers file? Below is the users’ sudoers file. This article explains how to check sudoers syntax….

On 5th October 2021, Microsoft rolled out Windows 11 as a free upgrade to most Windows 10 users. I was skeptical about the upgrade (because of various changes such as revamped right-click context menu, missing ribbon bar in the explorer, and missing task manager menu from the taskbar right-click) and…

I hope you have read my Openstack API articles to provide access to Openstack services through REST APIs. When my client tried to access a glance image for his VM creation, they ended up with an error: Not authorized for image a62daa1b-2fba-47ad-8008-538cd88f306c. The complete error from the glance api.log is…