Simple Linux HA Clustering

[ Thanks to Jay Fink
for this link. ]

“Setup

“The example setup will have two servers that serve up an apache
webserver. One can have many other services assigned as well and
shared data over NFS for example. For instance, if the failover was
for an apache server where htdocs was sitting on storage it could
be like so:

mass storage/NFS/iSCSI/Fibre
         |
server1:/mnt/htdocs server2:/mnt/htdocs

“Similarly a common mysql db backend could be available or even
more exotic tiered mysql dbs – basically whatever the needs are.
What Linux HA can do is using a shared IP it can host the same IP
from any server in the cluster list. For demonstration purposes,
however, the apache servers root will have an index file with the
actual hostname of the system – what should be observed is the
index file contents will change after a failover but still be
accessible via the shared IP. “

Complete
Story