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Many Linux distributions ship with the heartbeat suite of software for setting up High Availability Linux. The Linux HA project has details and downloads for those who do not have it available for their system. This text addresses setting up a very simple HA Linux configuration using the configuration files versus a GUI or the XML definition files. 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. 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.
Many Linux distributions ship with the heartbeat suite of software for setting up High Availability Linux. The Linux HA project has details and downloads for those who do not have it available for their system. This text addresses setting up a very simple HA Linux configuration using the configuration files versus a GUI or the XML definition files. 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. 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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