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README-CentOS8_setup.md

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Unattended setup CentOS8 on KVM

This procedure will describe how to quickly setup CentOS8 with a static ip on a KVM host using kickstart.

Requirements

This procedure requires a working kvm setup on Fedora32.

CentOS8 ISO

Download the latest CentOS8 iso and store it in /var/lib/libvirt/imagesredhat

Change the url to a mirror near you. Find out which one here CentOS mirrorlist

Issue the following command

sudo curl -sLo /var/lib/libvirt/images/CentOS-8.2.2004-x86_64-dvd1.iso http://mirror.oxilion.nl/centos/8.2.2004/isos/x86_64/CentOS-8.2.2004-x86_64-dvd1.iso

Kickstart ISO

Generate The kickstart iso

sudo genisoimage -output /var/lib/libvirt/images/centos-ks.iso -volid OEMDRV -joliet -rock /path/to/ks.cfg

This kickstart configures centos8 with the following

  • minimal install + python3
  • fqdn: ipa01.linux.lab
  • ip: 192.168.122.2
  • netmask: 255.255.255.0
  • gw: 192.168.122.1
  • dns: 192.168.122.1
  • root_passwd: redhat

KVM sda image

Create a sparse qcow2 image file on the command line for use by the linux guest.

As root issue the next command.

sudo qemu-img create -f qcow2 -o preallocation=metadata /var/lib/libvirt/images/ipa01_linux_lab_sda.qcow2 20G

Define KVM guest

As root issue the command

sudo virsh define --file /path/to/kvm_centos8.xml

This will result in a guest vm with 2 SATA cdroms attached.\

The first has the CentOS-8.2.2004-x86_64-dvd1.iso iso as source.
The second has the centos-ks.iso as source.

Start guest vm

Start the vm and wait a couple minutes for it to finish.

sudo virsh start --domain ipa01.linux.lab

When you start the centos vm the installation media will wait in the boot menu for a short while.

You have the following options to choose from

  • Do nothing
    after a short while the iso will be checked
    and the unattended install will proceed automatically after it is done.
  • Press enter
    after which the iso will be checked
    and the unattended install will proceed automatically after it is done.
  • Select the installation option and press enter
    and the unattended install will start.

Post Installation

All cdrom devices can be removed as they are no longer needed.