Jason Brooks jasonbrooks

KubeVirt Quickstart

This demo will deploy KubeVirt on an existing Kubernetes (1.9 or later) or OpenShift Origin (3.9 or later) cluster. For a quick way to bring up a Kubernetes or OpenShift Origin cluster, see Minikube and Minishift.

Quickstart

Deploy KubeVirt

KubeVirt deploys as an add-on to a Kubernetes (1.9 or later) cluster, using the kubectl tool and the following manifest file:

Clone the openshift-ansible repo, check out the 3.9 branch.

# git clone https://github.com/openshift/openshift-ansible.git
# cd openshift-ansible
# git checkout release-3.9

Create an inventory, I'm calling it 2-node.yml, with contents like these, substituting your correct master and node hostnames:

Fedora Atomic Host comes bundled with a version of Docker based on this project atomic repo that moves no faster than the upstream kubernetes project can abide. This means that Fedora Atomic pretty much always ships with an older version of docker than what's available from Docker Inc.

However, through the magic of rpm-ostree package layering, you can replace that older, baked-in docker with the very latest docker-ce. Here's how:

First, grab the repo file for docker-ce.

# cd /etc/yum.repos.d/
# curl -O https://download.docker.com/linux/fedora/docker-ce.repo

How to Migrate to Fedora 27 Atomic Kubernetes in System Containers

Starting with version 27 of Fedora Atomic Host, the rpms for Kubernetes, Flannel and Etcd are no longer "baked into" the image, but are available instead as system containers.

System containers can serve as drop-in replacements for components that had been included in the Fedora Atomic image. Once installed, these components will be manageable using the same systemctl commands that apply to regular rpm-installed components.

To replace Kubernetes, Flannel and Etcd with system containers, you would run the following commands.

System containers for master nodes

Start with CentOS 7

Set up the virt-sig repo:

# cat <<EOF > /etc/yum.repos.d/virt7-container-common-candidate.repo
[virt7-container-common-candidate]
name=virt7-container-common-candidate
baseurl=http://cbs.centos.org/repos/virt7-container-common-candidate/x86_64/os/
enabled=1

	-------------------------------------------------------------- ---------------------------------------------------------------
	CentOS Linux 8 CentOS Stream 8
	abattis-cantarell-fonts-0.0.25-4.el8.noarch
	adwaita-cursor-theme-3.28.0-2.el8.noarch
	adwaita-icon-theme-3.28.0-2.el8.noarch
	atk-2.28.1-1.el8.x86_64
	at-spi2-atk-2.26.2-1.el8.x86_64
	at-spi2-core-2.28.0-1.el8.x86_64
	authselect-1.2.1-2.el8.x86_64 authselect-1.2.2-1.el8.x86_64
	authselect-libs-1.2.1-2.el8.x86_64 authselect-libs-1.2.2-1.el8.x86_64

	[kubernetes]
	name=Kubernetes
	baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
	enabled=1
	gpgcheck=1
	repo_gpgcheck=1
	gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
	exclude=kube*

	<?xml version="1.0" encoding="UTF-8"?>
	<feed xmlns="http://www.w3.org/2005/Atom">
	<title>Red Hat Open Source Community</title>
	<updated>2018-04-19T13:30:00+00:00</updated>
	<author>
	<name>Red Hat, Inc.</name>
	</author>
	<entry>
	<title>Crafting an Open Source Product Strategy</title>
	<link rel="alternate" href="http://community.redhat.com/blog/2018/04/crafting-an-open-source-product-strategy/"/>

	#version=CentOS7
	# Keyboard layouts
	keyboard 'us'
	# Reboot after installation
	reboot
	# Root password
	rootpw --iscrypted --lock locked
	# System language
	lang en_US
	user --name=none

	<?php
	// Turn on all error reporting so we can see if anything goes wrong
	ini_set('display_errors', 1);
	ini_set('display_startup_errors', 1);
	error_reporting(-1);

	// Relative path to your wp-config.php file (to connect to the database)
	require '../../wp-config.php';
	require './frontmatter.php'; // Parses YAML frontmatter - https://github.com/Modularr/YAML-FrontMatter
	require './Parsedown.php'; // Markdown parser - https://github.com/erusev/parsedown