Linux-HA Release 2 Tutorial

Linux-HA Release 2 Tutorial
Alan Robertson
Project Leader – Linux-HA project
alanr@ unix.sh
IB M Linux Technology C enter
-- Linux-HA Full day tutorial
Linux Kongress – September, 2006 slide 1Tutorial Overview
HA Principles
Installing Linux-HA
Basic Linux-HA configuration
Configuring Linux-HA
Sample HA Configurations
Testing Clusters
Advanced features
-- Linux-HA Full day tutorial
Linux Kongress – September, 2006 slide 2Part I
General HA principles
Architectural overview of Linux-HA
Compilation and installation of the Linux-HA
("heartbeat") software
-- Linux-HA Full day tutorial
Linux Kongress – September, 2006 slide 3What Is HA C lustering?
Putting together a group of computers which trust
each other to provide a service even when system
components fail
When one machine goes down, others take over its
work
This involves IP address takeover, service
takeover, etc.
N ew work comes to the “takeover” machine
N ot primarily designed for high-performance
-- Linux-HA Full day tutorial
Linux Kongress – September, 2006 slide 4What C an HA C lustering D o For You?
It cannot achieve 100% availability – nothing can.
HA Clustering designed to recover from single faults
It can make your outages very short
From about a second to a few minutes
It is like a M agician's (Illusionist's) trick:
When it goes well, the hand is faster than the eye
When it goes not-so-well, it can be reasonably ...