Server Virtualization and Cloud Management Made Simple
Describes OpenNode OS installation process using downloadable OpenNode ISO/CD image.
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There can be situations when using OpenNode OS ISO installer or doing networked PXE installs is not possible (for example in case of pre-installed dedicated server offerings) - therefor we have created an helper script in order to assist converting existing CentOS installations into OpenNode compatible hosts.
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OMS is packaged and delivered simply as a VM appliance for the OpenNode host - shortcuts for installation and registration are provided by a local OpenNode TUI Utility and takes just a couple of minutes. There is only one OpenNode Management Server VM instance needed for managing multiple OpenNode OS hosts.
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In order to simplify iptables firewall configuration we have included a Shorewall firewall package (http://www.shorewall.net) - a gateway/firewall configuration tool for GNU/Linux.
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Small example recipes howto use virt-install CLI tool for virtio enabled Windows and Linux KVM VM installs.
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This howto is about using standard virt-manager GUI tool for KVM VM management. In its current state virt-manager is not capable of fully managing OpenVZ linux containers - so it's mainly a alternative GUI tool for doing KVM VM management with OpenNode OS - and not supporting all features that OpenNode OS may have.
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LVM snapshots have been around quite a while - but their copy-on-write (COW) implementation was flawed so that in case of multiple concurrently active snapshots perfomance degraded to non-acceptable levels. Until on one nice day it all got fixed in LVM2 2.02.95 release.
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OpenNode High Availability Cluster solutions are based on Red Hat Cluster Suite (RHCS) software. In this howto we describe one of the simplest ways to setup basic HA Cluster with shared block device (SAN or iSCSI) - resulting with simple 2-node active/passive failover setup which is ment to handle physical server failure.
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If in need to migrate OpenNode OS from single disk installation (no hardware raid) to linux software raid setup (RAID1) - please use this recipe. Conversion can be done online without much interrupting server operations besides a bit reduced disk IO.
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