Easily Deploy an HA cluster in Virtual Machines

The goal was to easily and quickly deploy an HA cluster in Virtual Machine to be able to test latest release and test some scenarios. This is a semi-automatic script, which means that it will stop on some steps, and it will stop on errors to give you ability to fix the problem if needed.

Videos: Presentation and a demo at Youtube (based on an old release so there will be few differences with current version)

This scripts will configure:

an host (by default KVM)
4 HA nodes ready for HA scenario

All configurations files on the host are dedicated for this cluster, which means this should not interact or destroy any other configuration (pool, net, etc...) This is possible to get multiple instance of cluster from different product/SP, its just a matter of taking care of path, variable and VM names in the configuration to avoid overlap.

Please report any bugs or improvments to: https://github.com/aginies/Deploy_HA_SLE_cluster.git

NOTE: default root password for Virtual Machine is: "a"

WARNING All guest installation will be done at the same time (3 nodes), time between install is 5 seconds)
NOTE You need an HA DVD rom and an SLE12SPX ISO DVD as source for Zypper
NOTE Host server should be a SLE or an openSUSE (will use zypper)
NOTE HA1 will be the node where ha-cluster-init will be launched
WARNING Running the script will erase all previous deployment configuration
NOTE Scripts are written in shell to simplify external contribution and modification, of course this choice lead to some technical limitation but the main advantage is to be able to deploy it quickly on any kind of product without any missing dependencies

Install / HOWTO

Clone this repository
Adjust VARS in havm.conf file (or create a link from your configuration to this link)
Prepare the host: HA_testsuite_host_conf.sh
Deploy HA VM: HA_testsuite_deploy_vm.sh
Init the cluster: HA_testsuite_init_cluster.sh
Your HA cluster is now able to run some HA scenarios

havm.conf configuration file

All variables for VM guest and Host. Most of them should not be changed.

NOTE: You should adjust path to ISO for installation. Currently this is using local or NFS ISO via a pool.

HACDROM="/var/lib/libvirt/images/SLE-12-SP2-HA-DVD-x86_64-Buildxxxx-Media1.iso"
SLECDROM="/var/lib/libvirt/images/SLE-12-SP2-Server-DVD-x86_64-Buildxxxx-Media1.iso"

If you want to specify another way to ISO (like http etc...) you maybe need to adjust install_vm() function in HA_testsuite_deploy_vm.sh script.

Scripts

HA_testsuite_host_conf.sh

Configure the host:

install virtualization tools and restart libvirtd
generate an ssh root key, and prepare a config to connect to HA nodes
pre-configure pssh (generate an /etc/hanodes_${CLUSTER})
add HA nodes in /etc/hosts
create a Virtual Network: DHCP with host/mac/name/ip for HA nodes
create an SBD pool
prepapre an image (raw) which contains autoyast file

HA_testsuite_deploy_vm.sh

This script will install all nodes with needed data

clean-up all previous data: VM definition, VM images
create an hapool to store VM images
install all HA VM (using a screen)
display information how to copy host root key to HA nodes (VM)

HA_testsuite_init_cluster.sh

Finish the nodes installation and run some tests. The ha-cluster-init script will be run on node HA1.

NOTE Use the [force] option to bypass the HA cluster check.

AutoYast files

Files used for auto-installation of HA nodes. Files are copied into a image file (havm_xml.raw) and used as a disk image under HA VM.

havm.xml

This file is the autoyast profile with Graphical interface installation.

havm_mini.xml

This file is the autoyast profile (simple without GUI/X).

functions

Contains needed functions for all scripts.

scenarios directory

This directory contains some scenarios you can run on you cluster to test it.