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Simple Linux HA Clustering

Aug 16, 2009, 23:04 (0 Talkback[s])

[ 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. "

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