Upgrading CentOS from 7 to 8 is experimental, RedHat provides a separate tool for RHEL called leapp to upgrade from EL 7.6+ to 8, 1. Check the RedHat Subscription subscription-manager list –installed 2. If not, run the following commands to automatically assign the subscription to the system and verify the subscription. subscription-manager attach –auto subscription-manager…
RHEL Releases
RHEL 2.1 26 Mar 2002 RHEL 3 22 Oct 2003 RHEL 4 15 Feb 2005 RHEL 5 14 Mar 2007 RHEL 6 10 Nov 2010 RHEL 7 10 Jun 2014 RHEL 8 7 May 2019
CentOS 6 to 7 Upgrade
IMPORTANT NOTE: Before doing the upgrade make sure the following done. Disable SElinux Remove unnecessary repositories mkdir /etc/yum.repos.d/backups mv /etc/yum.repos.d/Centos* /etc/yum.repos.d/backups Take a recent backup if required 1. Update your system to latest Centos 6 version – yum upgrade -y 2. Reboot your system – reboot cat /etc/redhat-release CentOS release 6.10 (Final) uname -r 2.6.32-754.23.1.el6.x86_64…
KVM Administration
About There are several tools to manage KVM.Here we use virsh commands. virsh stands for VIrtual SHell Help The post helps you to refer the most used admin commands which we use daily. Always you can get all details by help command virsh –help Basic Operations virsh list – List only running guests virsh list…
KVM (Kernel-based Virtual Machine)
What This is the virtualization module added to Linux kernel to function as a hypervisor. KVM requires a processor with hardware virtualization extensions, such as Intel VT or AMD-V A hypervisor is a software layer installed on the physical hardware that creates and runs several virtual machines (VMs). History Avi Kivity started the development of…